Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

• Akeem Adeyemi Oladipo,
• Saba Derakhshan Oskouei and
• Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

• antibiotics (such as metronidazole, ornidazole, nitrofurantoin, and ronidazole) in water, Fan et al. [53] synthesised a chemically stable zinc-based MOF that functions as a multi-responsive luminescent sensor. With the addition of the antibiotics, the MOF’s luminescence intensity decreased, with LOD values

• states produced by this method are “charge-separated” states. The emission and absorption spectra make it simple to discriminate between PET and ICT. Although there is a significant quenching of luminescence intensity in PET, there is no visible spectral shift. Contrarily, ICT yields environment

• -dependent changes in luminescence intensity along with sizable modifications in the excitation and emission spectra. Electrochemical sensors Recent years have seen a significant increase in the use of electrochemical sensors [1][7][9][28][29][30][31][32][33][55][56][57][58][59][60] that use nanostructured

Theranostic potential of self-luminescent branched polyethyleneimine-coated superparamagnetic iron oxide nanoparticles

• Rouhollah Khodadust,
• Ozlem Unal and
• Havva Yagci Acar

Beilstein J. Nanotechnol. 2022, 13, 82–95, doi:10.3762/bjnano.13.6

• of Erb to nanoparticles consumed some amines, and the antibody contains anionic functionalities as well. The Erb conjugation decreased the luminescence intensity of SPION@bPEI by approx. 30%, but PIC loading (Figure 2b) or DNA loading did not change the luminescence intensity any further (Supporting

Plasmon-enhanced photoluminescence from TiO₂ and TeO₂ thin films doped by Eu³⁺ for optoelectronic applications

• Marcin Łapiński,
• Jakub Czubek,
• Katarzyna Drozdowska,
• Anna Synak,
• Wojciech Sadowski and
• Barbara Kościelska

Beilstein J. Nanotechnol. 2021, 12, 1271–1278, doi:10.3762/bjnano.12.94

• investigated by SEM and TEM, while the composition of oxides film was analyzed by XPS. Luminescence properties were studied on the basis of excitation and emission spectra. The experiments show that the additional dielectric layer enhances the luminescence intensity. Such structures could be potential

• position is observed (Figure 12). From the luminescence spectra in Figure 13 it can be seen that it is possible to enhance of luminescence intensity by an ultrathin TiO2 film, almost as much as by Al2O3. Conclusion In this work we showed an interesting material in which europium ions dispersed in a thin

• distribution of luminescent ions in a host matrix. Usually, such centrosymmetric matrices are crystalline structures or consist of some crystal areas. The intensity of excitation and emission peaks for titanium dioxide- and tellurium dioxide-based structures, are presented in Figure 11. The luminescence

Effect of different silica coatings on the toxicity of upconversion nanoparticles on RAW 264.7 macrophage cells

• Cynthia Kembuan,
• Helena Oliveira and
• Christina Graf

Beilstein J. Nanotechnol. 2021, 12, 35–48, doi:10.3762/bjnano.12.3

• , UCNPs in aqueous dispersions undergo minor disintegration, which also results in the quenching of their luminescence intensity [8][10][18][19][20][21][22][23]. This concentration-dependent effect is especially significant when the dispersions are highly diluted [8][19][22], when the pH value is low [22

Self-assembly of a terbium(III) 1D coordination polymer on mica

• Quentin Evrard,
• Giuseppe Cucinotta,
• Felix Houard,
• Guillaume Calvez,
• Yan Suffren,
• Carole Daiguebonne,
• Olivier Guillou,
• Andrea Caneschi,
• Matteo Mannini and
• Kevin Bernot

Beilstein J. Nanotechnol. 2019, 10, 2440–2448, doi:10.3762/bjnano.10.234

• quenching [30] and by the decrease of the lifetime from 375 µs for [Tb(hfac)3·2H2O] to 132 µs for [Tb(hfac)3·2H2O]n@mica (Table 1). Furthermore, the very small amount of luminescent material present on the mica substrate reduces the luminescence intensity (see magnetic quantification). The quantum yields

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

• carriers, because increased photo-generated electron–hole pair recombination results in a stronger luminescence intensity. Figure 9 representatively shows the PL spectra of the 2-S0, 2-S0.5, 2-S2, 2-S3 and 2-S5 samples. For all the samples, the emission peaks are located at 421, 474 and 541 nm. The

• emission peak at 421 nm results from the interband transition of TiO2. The emission peaks at 474 and 541 nm can be attributed to the radiative recombination of the self-trapped excitons and the hydroxylated Ti3+ surface complexes, respectively [53][54]. Obviously, the luminescence intensity initially

