Ultrasensitive detection of cadmium ions using a microcantilever-based piezoresistive sensor for groundwater

• Dinesh Rotake,
• Anand Darji and
• Nitin Kale

Beilstein J. Nanotechnol. 2020, 11, 1242–1253, doi:10.3762/bjnano.11.108

• 0.56 ng Cd(II) is 877.72 Ω. Characterization using Fourier-transform infrared spectroscopy (FTIR) FTIR is a mature technique for elemental analysis and the identification of functional groups. The FTIR results show –OH stretching in the range of 2900–3750 cm−1 and N–H bending (1350–1750 cm−1) [48][49

• ][50][51]. The FTIR analysis of a Cd(II)/DL-GC/Cys/Au/Cr coating is shown in Figure 6. The FTIR results of the Cys/Au/Cr coating show a single band at 3367 cm−1 associated to the –OH group and three bands at 1420, 1651, and 1732 cm−1 associated to the –NH2 group. After coating with ᴅʟ-glyceraldehyde

• (DL-GC/Cys/Au/Cr), the FTIR spectra show four bands at 1320, 1473, 1571, and 1647 cm−1 associated to the –NH2 group and two bands at 2922 and 3311 cm−1 associated to the –OH group. After exposure to Cd(II) two bands related to –OH disappear and only single band at 3500 cm−1 is present due Cd(II

High permittivity, breakdown strength, and energy storage density of polythiophene-encapsulated BaTiO₃ nanoparticles

• Adnanullah Khan,
• Amir Habib and
• Adeel Afzal

Beilstein J. Nanotechnol. 2020, 11, 1190–1197, doi:10.3762/bjnano.11.103

• mixture. All materials including BTO, BTO-PTh, and PTh are characterized using Fourier-transform infrared spectroscopy (Nicolet 520 FTIR spectrophotometer) and X-ray diffraction (STOE STADI P X-ray diffractometer). The morphology of BTO and BTO-PTh nanoparticles is studied using scanning electron

• Chemical structure and surface morphology of the as-prepared BTO nanoparticles, core–shell-type BTO-PTh nanoparticles, and pristine PTh are characterized and reported herein. Figure 2 shows the FTIR spectra of PTh, BTO, and BTO-PTh nanoparticles. A distinct peak at 560 cm−1 is the characteristic stretching

• the core–shell BTO-PTh nanoparticles. FTIR spectra of the as-prepared BTO nanoparticles, pristine PTh, and core–shell BTO-PTh nanoparticles. XRD patterns of the as-prepared BTO nanoparticles, pristine PTh, and core–shell BTO-PTh nanoparticles. The diffraction peaks denoted by (#) correspond to the

Gram-scale synthesis of splat-shaped Ag–TiO₂ nanocomposites for enhanced antimicrobial properties

• Mohammad Jaber,
• Asim Mushtaq,
• Kebiao Zhang,
• Jindan Wu,
• Dandan Luo,
• Zihan Yi,
• M. Zubair Iqbal and
• Xiangdong Kong

Beilstein J. Nanotechnol. 2020, 11, 1119–1125, doi:10.3762/bjnano.11.96

• obtain homogeneous Ag–TiO2 nanocomposites with a high yield. The prepared compounds were characterized by XRD, SEM, EDS, FTIR and UV–vis spectrophotometry. The cell viability upon exposure to the splat-shaped Ag–TiO2 nanocomposites was evaluated by using the Cell Counting Kit-8 assay. The antimicrobial

• spectroscopy (FTIR, Nicolet IS50) was used to measure the infrared spectra. To detect the absorption profile of the prepared samples, the UV–vis spectroscopy technique was used. In vitro cytotoxicity The Cell Counting Kit-8 (CCK-8) was purchased from Beyotime Biotechnology (Shanghai, China). Human colon

• compounds. The sample without Ag was identified as pure TiO2 nanospheres (Figure 2a). Figure 3a shows the FTIR spectrum of pure TiO2 NPs in comparison with the Ag–TiO2 nanocomposites at different Ag concentrations. The central absorption peak of pure TiO2 NPs and Ag–TiO2 nanocomposites at 3475.2, 3469.1

