JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 6
·1655-1666
·
IF 2.496
Fang Wei,Chen Hui,He Xuan,Li Weixin,Zhang Wenhao,Shen Yue,Chen Xiaodong,Zhao Lei
In this work, we report a 3D biomass foam absorber by uniformly loading plasmonic Au nanoparticles (Au-NPs) on carbonized rice husk porous substrate for solar vapor generation. The organic bubbles were simultaneously used as templates to construct porous channels and as carriers to introduce Au-NPs. Owing to the characteristic plasma heating effects, Au-NPs can be as additional heat spots for vapor generation to enhance the solar-thermal conversion effect at visible waves. The 3D porous absorber enables convenient water transport and high light absorption of ~ 94.6%. The solar vapor evaporation efficiency is ~ 84% in pure water and ~ 75% in 15 wt% NaCl solution under 1 kW m −2 .
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JOURNAL OF FOOD AND DRUG ANALYSIS
·
2025
·Vol. 33
·期 4
·451
·
IF 3
Zhang Yun,Wu Qiong,Gao Hui,Zhang Hua,Miao Xiang-Min
Evidence had accumulated that serotonin (5-HT), a hormone and neurotransmitter, was not only involved in a variety of different physiological and central nervous system functions but also in the development and manifestation of psychiatric diseases. Here, DNA tetrahedron-Au NPs-GO for enhanced fluorescence sensor was designed for detecting serotonin. Au NPs-GO was used as a fluorescence quencher, while fluorophore-labeled DNA tetrahedron was used as a donor, resulting in fluorescence resonance energy transfer (FRET) from the fluorophore to Au NPs-GO (signal off). With the strong binding ability of aptamer to serotonin, S5 was released from Aptamer: S5 duplex, then reacted with the tail of DNA tetrahedron (DTNs), followed by the formation of three double stranded DNA products in the tail of DTNs, bringing in signal readout responses (signal on). Consequently, a reliable, sensitive and selective sensor was obtained for one-step quantificative detection of serotonin from 50 pM to 200 nM with a detection limit of 16.8 pM. Furthermore, satisfactory stability, reproducibility, specificity and good recovery efficiency in human serum samples revealed that the proposed sensor could be served as a prospective tool for serotonin detection.
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OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Hua-Long Du,Nuerguli Kari,Ben Li,Qi Wang
The fiber Surface plasmon resonance (SPR) sensor based on titanium dioxide(TiO 2 ) and Au nanoparticles (Au-NPs) sensitization is offered as a practical means of increasing the sensitivity and figure of merit (FOM). Through finite element simulation and experimental testing, it is found that in TiO 2 with high dielectric constant and high dielectric conductivity, the carrier movement is fast and consumption is low, which enhances the photocurrent signal and leads to charge redistribution, thus enhances the electric field; while the Au-NPs will stimulate the stronger Localized Surface plasmon resonance (LSPR) phenomenon, and both of them will undergo electric field resonance coupling. The sensitivity of the sensor is higher because its surface electric field is 3.67 times stronger than the conventional Au film sensor. When exposed to external conditions, the sensitivity can reach 9715 nm/RIU within the refractive index (RI) at 1.33213–1.34055, which is 4.69 times higher than a conventional Au film sensor. The FOM can reach 57.8 RIU -1 , which is 2.05 times higher than the conventional Au film sensor. In addition, TiO 2 and Au-NPs on the surface of the sensor are less prone to collapse, and the stability test results show that the relative standard deviation (RSD) is 0.5929 %, which exhibits good reliability and stability. The structure of the sensor is very simple, relatively easy to fabricate, and has good applicability in the field of biochemical testing.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 3
·3067-3074
·
IF 1.798
Li Jiali,Yan Luting,Wang Huili,Wang Haiwei,Chen Xiao,Wang Lei,Wu Meng
Gold nanoparticles (NPs) were deposited directly on an indium tin oxide (ITO) substrate using the successive ionic layer adsorption and reaction (SILAR) method by chemically reducing precursor metal salts with dopamine aqueous solution. The Au NPs decorated on the ITO substrate were approximately spherical, with an average particle size of about 40 nm, which varied in accordance with different SILAR cycles, reactant concentrations, and intermediate media. Strong surface plasma resonance characteristics were confirmed by the surface-enhanced Raman scattering and absorption spectra of the Au NPs. Through this simple method, glucose sensors based on this kind of Au NPs/ITO exhibited a sensitivity of 524 μA mM −1 cm −2 , which is higher than any other similar study.