• increases for larger RS/Ti with sample 2-S2 having the strongest luminous intensity. Then, for samples 2-S3 to 2-S5, the luminescence intensity decreases again with sample 2-S5 having the weakest intensity. In contrast, no such obvious change of the luminescence intensity with increasing RS/Ti has been

Janus-micromotor-based on–off luminescence sensor for active TNT detection

• Ye Yuan,
• Changyong Gao,
• Daolin Wang,
• Chang Zhou,
• Baohua Zhu and
• Qiang He

Beilstein J. Nanotechnol. 2019, 10, 1324–1331, doi:10.3762/bjnano.10.131

• surface of the UCNPs could chemically recognize the TNT molecules efficiently and form a Meisenheimer complex which has a strong absorption within the emission spectrum of the UCNPs. Due to the fluorescence resonance energy transfer from the excited UCNPs to the complex, the luminescence intensity of the

• movement in 5% H2O2 with 0.5 mg mL−1 of TNT, indicating that the green upconversion luminescence (543 nm) of the UCNPs was quenched by the presence of TNT. The TNT sensing capability of these Janus UCNPs capsule motors was further evaluated by measuring the luminescence intensity. Figure 3d illustrates the

• ) + 24.45. The inset image in Figure 3d shows that a linear relationship exists between the luminescence intensity of the Janus UCNP capsule motors and the natural logarithm of the TNT concentration. The corresponding limit of detection (LOD) is calculated to be 2.4 ng mL−1 according to the equation LOD

Time-resolved universal temperature measurements using NaYF₄:Er³⁺,Yb³⁺ upconverting nanoparticles in an electrospray jet

• Kristina Shrestha,
• Arwa A. Alaulamie,
• Ali Rafiei Miandashti and
• Hugh H. Richardson

Beilstein J. Nanotechnol. 2018, 9, 2916–2924, doi:10.3762/bjnano.9.270

• UCNPs minimizes tissue damage [2], is relatively free of background fluorescence [3], and has a high penetration depth [3][4]. Time-resolved temperature measurements using the luminescence intensity ratio (LIR) of UCNPs are rare [5][6]. Here we show that NaYF4:Er3+,Yb3+ UCNPs can provide time-resolved

• problems when using the luminescence intensity ratio (LIR) to measure temperature unless a calibration is done under identical conditions. We find that this problem can be circumvented by integrating the S-band just over the wavelength range from 536 to 548 nm (the first two peaks in the S-band). The S

• observing particles standing on end in the SEM image (see Figure 1A arrow). The optical response from the UCNPs with temperature is shown in Figure 2. The UCNPs are excited with 980 nm laser light and emit in the visible. It has been previously shown that the luminescence intensity ratio (LIR) between the H

Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields

• Margarita A. Kurochkina,
• Elena A. Konshina and
• Daria Khmelevskaia

Beilstein J. Nanotechnol. 2018, 9, 1544–1549, doi:10.3762/bjnano.9.145

• obtained results are interesting for controlling the PL intensity of semiconductor QDs in liquid crystals by the application of electric fields. Keywords: aggregation; decay time; liquid crystal; luminescence intensity; orientation; Introduction Colloidal quantum dots (QDs) are a special kind of

• LC monomers and dimers [21]. The peak of the maximum luminescence intensity of QDs with 5 nm core diameter is at the wavelength of 630 nm. The quantum yield of the semiconductor NPs luminescence strongly depends on the polarity of the surrounding molecules, the electrostatic properties, the

• with increasing electric field strength. As a result, the luminescence intensity remained at the previously achieved level. We assume that the processes of buildup and quenching of the QDs luminescence can occur simultaneously in a passive LC matrix. In the active LC matrix they occur successively and

Facile fabrication of luminescent organic dots by thermolysis of citric acid in urea melt, and their use for cell staining and polyelectrolyte microcapsule labelling

• Nadezhda M. Zholobak,
• Anton L. Popov,
• Alexander B. Shcherbakov,
• Nelly R. Popova,
• Mykhailo M. Guzyk,
• Valeriy P. Antonovich,
• Alla V. Yegorova,
• Yuliya V. Scrypynets,
• Inna I. Leonenko,
• Alexander Ye. Baranchikov and
• Vladimir K. Ivanov

Beilstein J. Nanotechnol. 2016, 7, 1905–1917, doi:10.3762/bjnano.7.182

• acid/urea in the precursor mixtures from 1:1 to 1:2, 1:3, 1:4 and 1:5, the absorption spectra of products were changed (Figure 1) and the luminescence emission maxima were shifted to higher wavelengths (Figure 2, left). The dependence of luminescence intensity from the citric acid/urea molar ratio was

• water). The colour of the graph areas corresponds to the colour of luminescence. Right: Luminescence intensity of the citric acid heated in the urea melt at 160 °C for 120 min (aqueous solution 2 μg/mL). The x-axis is molar ratio of citric acid to urea. The control sample consisted of the products of