Uniform Fe₃O₄/Gd₂O₃-DHCA nanocubes for dual-mode magnetic resonance imaging

• Miao Qin,
• Yueyou Peng,
• Mengjie Xu,
• Hui Yan,
• Yizhu Cheng,
• Xiumei Zhang,
• Di Huang,
• Weiyi Chen and
• Yanfeng Meng

Beilstein J. Nanotechnol. 2020, 11, 1000–1009, doi:10.3762/bjnano.11.84

• (Figure 2i). Fourier-transform infrared spectroscopy (FTIR) was conducted to verify the nanocube surface modifiers before and after DHCA exchange. By comparing the FTIR spectra of FGOA and FGDA nanocubes (Figure 2i), it is possible to conclude that the two samples display distinct characteristic

• coincide with the peaks of pure Fe3O4 (asterisks) and Gd2O3 (triangles). (i) FTIR spectra of FGOA (red line) and FGDA (black line) nanocubes. (j) Field-dependent magnetization curves (M–H) of Fe3O4/Gd2O3 (black line) and Fe3O4 (red line) measured using a physical property measurement system (PPMS) at 300 K

Preparation, characterization and photocatalytic performance of heterostructured CuO–ZnO-loaded composite nanofiber membranes

• Wei Fang,
• Liang Yu and
• Lan Xu

Beilstein J. Nanotechnol. 2020, 11, 631–650, doi:10.3762/bjnano.11.50

• sample regions evaluated with SEM. The pore size distributions of CNFMs were measured using capillary flow porometry (Porometer 3G, Quantachrome Instruments, USA). All samples were circular membranes with a diameter of 25 mm and the thickness of 10 μm. FTIR spectra of CNFMs were obtained using Fourier

• -transform infrared spectroscopy (FTIR, Nicolet5700, Thermo Nicolet Company, Waltham, MA, USA), carrying out 32 scans within the wavenumber range of 400–4000 cm−1 with a resolution of 4 cm−1. X-ray diffraction (XRD) analyses were carried out using a Philips X’Pert-Pro MPD (PANalytical, Almelo & Eindhoven

• studies. FTIR and XRD analysis: FTIR was used to characterize the CNFMs with different [Cu(Ac)2/Zn(Ac)2]/[PVDF/PAN] weight ratios (Figure 7). The peaks at 879 cm−1 correspond to the asymmetric stretching vibration of –CF2– in PVDF. The peaks at 1070 and 1276 cm−1 represent the β-phase of PVDF. There was

Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties

• Marta Bartel,
• Katarzyna Markowska,
• Marcin Strawski,
• Krystyna Wolska and
• Maciej Mazur

Beilstein J. Nanotechnol. 2020, 11, 620–630, doi:10.3762/bjnano.11.49

• the particles is similar to that of non-sulfonated polystyrene beads (SEM data not shown). Thus, if shape and size of the beads are retained during the reaction, the question arises whether they have been in fact transformed into the gel-shell particles [27][28]. To answer this question FTIR

• spectroscopy has been employed. Figure 3 shows the FTIR spectrum of the sulfonated particles. The most intense mode at 1186 cm−1 with a broad shoulder is attributed to the asymmetric stretching of S=O bonds. The symmetric stretching vibrations of SO3− groups produce the band at 1041 cm−1. The peak at 834 cm−1

• that there is both sulfonated and non-sulfonated polystyrene. The peak at 699 cm−1 assigned to the out-of-plane skeleton bending vibrations of the benzene ring is correlated to the degree of sulfonation (the larger the intensity of the band, the lower the sulfonation degree). The FTIR results clearly

Soybean-derived blue photoluminescent carbon dots

• Shanshan Wang,
• Wei Sun,
• Dong-sheng Yang and
• Fuqian Yang

Beilstein J. Nanotechnol. 2020, 11, 606–619, doi:10.3762/bjnano.11.48

• –visible spectrophotometer (Thermal Scientific Evolution 201). The Fourier-transform infrared spectroscopy (FTIR) analysis of the prepared carbon nanoparticles was conducted on a Fourier transform infrared instrument (Nicolet iS50) in the wavenumber range of 400 to 4000 cm−1 at a resolution of 4 cm−1

