Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots

• Vo Chau Ngoc Anh,
• Le Thi Thanh Nhi,
• Le Thi Kim Dung,
• Dang Thi Ngoc Hoa,
• Nguyen Truong Son,
• Nguyen Thi Thao Uyen,
• Nguyen Ngoc Uyen Thu,
• Le Van Thanh Son,
• Le Trung Hieu,
• Tran Ngoc Tuyen and
• Dinh Quang Khieu

Beilstein J. Nanotechnol. 2024, 15, 475–489, doi:10.3762/bjnano.15.43

• of the solid part extracted from the suspension of CF/GQDs-200. The FTIR spectra of CF and CF/GQDs-200 are shown in Figure 3a. CF has two broad bands at 387 and 580 cm−1, attributed to the characteristic stretching vibrations of the iron and cobalt bonds at the tetrahedral and octahedral sites

• , respectively [19]. For CF/GQDs, the broad bands from 750–400 cm−1 possibly involve the vibrations of metal and oxygen in cobalt ferrite. The bands at 3408–3450 cm−1 are attributed to stretching vibrations of O–H groups, while the bands at 1622, 1375, 1233, and 1080 cm−1 are assigned to C=C vibrations of

• aromatic carbons, O–H bending in carboxylic and carbonyl groups, C=O vibrations in epoxy groups, and stretching vibrations of C–O in alkoxy groups, respectively [20][21]. These functional groups prove the existence of GQDs in CF/GQDs. The Raman spectra of CF and CF/GQDs are presented in Figure 3b,c. CF

Potential of a deep eutectic solvent in silver nanoparticle fabrication for antibiotic residue detection

• Le Hong Tho,
• Bui Xuan Khuyen,
• Ngoc Xuan Dat Mai and
• Nhu Hoa Thi Tran

Beilstein J. Nanotechnol. 2024, 15, 426–434, doi:10.3762/bjnano.15.38

• spectra of SERS-based biosensors are simple but powerful results, in which every single component of the analytes can be recognized via characteristic vibrations of identical groups [1]. In particular, SERS is an advantageous and practical choice for biosensors in clinical settings thanks to fast response

• ). At the limit of detection (LOD) of 10−8 M, the SERS spectrum clearly shows emerging peaks, the highest enhancement factor (EF) of which reaches 6.29 × 107, proving the NFT residue tracing capability of the Ag NPs-DES substrate. These peaks correspond to vibrations of characteristic groups of NFT as

Vinorelbine-loaded multifunctional magnetic nanoparticles as anticancer drug delivery systems: synthesis, characterization, and in vitro release study

• Zeynep Özcan and
• Afife Binnaz Hazar Yoruç

Beilstein J. Nanotechnol. 2024, 15, 256–269, doi:10.3762/bjnano.15.24

• can be attributed to the vibration associated with stretching hydroxy (–OH) groups in Fe3O4 NPs (Figure 4a). FTIR analysis revealed that the peaks observed at 1150 and 2890 cm–1 correspond to the vibrations associated with stretching C–O–C and C–H groups in SH-PEG, respectively [50]. The presence of

CdSe/ZnS quantum dots as a booster in the active layer of distributed ternary organic photovoltaics

• Gabriela Lewińska,
• Piotr Jeleń,
• Zofia Kucia,
• Maciej Sitarz,
• Łukasz Walczak,
• Bartłomiej Szafraniak,
• Jerzy Sanetra and
• Konstanty W. Marszalek

Beilstein J. Nanotechnol. 2024, 15, 144–156, doi:10.3762/bjnano.15.14

• recorded previously [49]. The C–S–C ring deformation (725 cm−1), C–C intra-ring stretching (1,379 cm−1), and symmetric C=C stretching vibrations (1,447 cm−1) of P3HT were outlined. The PCBM Raman spectrum has four peaks at 658, 1,038, 1,127, and 1,570 cm−1. Raman spectra for the mixtures considered are

Berberine-loaded polylactic acid nanofiber scaffold as a drug delivery system: The relationship between chemical characteristics, drug-release behavior, and antibacterial efficiency

• Le Thi Le,
• Hue Thi Nguyen,
• Liem Thanh Nguyen,
• Huy Quang Tran and
• Thuy Thi Thu Nguyen

Beilstein J. Nanotechnol. 2024, 15, 71–82, doi:10.3762/bjnano.15.7

• bonds, Fourier transform infrared spectroscopy (FTIR) was used to examine the differences in chemical characteristics of BBR-loaded PLA nanofiber scaffolds (Figure 2A). The FTIR spectrum of PLA nanofiber scaffold shows the adsorption peaks at 1751 cm−1 resulting from the stretching vibrations of the C=O