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TALANTA
·
2023
·
IF 6.1
Shuyan Ruan,Ru Liu,Xi Chen,Qian Huang,Chongxin Xiao,Ruiyun You,Luqiang Huang,Yunzhen Liu,Jingbo Chen,Xiufeng Xiao,Qingqiang Lin,Yudong Lu
As a reactive oxygen species (ROS), excessive production of H 2 O 2 contributes to the development of several diseases such as, inflammation, cancer, and respiratory diseases. Supplementation with endogenous or exogenous antioxidants can scavenge ROS and reduce the oxidation of cellular molecules, thus alleviating the generation of diseases. Therefore, the determination of H 2 O 2 content and its antioxidant activity is of great importance in disease diagnosis and treatment. In this paper, a ratiometric SERS sensor with a flexible cellulose membrane was designed for quantitative detection of H 2 O 2 and assessment of antioxidant activity. First, gold seeds were reduced on bacterial cellulose membrane (BCM) and Au NPs were smoothly deposited on the bacterial cellulose membrane (BCM) using halides to reduce the reduction potential in the growth solution to form a flexible BCM@Au NPs SERS substrate. Afterwards, the oxidation of H 2 O 2 was used to convert 3-mercaptophenylboronic acid (3-MPBA) to the corresponding phenol form 3-hydroxyphenylethanol (3-HTP). The change of substance resulted in a good linear relationship between the intensity ratio corresponding to the two Raman shifts of 881 cm −1 and 995 cm −1 and the H 2 O 2 concentration with a detection limit of 0.0186 μM. This opens up a new method for the detection of H 2 O 2 with high sensitivity and accuracy. In addition, this SERS platform was successfully used for the determination of antioxidant activity. It is promising to be applied to disease diagnosis and efficacy evaluation.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Huihui Xie,Qixu Hu,Junzi Huang,Min Liu,Peng Wei,Yahong Xie,Ying Qi
The plasmonic property of metal nanoparticles could improve the photovoltaic performance of perovskite solar cells (PSCs). In this work, the plasmonic Au nanoparticles (Au NPs) was introduced into the SnO 2 electron transport layer (ETL), improving the photovoltaic performance of perovskite solar cells (PSCs) based on carbon electrode by approximately 26.28 %. The device structure is the FTO glass/SnO 2 /perovskite (CH 3 NH 3 PbI 3 )/carbon electrode. By optimizing the volume of Au NPs, the photocurrent of PSCs increased from 18.49 mA cm −2 to 23.25 mA cm −2 by 25.74 %, and the power conversion efficiency (PCE) from 10.96 % to 13.84 % by 26.28 %. The improved performance of the device is due to the local surface plasmon resonance (LSPR) of Au NPs, which enhances the optical absorption in the perovskite layer and improves the conductivity of the electron transport layer (ETL). Fluorescence spectroscopy showed that PSCs containing Au NPs reduced the recombination of electron and hole between the interface of ETL and perovskite and could transmit charge faster than PSCs without Au NPs. These results indicate that the plasmonic metal nanoparticles can greatly improve the efficiency of PSCs.