• the irreversible change in the energy gap at high temperatures. The PL characteristics of CDs depend on the structure and composition of the CDs, as shown by the FTIR spectra of the HTC-CDs, annealed-CDs, and LA-CDs-10% (Figure 7). The FTIR spectrum of the HTC-CDs is similar to that of LA-CDs-10

• the range of 800–600 cm−1, corresponding to the bending vibrations of C–O and C–N bonds. Note that the FTIR spectra of all the LA-CDs-x% reveal the presence of N-containing groups, as shown in Figure S3f in Supporting Information File 1, suggesting that the LAL processing of the annealed-HTC carbon

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

• Nicole Fillafer,
• Tobias Seewald,
• Lukas Schmidt-Mende and
• Sebastian Polarz

Beilstein J. Nanotechnol. 2020, 11, 466–479, doi:10.3762/bjnano.11.38

• presence of the azo compounds was verified using a combination of Fourier-transform infrared (FTIR) and UV–vis absorption spectroscopy. A characteristic vibration at 2991 cm−1, which can be associated to the N–H stretching vibrations of the ammonium headgroup (Figure 4E), vanishes completely for 3D-AzoC2

• in Supporting Information File 1, Figure S15. (A–D) SEM images of particles with (A) AzoC1, (B) AzoC2, (C) AzoOC4 and (D) AzoOC12 ligands on the surface, scale bar = 1 µm. (E) FTIR transmission spectrum of non-functionalized CH3NH3PbBr3 (black), AzoC2 (red) and 3D-AzoC2 (blue). Wave numbers at 2991

Electrochemically derived functionalized graphene for bulk production of hydrogen peroxide

• Munaiah Yeddala,
• Pallavi Thakur,
• Anugraha A and
• Tharangattu N. Narayanan

Beilstein J. Nanotechnol. 2020, 11, 432–442, doi:10.3762/bjnano.11.34

• EEG samples. This correlates with the Fourier-transform infrared spectroscopy (FTIR) based analysis (Figure S1b), which also shows the presence of covalent C–F functional groups in all the samples. The samples also contain fluorine as one of the dopants with a content varying from 2.3 to 3.9 atom

• (see Figure 2a). In order to test the durability of the materials in acidic medium, chronoamperometry studies were carried out in 0.5 M H2SO4 at 0.45 V vs RHE for 3 h. The EEG samples were studied (before and after chronoamperometry) using Raman and FTIR spectroscopy along with the electrochemical

• experiment. The important Raman peaks are marked in the figure and the shoulder peak in “G” is due to the additional single phonon intra-valley scattering process (named as D’) which is due to the presence of defects. However, the FTIR spectrum (see Figure S4b) shows evidence for the formation of OH

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

• Changqiang Yu,
• Min Wen,
• Zhen Tong,
• Shuhua Li,
• Yanhong Yin,
• Xianbin Liu,
• Yesheng Li,
• Tongxiang Liang,
• Ziping Wu and
• Dionysios D. Dionysiou

Beilstein J. Nanotechnol. 2020, 11, 407–416, doi:10.3762/bjnano.11.31

• scanning electron microscope (SEM, Tescan, Czech) was used to observe the morphology. A Titan G2 60-300 transmission electron microscope (TEM, FEI, USA) was employed to analyze the microstructure. A NEXUS 670 spectrometer (Thermo Nicolet, USA) was employed for recording the Fourier transform infrared (FTIR

• to pure CuO, the binding energy of Cu 2p3/2 and Cu 2p1/2 for the CuO/tourmaline composite was shifted to 933.49 eV and 953.37 eV, respectively, providing evidence of the chemical interaction between CuO and tourmaline. It is convenient to detect the chemical bonds in complex materials by FTIR

• Figure 8, MB degradation over the CuO/tourmaline composite remained at 93.3% after being used for five times. There was no obvious distinction between the XRD patterns and FTIR spectra of the fresh and reused CuO/tourmaline composite, except for a slight decrease in the intensity (Supporting Information

Poly(1-vinylimidazole) polyplexes as novel therapeutic gene carriers for lung cancer therapy

• Gayathri Kandasamy,
• Elena N. Danilovtseva,
• Vadim V. Annenkov and
• Uma Maheswari Krishnan