• bond in carboxylic groups. The two bands at 1182 cm−1 and 1087 cm−1 were attributed to the C–O–C binding vibrations. The absorption bands at 2992 cm−1 and 2947 cm−1 were characteristics of asymmetrical and symmetrical stretching vibrations of the C–H bond, while the asymmetrical vibrations of –CH3

Influence of conductive carbon and MnCo₂O₄ on morphological and electrical properties of hydrogels for electrochemical energy conversion

• Sylwia Pawłowska,
• Karolina Cysewska,
• Yasamin Ziai,
• Jakub Karczewski,
• Piotr Jasiński and
• Sebastian Molin

Beilstein J. Nanotechnol. 2024, 15, 57–70, doi:10.3762/bjnano.15.6

• spectrum of MnCo2O4, two transmittance bands at 620 and 478 cm−1, characteristic of M–O stretching and vibrations of the spinel structure, were visible (Figure 3b) [49][50]. In the case of super P Li conductive carbon black, no distinct peaks can be seen in the FTIR spectra. However, it is visible that

Curcumin-loaded albumin submicron particles with potential as a cancer therapy: an in vitro study

• Nittiya Suwannasom,
• Netsai Sriaksorn,
• Chutamas Thepmalee,
• Krissana Khoothiam,
• Ausanai Prapan,
• Hans Bäumler and
• Chonthida Thephinlap

Beilstein J. Nanotechnol. 2023, 14, 1127–1140, doi:10.3762/bjnano.14.93

• from CUR within CUR-HSA-MPs. FTIR analyses were used to confirm the chemical binding of CUR to HSA (Figure 3A). The FTIR spectrum of CUR (blue line spectrum) demonstrated bands at 3501 cm−1 (broad, phenolic O–H stretching vibration), 1667 cm−1 (stretching vibrations of the benzene ring of CUR), 1513 cm

• −1 (C=O and C=C vibrations), and 1435 cm−1 (olefinic C–H bending vibration). The 1309 cm−1 band corresponds to the aromatic C–O stretching vibrations, while the C–O–C stretching vibrations were represented at 1020/951 cm−1 [35]. The characteristic adsorption bands of pure HSA (pink line spectrum) at

• 1644 and 1546 cm−1 indicated the vibration adsorption of amide I (C=O stretching) and amide II (C–N stretching and N–H bending vibrations), respectively. These are the main vibrational bands in the albumin backbone that formed the secondary structure of the protein. It is also seen that the absorption

Isolation of cubic Si₃P₄ in the form of nanocrystals

• Polina K. Nikiforova,
• Sergei S. Bubenov,
• Vadim B. Platonov,
• Andrey S. Kumskov,
• Nikolay N. Kononov,
• Tatyana A. Kuznetsova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2023, 14, 971–979, doi:10.3762/bjnano.14.80

• FTIR spectroscopy of the etching product are shown in Figure 1). The bands with the wavenumbers of 2105 and 2900 cm−1, and the broad signal at 3400 cm−1 were attributed to vibrations of Si–H, C–H, and O–H bonds, respectively [25]. The IR spectra of the unetched Si NPs display bands in a wavenumber

• range of 1000–1200 cm−1, which were associated to the stretching vibrations of Si–O bonds occurring in the oxide layer on the surface of the Si NPs [26][27][28]. A detailed comparison of bands and vibrations can be found in Table S1 of Supporting Information File 1. The analysis of the diffractogram of

• analysis for the Si3P4 unit cell yields Γoptic = A1 + E + 2T1 + 3T2, Raman active vibrations of the representations A1, as well as E and T2, totaling five prior to splitting. DFT calculations were used to tentatively assign symmetries to the observed Raman modes (Table 2). The resultant structural

Upscaling the urea method synthesis of CoAl layered double hydroxides

• Camilo Jaramillo-Hernández,
• Víctor Oestreicher,
• Martín Mizrahi and
• Gonzalo Abellán

Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76

• anions (Figure 1B). In the case of the reference x1, the spectrum displays a broad signal at ca. 3400 cm−1, which corresponds to the OH stretching vibrations typically attributed to interlayer water molecules, as confirmed by the extra signal at 1600 cm−1 (water bending mode). The presence of carbonate

Ultralow-energy amorphization of contaminated silicon samples investigated by molecular dynamics