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LUMINESCENCE
·
2023
·Vol. 39
·期 2
·e4651
·
IF 2.9
Weiwei Yuan,Shuhuai Li,Xionghui Ma,Chaohai Pang,Yuwei Wu,Mingyue Wang,Bei Li
The luminescence performance of fluorescent reagents plays a crucial role in fluorescence analysis. Therefore, in this study, a novel bi-ligand Zn-based metal–organic framework, Au nanoparticle (NP) fluorescent material was synthesized using a hydrothermal method with Zn as the metal source. Simultaneously, a DNA aptamer was introduced as a molecular recognition element to develop a Zn-based MOF@Au NPs/DNA aptamer fluorescent probe for the ultra-trace detection of thiamethoxam residues in agricultural products. The probe captured different concentrations of the target molecule, thiamethoxam, through the DNA aptamer, causing a conformational change in the DNA aptamer and bursting the fluorescence of the probe, therefore establishing a fluorometric method for thiamethoxam detection. This method is highly sensitive due to the excellent luminescence properties of the Zn-based MOF@Au NPs, and the DNA aptamer can specifically recognize thiamethoxam, offering high selectivity. The linear range of the method was 2.5–6000 × 10 −11 mol L −1 , with a detection limit of 8.33 × 10 −12 mol L −1 . This method was applied to the determination of actual samples, such as bananas, and the spiked recovery rate was found to be in the range 84.05–109.07%. Overall, the proposed probe has high sensitivity, high selectivity, and easy operation for the detection of thiamethoxam residues in actual samples.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Chengyun Zhang,Haoran Wu,Yu Xing,Qingxin Yin,Jianxia Qi,Qingyan Han,Wei Gao,Jun Dong
Using the capillary force-assisted self-assembly method, the enhancement system for photoluminescence was simply and effectively constructed, consisting of a layer of Au nanoparticle arrays uniformly assembled on the inner wall of the capillary and a further layer of hexagonal rare-earth doped nanoparticle core-shell structures assembled on its surface. It was found that the solution had a significant effect on the self-assembly process of the enhanced system, and the use of anisole as a solvent was more conducive to the construction of a homogeneous rare-earth doped nanoparticle film. In addition, the density of Au nanoparticles also modulated the enhancement effect of up-conversion luminescence and the optimal particle density conditions were determined by comparison. And the overall enhancement effect of surface plasmon resonance assisted up-conversion luminescence was analyzed in terms of the correlation of photoluminescence with the changes in excitation intensity and emission lifetime, as well as the significant increase in the red-to-green ratio. The results contribute to the construction of effective regulatory structures for up-conversion luminescence, which has important applications in the field of spectral sensing technology.
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BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2024
·
IF 2.5
He Wang,Haidu Yuan,Jianhao Zhang,Wenjing Yan
Bacterial infections are becoming a significant threat to global human health due to the growing prevalence of biofilm-related infections and the rise in antibiotic resistance. D/ l -cysteine functionalized chiral gold nanoparticles (D/P-Au NPs or L/P-Au NPs) have demonstrated a potent antibacterial effect against E. coli , while the mechanism remains to be elucidated through additional research. Threonine deaminase (TD) is a crucial enzyme involved in branched-chain amino acid (BCAA) biosynthesis in E. coli and is involved in cysteine's antimicrobial effects. This study investigated the interaction between chiral Au NPs (D/P-Au NPs or L/P-Au NPs) and TD as well as its effect on enzyme activity. It demonstrates that chiral Au NPs interact with TD through hydrophobic forces, forming a ground state complex that induces changes in the secondary structure of TD and reduces enzyme activity in a concentration-dependent manner. We found that the exogenous supplementation of isoleucine and valine (2 mg/mL) significantly reduced the antibacterial activity of chiral Au NPs, especially for L/P-Au NPs. The proteomics results indicate that the expression of ilvA and ilvB was down-regulated after L/P-Au NPs treatment, which would interfere with the synthesis of BCAAs. These results demonstrate that chiral Au NPs cause cell death of E. coli partly due to inhibition of TD enzyme activity and the synthesis of branched-chain amino acids.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 66