Beilstein J. Nanotechnol. 2020, 11, 354–369, doi:10.3762/bjnano.11.26

• efficiency of the formed complexes in A549 lung cancer cells. The polyplex formed was found to exhibit 66% complexation efficiency. The complexation was confirmed by gel retardation assays, FTIR and thermal analysis. The blank PVI polymer was not toxic to cells. The polyplex was found to exhibit excellent

• reference. Fourier-transform infrared spectroscopy (FTIR): The FTIR spectra of the free siRNA, blank polymer nanoparticles and the polyplex were recorded between 4000 and 400 cm−1 averaging 10 scans per run in attenuated total reflection mode (ATR) using a Fourier-transform infrared spectrometer (Spectrum

• investigated by using FTIR and DSC (Figure 2). The FTIR of PVI shows vibration bands at 2950 cm−1 (imidazole C–H stretching vibrations) and at 1645, 1506 and 1411 cm−1 (imidazole C–N stretching vibrations). The N–H in-plane bending vibrations are observed at 1235 cm−1. The polyplex also shows stretching

Facile biogenic fabrication of hydroxyapatite nanorods using cuttlefish bone and their bactericidal and biocompatibility study

• Satheeshkumar Balu,
• Manisha Vidyavathy Sundaradoss,
• Swetha Andra and
• Jaison Jeevanandam

Beilstein J. Nanotechnol. 2020, 11, 285–295, doi:10.3762/bjnano.11.21

• ) nanorods using cuttlefish bone powder as a precursor (CB-Hap NRs). The obtained CB-Hap NRs were investigated using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) techniques to evaluate their

• physicochemical properties. The crystallite size (20.86 nm) obtained from XRD data and the elemental analysis (Ca/P molar ratio was estimated to be 1.6) showed that the Hap NRs are similar to that of natural human bone (≈1.67). Moreover, the FTIR data confirmed the presence of phosphate as a functional group and

• setup via an oil bath approach to synthesize Hap nanorods from cuttlefish bone powders and optimize their synthesis parameters. The systematic characterization using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) was performed to

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

• Tuba Evgin,
• Alpaslan Turgut,
• Georges Hamaoui,
• Zdenko Spitalsky,
• Nicolas Horny,
• Matej Micusik,
• Mihai Chirtoc,
• Mehmet Sarikanat and
• Maria Omastova

Beilstein J. Nanotechnol. 2020, 11, 167–179, doi:10.3762/bjnano.11.14

• contamination with sulfur was observed (0.3 atom %, S 2p at ≈164–169 eV). However, the small differences in the GnPs’ surfaces’ chemical composition did not affect the properties of the HDPE-based nanocomposites. The results of FTIR analysis are shown in Figure 3a (further details can be found in Figures S1–S7

• molding. The size effects of the GnPs on the morphological, thermal, electrical, and mechanical properties of the composites was studied. The small differences in the GnPs’ surfaces’ chemical composition were detected by XPS, and the highest amount of oxygen that was found was 2.6 atom % for G1. FTIR and

• XRD findings showed that the addition and size of GnPs led to slight differences in the FTIR spectra of the nanocomposites compared to that of pure HDPE, while the addition of GnPs affected the reflection peaks and peak intensities. Based on SEM images, all GnPs showed uniform and random dispersion in

Internalization mechanisms of cell-penetrating peptides

• Ivana Ruseska and
• Andreas Zimmer

Beilstein J. Nanotechnol. 2020, 11, 101–123, doi:10.3762/bjnano.11.10

• the cell membrane has been crossed. It was demonstrated that the free form of Pep-1 interacts strongly with the lipid components in the membrane, leading to a conformational change – the peptide tends to form α-helices. The conformational transitions have been confirmed by CD, NMR and FTIR data. The

Fully amino acid-based hydrogel as potential scaffold for cell culturing and drug delivery

• Dávid Juriga,
• Evelin Sipos,
• Orsolya Hegedűs,
• Gábor Varga,
• Miklós Zrínyi,
• Krisztina S. Nagy and
• Angéla Jedlovszky-Hajdú