• Grégoire R. N. Defoort-Levkov,
• Alan Bahm and
• Patrick Philipp

Beilstein J. Nanotechnol. 2023, 14, 834–849, doi:10.3762/bjnano.14.68

• amorphous region”, where 0.89 < µ < 0.94. The damage induced by ion Ar irradiation has not yet completely disturbed the local order. This region is always located between the crystalline and amorphous slabs. In the crystalline region, the sample is intact, and only thermal vibrations occurs. The amorphous

A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection

• Yi Luo,
• Jian Liu,
• Jiachang Zhang,
• Yu Xiao,
• Ying Wu and
• Zhidong Zhao

Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67

• known as the positive piezoelectric effect. Most current electronic stethoscopes utilize the positive piezoelectric properties of rigid piezoelectric materials such as lead zirconate titanate (Pb(Zr1−xTix)O3, PZT). These materials convert sound wave vibrations into proportional electrical signals. After

Nanostructured lipid carriers containing benznidazole: physicochemical, biopharmaceutical and cellular in vitro studies

• Giuliana Muraca,
• María Esperanza Ruiz,
• Rocío C. Gambaro,
• Sebastián Scioli-Montoto,
• María Laura Sbaraglini,
• Gisel Padula,
• José Sebastián Cisneros,
• Cecilia Yamil Chain,
• Vera A. Álvarez,
• Cristián Huck-Iriart,
• Guillermo R. Castro,
• María Belén Piñero,
• Matias Ildebrando Marchetto,
• Catalina Alba Soto,
• Germán A. Islan and
• Alan Talevi

Beilstein J. Nanotechnol. 2023, 14, 804–818, doi:10.3762/bjnano.14.66

• to C=O and C–O stretching of ester groups, respectively. The peak at 1467 cm−1 was associated with the deforming vibrations of the C–H of alkanes [27]. The characteristic peaks of poloxamer 188 were at 3600 cm−1 relative to the O–H stretching, the intense peak at 2873 cm−1 corresponding to C–H

Silver-based SERS substrates fabricated using a 3D printed microfluidic device

• Phommachith Sonexai,
• Minh Van Nguyen,
• Bui The Huy and
• Yong-Ill Lee

Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65

• substrates with different etching times. The spectra exhibit peaks at 621, 1199, 1279, 1358, 1508, 1528, and 1647 cm−1. The peaks at 621, 1199, and 1279 cm−1 are related to deformation vibrations of the xanthene ring, the stretching of the C–C bridge bands, and the bending of the aromatic C–H bonds

• spectrum of MLM exhibits strong peaks at 583, 676, and 983 cm−1. The peak at 583 cm−1 is related to a mixed mode of N–C–N bending and NH2 twisting vibrations. The peak at 676 cm−1 is attributed to the plane deformation modes of the triazine ring, and the peak at 983 cm−1 is ascribed to C–N–C bending

• vibrations [54][55]. The Raman spectra of MLM on the PS@Ag SERS substrate shows peaks at 585, 679, and 985 cm−1, which are shifted compared to those in the Raman spectrum of MLM because of the interaction between MLM and the Ag surface. The SERS intensity at the fingerprint peak of 682 cm−1 as a function of

Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity

• Nguyen Thi Thanh Tu,
• T. Lan-Anh Vo,
• T. Thu-Trang Ho,
• Kim-Phuong T. Dang,
• Van-Dung Le,
• Phan Nhat Minh,
• Chi-Hien Dang,
• Vinh-Thien Tran,
• Van-Su Dang,
• Tran Thi Kim Chi,
• Hieu Vu-Quang,
• Radek Fajgar,
• Thi-Lan-Huong Nguyen,
• Van-Dat Doan and
• Thanh-Danh Nguyen

Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64

• exhibit similar signals, including broad band at around 3400 and 2900 cm−1, attributed, respectively, to the –OH and –CH stretching vibrations of the sugar units of polysaccharides [40]. Furthermore, single peaks at 1600 and 1436 cm−1 are observed, corresponding to the symmetric and asymmetric stretching

• vibrations of COO− groups, respectively [41]. Additionally, the peaks at 1034 and 826 cm−1 are attributed to the stretching vibration of C–OH groups and the bending vibration of –CH groups [42]. Based on these data, it can be inferred that the primary components of the nanocomposites are polysaccharides. To

In situ magnesiothermic reduction synthesis of a Ge@C composite for high-performance lithium-ion batterie anodes