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

• Gaber Hashem Gaber Ahmed,
• Rosana Badía Laíño,
• Josefa Angela García Calzón and
• Marta Elena Díaz García

Beilstein J. Nanotechnol. 2016, 7, 758–766, doi:10.3762/bjnano.7.67

• measurement The PL quantum yield was calculated through the well-established comparative method using quinine sulfate as a reference. The following equations were used in the quantum yield measurement: where is the quantum yield, F is the calculated integrated luminescence intensity, n is the refractive

Fabrication and properties of luminescence polymer composites with erbium/ytterbium oxides and gold nanoparticles

• Julia A. Burunkova,
• Ihor Yu. Denisiuk,
• Dmitri I. Zhuk,
• Lajos Daroczi,
• Attila Csik,
• István Csarnovics and
• Sándor Kokenyesi

Beilstein J. Nanotechnol. 2016, 7, 630–636, doi:10.3762/bjnano.7.55

• nanoparticles is not always a good solution to the problem because of the possible decrease of luminescence intensity due to the counterproductive introduction of energy-transfer processes at high concentrations of rare earth ions. For example, as it was shown in [5] for Er-doped silicon materials, a practical

• of the rare-earth luminescence intensity was detected in the presence of plasmon fields, which were generated around metallic nanoparticles. This effect seems to be applicable for Er-containing polymer nanocomposites as well. At the same time the influence of metallic nanoparticles can be negative

Silica-coated upconversion lanthanide nanoparticles: The effect of crystal design on morphology, structure and optical properties

• Uliana Kostiv,
• Miroslav Šlouf,
• Hana Macková,
• Alexander Zhigunov,
• Hana Engstová,
• Katarína Smolková,
• Petr Ježek and
• Daniel Horák

Beilstein J. Nanotechnol. 2015, 6, 2290–2299, doi:10.3762/bjnano.6.235

• transitions, respectively. These bands were induced by 4f–4f transitions of the Er3+ ions. Because the red light photons are important for prospective biomedical applications, the I545/I660 ratio should be rather low and the total luminescence intensity high. The ratio of green to red emission intensities

Addition of Zn during the phosphine-based synthesis of indium phospide quantum dots: doping and surface passivation

• Natalia E. Mordvinova,
• Alexander A. Vinokurov,
• Oleg I. Lebedev,
• Tatiana A. Kuznetsova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2015, 6, 1237–1246, doi:10.3762/bjnano.6.127

• . However, the excess myristic acid has a detrimental effect on the optical properties: The samples exhibit a more diffused absorption peak for both small and large amounts of Zn precursor (Figure 1). A high polydispersity of the samples is confirmed by TEM. The luminescence intensity for the samples with

• change any further and also reaches a steady level of about 7.5%. The dependence of QY on the Zn amount was obtained right after synthesis for all samples (Figure 7a). This significant improvement of the luminescence intensity is similar to that of one effective post-synthesis treatment, namely the

• case a covering of the particles with zinc myristate occurs. During the synthesis zinc myristate covers the nucleus and prevents the particle growth and at the same time leads to an increase of the luminescence intensity through the reduction of phosphorus dangling bonds. The real Zn amount in the

Size-dependent density of zirconia nanoparticles

• Agnieszka Opalinska,
• Iwona Malka,
• Wojciech Dzwolak,
• Tadeusz Chudoba,
• Adam Presz and
• Witold Lojkowski

Beilstein J. Nanotechnol. 2015, 6, 27–35, doi:10.3762/bjnano.6.4

• as a luminescent material, the luminescence intensity increases with crystallite size [17]. The size and surface properties of NPs are also important for toxicology and health applications. The size of the NPs can influence their distribution in the human body and the mechanism of their penetration

• as their chemical reactivity and hydrophilic properties. The hydroxy groups on the NP surface can also operate as effective adsorption sites for organic substances from the atmosphere [23]. Grave and colleagues attributed the increase of the nanopowder luminescence intensity with gain growth to the

Silicon and germanium nanocrystals: properties and characterization

• Ivana Capan,
• Alexandra Carvalho and
• José Coutinho

Beilstein J. Nanotechnol. 2014, 5, 1787–1794, doi:10.3762/bjnano.5.189

• luminescence intensity in the visible and near-infrared region. A size-dependent blue shift of the luminescence comparable to porous Si is well documented. Figure 1 shows PL spectra of Si NCs produced by ion implantation and subsequent annealing [34]. The emission is tuned by varying the implantation and

An insight into the mechanism of charge-transfer of hybrid polymer:ternary/quaternary chalcopyrite colloidal nanocrystals