·e202202256
·
IF 5.02
Niuniu Zhang,Xia Wu,Kangjia Lv,Yujie Chu,Haimei Qin,Dongdi Zhang,Guan Wang,Jingyang Niu
Graphical An excellent 2D photocatalyst was synthesized by loading Au nanoparticles and CdS quantum dots on niobate nanosheets. This CdS/Au/HNb 3 O 8 photocatalyst not only increased the photocatalytic hydrogen evolution rate by 254 times compared with the pure niobate nanosheet, but also showed outstanding photocatalytic performance for oxidative self-coupling of benzylamine and degradation of organic dyes. Niobate nanosheets have aroused widespread interest in recent years for their prospects in catalysis. The exploration of 2D niobate catalysis with stable and efficient properties is still the focus in chemistry and materials science. Herein, the successful fabrication of 2D CdS/Au/HNb 3 O 8 catalyst is demonstrated which revealed efficient photocatalytic properties in H 2 evolution, oxidative self-coupling of amines to imines, and degradation of dyes. Especially the assembled architecture can give a rate of 5.85 mmol ⋅ g −1 ⋅ h −1 of photocatalytic H 2 evolution, an ∼254-fold enhancement, compared with bare HNb 3 O 8 nanosheets under identical conditions. In accordance with density functional theory (DFT) and X-ray adsorption fine structure (XAFS) analyses, the vast improvements are benefited from efficient migration and separation of charge carriers. Besides, the surface plasma resonance (SPR) effect of Au NPs enhances the light harvesting capacity and boosts the generation of hot electrons, efficiently improving the visible-light absorption.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Zhang Lei,Weng Yi-jin,Liu Xiao,Gu Wen,Zhang Xia,Han Lei
Surface Enhanced Raman Scattering (SERS) has been widely applied in many research fields such as biological detection and chemical analysis. However, for the common Au nanoparticles, it’s too hard to guarante the three aspects: the great enhanced effect, the controllable aggregation and the uniformity of nanoparticles, the environmental friendliness and biocompatibility of nanoparticles. In this paper, phytate acid (IP6)-coated Au nanoparticles (IP6@Au NPs) are more stable and have a higher enhancement factor than Au nanoparticles. In order to achieve the uniformity of the spherical IP6-coated@Au nanoparticles (IP6@Au NPs), IP6 was used as a soft template. In the presence of IP6, IP6@Ag nanoparticles were first synthesized by reducing AgNO 3 with trisodium citrate, then IP6@Au NPs were obtained by reducing HAuCl 4 with Ag nanoparticles. The IP6@Au NPs exhibit excellent Raman signal enhancement by using p-aminothiophenol (4-ATP) as the probe molecules. The effects of Fe 3+ on the performance of IP6@Au NPs SERS substrates were also studied. The results show that SERS has the best enhancement effect when adding proper amount of Fe 3+ (0.56 PPM), and the limit of detection was 10 −7 M 4-ATP.
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ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Lu-Lu Qu,Da-Wei Li,Li-Xia Qin,Jin Mu,John S. Fossey,Yi-Tao Long
A novel surface-enhanced Raman scattering (SERS) nanosensor was developed by modifying oxidized cytochrome c (Cyt c) on gold nanoparticles (Au NPs) for the sensitive and selective determination of intracellular superoxide anion radical (O2•–). On the basis of the differences in the SERS spectra between the oxidized and reduced form of Cyt c, this nanosensor could be employed to investigate O2•– concentration by measuring the SERS spectra of the reduced Cyt c. Using this SERS nanosensor, a detection limit of 1.0 × 10–8 M for O2•– could be attained. Additionally, the selectivity of the SERS nanosensor for O2•– was examined, showing that other reactive oxygen species (ROS) and biologically relevant species did not influence the detection of O2•–. More importantly, the nanosensor could be delivered to the living HeLa and normal human liver cells and permitted the concentration of O2•– to be monitored in real time and in a noninvasive manner, which indicates that this nanosensor will be suitable for the qualitative and quantitative analysis of O2•– in biosystems, thus leading to a greater understanding of oxidative-stress-related diseases at a cellular level.
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