Beilstein J. Nanotechnol. 2019, 10, 2579–2593, doi:10.3762/bjnano.10.249

• shrink. Between pH 6 and 8, the swelling degrees abruptly rise as the polymer networks are hydrolyzed. The successful hydrolysis was proved by FTIR spectroscopy (Supporting Information File 1, Figure S2). This kind of abrupt change was described in previous articles, where other molecules or only LYS

pH-Controlled fluorescence switching in water-dispersed polymer brushes grafted to modified boron nitride nanotubes for cellular imaging

• Saban Kalay,
• Yurij Stetsyshyn,
• Volodymyr Donchak,
• Khrystyna Harhay,
• Ostap Lishchynskyi,
• Halyna Ohar,
• Yuriy Panchenko,
• Stanislav Voronov and
• Mustafa Çulha

Beilstein J. Nanotechnol. 2019, 10, 2428–2439, doi:10.3762/bjnano.10.233

• thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), ultraviolet–visible spectrophotometry (UV–vis), laser scanning confocal microscopy (LSCM) and scanning electron microscopy (SEM). The DLS results demonstrated that P(AA-co-FA)-functionalized BNNTs

• heated from 30.00 to 600.00 °C at 10 °C/min. Fourier transform infrared spectroscopy (FTIR) FTIR spectra were recorded on a NICOLET iS50 FTIR spectrometer (Thermo Scientific, USA), equipped with a iS50 ATR multirange, diamond sampling station. The sample powders were either placed on diamond crystal or

• spectroscopic, gravimetric and imaging techniques including FTIR, UV–vis, DLS, TGA, LSCM and SEM. The fabrication of the oligoperoxide-functionalized BNNTs was described in detail in our previous publication [12] and here we focus on the synthesis and properties of the P(AA-co-FA)-functionalized BNNTs. The

Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation

• Nadra Bohli,
• Meryem Belkilani,
• Juan Casanova-Chafer,
• Eduard Llobet and
• Adnane Abdelghani

Beilstein J. Nanotechnol. 2019, 10, 2364–2373, doi:10.3762/bjnano.10.227

• spectroscopy (FTIR) were performed to characterize the gold nanoparticle decoration and to examine the thiol monolayer bonding to the MWCNTs. The detection of aromatic vapours using Au-MWCNT and HDT/Au-MWCNT sensors down to the ppm range shows that the presence of the self-assembled layer increases the

• [20]. Figure 1 shows the synoptic structure of the sensor before and after the HDT deposition. HRTEM and FTIR characterisation The analysis of the quantity and distribution of the gold nanoparticles attached to the MWCNTs was undertaken with a high-resolution transmission electron microscope (JEOL

• 1011), operating at 100 kV. An Alpha FTIR spectrometer (Bruker, France) equipped with an ATR platinum crystal diamond module was used, in absorbance mode, to obtain the infrared spectra of the gold-decorated MWCNTs before and after the deposition of the SAM monolayer. This technique provides useful

Nontoxic pyrite iron sulfide nanocrystals as second electron acceptor in PTB7:PC₇₁BM-based organic photovoltaic cells

• Olivia Amargós-Reyes,
• José-Luis Maldonado,
• Omar Martínez-Alvarez,
• María-Elena Nicho,
• José Santos-Cruz,
• Juan Nicasio-Collazo,
• Irving Caballero-Quintana and
• Concepción Arenas-Arrocena

Beilstein J. Nanotechnol. 2019, 10, 2238–2250, doi:10.3762/bjnano.10.216

• transform infrared (FTIR) spectra of the PTB7:PC71BM blend at different concentrations of FeS2. The band at 1727 cm−1, corresponding to the C=O stretching mode in PTB7:PC71BM [52], becomes ≈15 cm−1 wider upon the incorporation of FeS2. Specifically at 1 wt % of FeS2, the band at 1736 cm−1 becomes larger

• concentrations (0, 0.25, 0.5 and 0.1 wt %) spin-coated onto a corning glass at 1900 rpm for 60 s in order to obtain similar thickness (≈100 nm). We used a commercial UV–vis spectrometer (Lambda 900, Perkin Elmer Instruments). FTIR spectra were recorded with a Frontier MIR spectrophotometer (Perkin Elmer). The