• Ha Tran Huu,
• Ngoc Phi Nguyen,
• Vuong Hoang Ngo,
• Huy Hoang Luc,
• Minh Kha Le,
• Minh Thu Nguyen,
• My Loan Phung Le,
• Hye Rim Kim,
• In Young Kim,
• Sung Jin Kim,
• Van Man Tran and
• Vien Vo

Beilstein J. Nanotechnol. 2023, 14, 751–761, doi:10.3762/bjnano.14.62

• stretching motions of C=O and C=C groups. The remaining band are stretching vibrations of alkoxy C–O or aromatic bonds [39]. Further analysis of the structure of pure Ge, biomass-derived carbon, and chemical contact between Ge and carbon matrix in the composites was conducted using Raman spectra. As shown in

Current-induced mechanical torque in chiral molecular rotors

• Richard Korytár and
• Ferdinand Evers

Beilstein J. Nanotechnol. 2023, 14, 711–721, doi:10.3762/bjnano.14.57

• -induced torques have been obtained within the non-equilibrium Green’s function formalism [13][14]. The current excites a variety of molecular vibrational modes, rendering the atomistic analysis of the torque very complex (see [6] for an ab initio calculation of the vibrations). To bring about a controlled

A graphene quantum dots–glassy carbon electrode-based electrochemical sensor for monitoring malathion

• Sanju Tanwar,
• Aditi Sharma and
• Dhirendra Mathur

Beilstein J. Nanotechnol. 2023, 14, 701–710, doi:10.3762/bjnano.14.56

• shows the presence of only carbon and oxygen in the GQDs with 82.35 atom % carbon and 17.65 atom % oxygen. Figure 5a shows the functional groups present on the surface of the GQDs measured using FTIR infrared spectroscopy. The broad absorption band at 3430 cm−1 corresponds to stretching vibrations of O

• –H bonds [36], which impart hydrophilicity to GQDs to form a dispersion in water. Similarly, the peaks at 2923 and 2850 cm−1 may be assigned to C–H stretching vibrations, the peaks at 2358, 1040, and 1158 cm−1 to C–O stretching vibrations, the peaks at 1625 cm−1 to C=C vibrations, and the peaks at

• 1380 cm−1 to C–H vibrations of alkyl groups [37]. It can be inferred that the surface of GQDs is passivated by surface groups that occur during the carbonization of glucose. The Raman spectrum of the GQDs in the spectral range of 1000–2000 cm−1 without any baseline correction displays typical D (ca

Plasmonic nanotechnology for photothermal applications – an evaluation

• A. R. Indhu,
• L. Keerthana and
• Gnanaprakash Dharmalingam

Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33

• corresponding to the continuum of frequencies ω(q) [77]. Their postulation and confirmation arose initially to reconcile deviations of the specific heat of materials at different temperatures from the Dulong–Petit law. The quantized characteristic (Eigen)energies of these vibrations are simply: where ℏ is

Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities

• Akif Hakan Kurt,
• Elif Berna Olutas,
• Fatma Avcioglu,
• Hamza Karakuş,
• Mehmet Ali Sungur,
• Cansu Kara Oztabag and
• Muhammet Yıldırım

Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31

• characteristic C=C aromatic ring stretching bands were observed at 1614, 1562, and 1514 cm−1. The peaks at 1355, 1314, and 1265 cm−1 were attributed to aromatic C–H and O–H bending vibrations in quercetin. The FTIR spectrum of pure caffeic acid (Figure 3b) shows intense bands at 3401 and 3220 cm−1 indicating O–H

Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine

• Zoran M. Marković,
• Milica D. Budimir,
• Martin Danko,
• Dušan D. Milivojević,
• Pavel Kubat,
• Danica Z. Zmejkoski,
• Vladimir B. Pavlović,
• Marija M. Mojsin,
• Milena J. Stevanović and
• Biljana M. Todorović Marković

Beilstein J. Nanotechnol. 2023, 14, 165–174, doi:10.3762/bjnano.14.17

• CQDs, FTIR, UV–vis, and PL spectra were measured. A FTIR spectrum of the CQDs is presented in Figure S2a (Supporting Information File 1). The spectrum contains many peaks associated with the following bonds: Peaks at 3634 and 3448 cm−1 stem from O–H stretching vibrations. A peak at 3367 cm−1 could be

• assigned to N–H stretching vibrations of aliphatic primary amines whereas the peaks at 2880 and 2943 cm−1 originate from C–H stretching vibrations. A peak at 1759 cm−1 stems from C=O stretching vibrations (carboxylic acid) whereas the peaks at 1696 and 1593 cm−1 could be assigned to C=N stretching and N–H