• Parul Chawla,
• Son Singh and
• Shailesh Narain Sharma

Beilstein J. Nanotechnol. 2014, 5, 1235–1244, doi:10.3762/bjnano.5.137

• luminescence intensity of the polymer to a considerable extent. The nanocrystals which lower the luminescence of the polymer the most are the best charge-transfer material from the polymer to nanocrystals. In our case, the best charge transfer capability is found for CZTSe nanocrystals. Further confirmation of

Surface processes during purification of InP quantum dots

• Natalia Mordvinova,
• Pavel Emelin,
• Alexander Vinokurov,
• Sergey Dorofeev,
• Artem Abakumov and
• Tatiana Kuznetsova

Beilstein J. Nanotechnol. 2014, 5, 1220–1225, doi:10.3762/bjnano.5.135

• of the stabilization on the QDs surface. It is known that the efficiency of QD luminescence increases a few days after synthesis because of the oxidation of the QDs surface [4]. In order to show that the increasing luminescence intensity is indeed a result of hydrolysis during precipitation, two

Optimizing the synthesis of CdS/ZnS core/shell semiconductor nanocrystals for bioimaging applications

• Li-wei Liu,
• Si-yi Hu,
• Ying Pan,
• Jia-qi Zhang,
• Yue-shu Feng and
• Xi-he Zhang

Beilstein J. Nanotechnol. 2014, 5, 919–926, doi:10.3762/bjnano.5.105

• luminescence-intensity CdS/ZnS core/shell QDs are suitable for optoelectronic devices and some biological applications [29][30][31][32]. Although CdS/ZnS QDs have been proposed for the use in biological applications, no research was so far reported on their biomedical applications. Our research has developed a

• material with a high bandgap energy of 3.66 eV, the use of ZnS leads to enhanced stability and luminescence intensity. The ZnS protective shell not only enhances the brightness of the QDs but also improves their stability in a biological environment. This study provides a useful synthetic route for

• and obstetrics, China-Japan Union Hospital of Jilin University, Changchun, Jilin, 130033, China 10.3762/bjnano.5.105 Abstract In this study, we report on CdS/ZnS nanocrystals as a luminescence probe for bioimaging applications. CdS nanocrystals capped with a ZnS shell had enhanced luminescence

Photoactivation of luminescence in CdS nanocrystals

• Valentyn Smyntyna,
• Bogdan Semenenko,
• Valentyna Skobeeva and
• Nikolay Malushin

Beilstein J. Nanotechnol. 2014, 5, 355–359, doi:10.3762/bjnano.5.40

• green band reduces in the integrated spectrum. Furthermore a new band with λmax = 480 nm appears. Note that here and in the subsequent figures the arrow indicates the direction of change of the luminescence intensity over time. The kinetics of the short-wavelength and long-wavelength luminescence bands

• = 0.11 eV with the holes in the valence band. This result is supported by the localization of the band at the edge of the absorption spectrum and the temperature dependence of the luminescence intensity in vacuum. The absorption spectrum of the CdS nanocrystals. The inset shows the spectrum of the first

Assessing the plasmonics of gold nano-triangles with higher order laser modes

• Laura E. Hennemann,
• Andreas Kolloch,
• Andreas Kern,
• Josip Mihaljevic,
• Johannes Boneberg,
• Paul Leiderer,
• Alfred J. Meixner and
• Dai Zhang

Beilstein J. Nanotechnol. 2012, 3, 674–683, doi:10.3762/bjnano.3.77

• patterns which were very different from those of the triangles on a silicon substrate. The contrast and luminescence intensity were considerably higher on glass. Only the patterns of the h = 40 nm, L ≈ 170 nm sized triangles in radial mode led to resembling patterns on silicon and glass (Figure 3b and

Fabrication and spectroscopic studies on highly luminescent CdSe/CdS nanorod polymer composites

• Jana Bomm,
• Andreas Büchtemann,
• Angela Fiore,
• Liberato Manna,
• James H. Nelson,
• Diana Hill and
• Wilfried G. J. H. M. van Sark

Beilstein J. Nanotechnol. 2010, 1, 94–100, doi:10.3762/bjnano.1.11

• concentration and absorbance, we conclude that the Beer–Lambert law holds until at least 0.2 wt %. The emission maximum is at 632 nm, yielding a Stokes shift of 13 nm. The luminescence intensity (Figure 2b) has a maximum for a nanorod (aspect ratio 3) concentration of 0.008 wt %. Absorption and emission spectra

• (SC400-2, Fianium Ltd., Southampton, UK) was used as an excitation light source (rep. rate 5 MHz, λex = 405 nm). Structure of CTA. a) Absorption intensity of the first exciton peak (619 nm), b) luminescence intensity of the emission maxima (632 nm) as a function of concentration in chloroform solution