• ITO (reference, black) and FeS2 NCs in TBAPF6 0.1 M at 100 mV s−1 (blue: anodic zone, red: cathodic zone). b) Flat energy diagram of the organic materials and FeS2 used for OPV fabrication [21]. a) UV–vis absorption and b) FTIR spectra of the blend PTB7:PC71BM at different FeS2 concentrations: 0.0

Targeted therapeutic effect against the breast cancer cell line MCF-7 with a CuFe₂O₄/silica/cisplatin nanocomposite formulation

• B. Rabindran Jermy,
• Vijaya Ravinayagam,
• Widyan A. Alamoudi,
• Dana Almohazey,
• Hatim Dafalla,
• Lina Hussain Allehaibi,
• Abdulhadi Baykal,
• Muhammet S. Toprak and
• Thirunavukkarasu Somanathan

Beilstein J. Nanotechnol. 2019, 10, 2217–2228, doi:10.3762/bjnano.10.214

• saline solution. The presence of cubic spinel CuFe2O4 on HYPS was confirmed through powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and diffuse reflectance UV–vis spectroscopy (DR UV–vis) analysis. The HYPS particles showed a surface area of 170 m2/g, pore size of 8.3 nm

• . Copper ferrite and cisplatin functional groups were identified using FTIR using ATR technology (Perkin Elmer, USA). The morphological features of the nanoformulations were identified by SEM and TEM. The elemental distribution in the samples was investigated using SEM-EDS. SEM was performed using a JSM

• nanoparticles at the pores of HYPS. The FTIR technique was used to confirm the bonding and vibrational modes of copper ferrite with silica (Figure 3). The FTIR spectra of HYPS showed several peaks corresponding to Si–O–Si stretching and vibration, hydroxyl and Si–O bonding around 432 cm−1, 800 cm−1 and between

Use of data processing for rapid detection of the prostate-specific antigen biomarker using immunomagnetic sandwich-type sensors

• Camila A. Proença,
• Tayane A. Freitas,
• Thaísa A. Baldo,
• Elsa M. Materón,
• Flávio M. Shimizu,
• Gabriella R. Ferreira,
• Frederico L. F. Soares,
• Ronaldo C. Faria and
• Osvaldo N. Oliveira Jr.

Beilstein J. Nanotechnol. 2019, 10, 2171–2181, doi:10.3762/bjnano.10.210

• spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS, Figure S1) is described. The Silhouette coefficients calculated for IDMAP, Sammon’s mapping (SM), principal

Improved adsorption and degradation performance by S-doping of (001)-TiO₂

• Xiao-Yu Sun,
• Xian Zhang,
• Xiao Sun,
• Ni-Xian Qian,
• Min Wang and
• Yong-Qing Ma

Beilstein J. Nanotechnol. 2019, 10, 2116–2127, doi:10.3762/bjnano.10.206

• probed by Fourier-transform infrared (FTIR) spectroscopy (Vertex 80/Hyperion2000, Bruker, Germany). The Brunauer–Emmett–Teller (BET) specific surface areas were calculated based on the N2 adsorption–desorption isotherms measured at 77 K using a gas adsorption apparatus (Autosorb-iQ, Quantachrome

• with the (004) crystal face. FTIR spectra were measured for all the samples. Figure 3 shows the results of the samples with RS/Ti = 0, 2 and 5. The positions of the absorption peaks and the corresponding assignments to vibrational modes are listed in Table 2. In contrast to the undoped 1-S0 and 2-S0

• . Conclusion S-doped (001)-TiO2 with different RS/Ti were synthesized by thermal chemical vapor deposition at 180 and 250 °C and systematically characterized by XRD, TEM, FTIR, XPS, UV–vis DRS, PL, BET and ESR. The S-doped sample produced at 180 °C shows little changes in the structure, morphology, chemical

Optimization and performance of nitrogen-doped carbon dots as a color conversion layer for white-LED applications

• Tugrul Guner,
• Hurriyet Yuce,
• Didem Tascioglu,
• Eren Simsek,
• Umut Savaci,
• Aziz Genc,
• Servet Turan and
• Mustafa M. Demir