• bending vibrations, respectively. The peaks at 1521 and 1061 cm−1 stem from N–O stretching and C–O stretching vibrations, respectively. The peaks at 961, 815, and 759 cm−1 could be assigned to C=C bending, C-H bending, and C=C bending vibrations, respectively [30]. An et al. reported that XPS analysis of

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

• Alexander Vakhrushev,
• Aleksey Fedotov,
• Olesya Severyukhina and
• Anatolie Sidorenko

Beilstein J. Nanotechnol. 2023, 14, 23–33, doi:10.3762/bjnano.14.3

• magnetic properties based on the combined model of molecular dynamics and magnetization dynamics. The technique used includes simulations of atomic magnetic spins associated with lattice vibrations. The dynamics of these magnetic spins can be used to simulate a wide range of phenomena related to

Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

• Mykhailo Nahorniak,
• Pamela Pasetto,
• Jean-Marc Greneche,
• Volodymyr Samaryk,
• Sandy Auguste,
• Anthony Rousseau,
• Nataliya Nosova and
• Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

• visible at 1577 and 1524 cm−1 and a band at 432 cm−1 corresponds to the vibrations of Fe–O or С–СН3 [29][30]. At the end of the first stage (SFin Stage1), the absorption bands corresponding to the acetylacetonate ligand or acetylacetone residues are not observed. The absorption band at 432 cm−1 also

• disappears, which indicates that it has been correctly attributed to C–CH3 fragments [30]. The IR bands characteristic of metal carboxylates are in the range of 1650–1500 cm−1 for the asymmetrical vibrations and 1450–1300 cm−1 for the symmetrical vibrations. The difference between the bands ν(COO

• , which appeared in the spectra of the reaction mixture of both oleate and undecylate complexes in octadecene, corresponds to vibrations of the carbonyl group of free unassociated acid. This band is not observed in the spectra of pure acids. The absorption band at 1711 cm−1 in both cases can be attributed

Photoelectrochemical water oxidation over TiO₂ nanotubes modified with MoS₂ and g-C₃N₄

• Phuong Hoang Nguyen,
• Thi Minh Cao,
• Tho Truong Nguyen,
• Hien Duy Tong and
• Viet Van Pham

Beilstein J. Nanotechnol. 2022, 13, 1541–1550, doi:10.3762/bjnano.13.127

• determined by using FTIR spectroscopy, as shown in Figure 3b. The formation of TiO2 on the Ti foil is indicated by the vibrations of the Ti–O bond in the wavenumber region from 450 to 750 cm−1 [47]. The bonding characteristics in the MoS2 material are presented by Mo–S vibration peaks between 1620 and 420 cm

• bonds, there are vibrations of composites of TNAs with MoS2 (between 420 and 1620 cm−1) and g-C3N4 (between 1200 and 1640 cm−1 for C–N bonds and 807 cm−1 for tri-s-triazine subunit). The peaks in the wavenumber range between 3400 and 1625 cm−1 of all samples are typical for stretching vibrations of the

Frequency-dependent nanomechanical profiling for medical diagnosis

• Santiago D. Solares and
• Alexander X. Cartagena-Rivera

Beilstein J. Nanotechnol. 2022, 13, 1483–1489, doi:10.3762/bjnano.13.122

• would be extremely beneficial. This would allow, for example, for the tailoring of artificial tissues to the type of stimuli associated with specific types of activities, such as job-related mechanical vibrations at different frequencies, sports-related accelerations, and other ergonomic factors

Rapid fabrication of MgO@g-C₃N₄ heterojunctions for photocatalytic nitric oxide removal

• Minh-Thuan Pham,
• Duyen P. H. Tran,
• Xuan-Thanh Bui and
• Sheng-Jie You

Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96

• higher than 5% had been added [33][51]. Figure 4b shows the FTIR spectra of g-C3N4, MgO, and MgO@g-C3N4. For pure g-C3N4, the broad peak in the range of 3000–3600 cm−1 was attributed to the stretching vibrations of N–H and O–H bonds, indicating the existence of amino groups and adsorbed water molecules

• in the material [32][52]. The characteristic peaks at 1240, 1320, 1407, and 1465 cm−1 were associated with the stretching vibrations of aromatic C–N bonds, and the typical peaks at 1562 and 1642 cm−1 characterize the presence of C=O bonds [53][54]. In addition, the characteristic peak at 810 cm−1