Beilstein J. Nanotechnol. 2019, 10, 2004–2013, doi:10.3762/bjnano.10.197

• -Alpha XPS spectrometer. Fourier-transform infrared spectroscopy (FTIR; Spectrum 100, PerkinElmer, Shelton, CT, USA) was used to characterize the kinetic behavior of the chemical bonds. Photoluminescence (PL) and absorbance were measured using an integrating sphere (ISP-50-80-R, Ocean Optics Inc

• (002) plane. Further information on the characterization of the CDots together with an extended discussion of the XPS results (Figure S1), the results of the FTIR study (Figure S2a) and absorption and PL spectra (Figure S2b) can be found in Supporting Information File 1 (Section I). White-light

• varying amounts of the PVP/N-CDot fibers. Supporting Information Section I – XPS full scan spectrum of nitrogen-doped CDots; high-resolution C 1s, N 1s, and O 1s XPS spectra of nitrogen-doped CDots; FTIR, absorption and PL spectra of N-CDots in solution; Section II – Response of the varying amount of N

Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

• William W. Bryan,
• Riddhiman Medhi,
• Maria D. Marquez,
• Supparesk Rittikulsittichai,
• Michael Tran and
• T. Randall Lee

Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194

• . The morphology and composition of the composite nanoparticles were characterized by SEM, TEM, and FTIR, respectively. UV–vis spectroscopy was used to characterize the optical properties. Keywords: hydrogels; nanocapsules; photothermal delivery; poly(NIPAM); porous silver shells; Introduction

• of pDADMAC on the hydrogel particle surface, we analyzed the particles with Fourier transform infrared (FTIR) spectroscopy. Figure 1f shows the absorption spectra of pure pDADMAC and the modified hydrogel particles. The existence of stretching associated with the CH3 components at ≈1465 cm−1 and

• consistently uniform shape due to the soft hydrogel core, as discussed previously. As expected, without the addition of pDADMAC onto the surface of the hydrogel particles, insufficient seeding of the hydrogel cores was observed (data not shown). Thus, the FTIR spectra demonstrate the pDADMAC modification of

High-tolerance crystalline hydrogels formed from self-assembling cyclic dipeptide

• Yongcai You,
• Ruirui Xing,
• Qianli Zou,
• Feng Shi and
• Xuehai Yan

Beilstein J. Nanotechnol. 2019, 10, 1894–1901, doi:10.3762/bjnano.10.184

• ) (Figure 1A). The hydrogen bonding interactions between the C-WY molecules were investigated by Fourier-transform infrared spectroscopy (FTIR). Compared with the peak of amide N–H stretching located at 3344 cm−1 of the unimolecular C-WY, the hydrogel has a red-shifted amide N–H stretching band located at

• of CDPs can be valuable candidates for applications in harsh environments. CDP-based supramolecular hydrogels. (A) The structure of C-WY and a photo of the C-WY hydrogel. (B) FTIR spectra of C-WY powder and the C-WY hydrogel. (C) SEM and (D) TEM images of the C-WY hydrogel. Interior structure and

Long-term entrapment and temperature-controlled-release of SF₆ gas in metal–organic frameworks (MOFs)

• Hana Bunzen,
• Andreas Kalytta-Mewes,
• Leo van Wüllen and
• Dirk Volkmer

Beilstein J. Nanotechnol. 2019, 10, 1851–1859, doi:10.3762/bjnano.10.180

• infrared (FTIR) and 19F nuclear magnetic resonance (NMR) spectroscopy. SF6 is an inert, nonflammable and nontoxic gas, which is known to be an excellent dielectric gas for high-voltage applications [15][16]. At the same time, it is also known as one of the most severe greenhouse gases [17][18]. Therefore

• molecules left in the pores, thus ensuring that the whole pore volume was available for trapping the SF6 guest. The bulk sample was analyzed before and after the gas loading by conventional analytical methods, including FTIR, powder X-ray diffraction (XRD) and thermogravimetric analysis (TGA). SF6-loading

• of a guest released from a porous material. The determined value of the activation energy was further compared to the results obtained from computational simulations (see the dedicated section later in the text). To qualify the guest, we used FTIR spectroscopy (Figure 2 and Figure S5 in Supporting