JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Haibo Chen,Chengqi Zhao,Yu Li,Junyao Li,Wenrong Cai,Yong Kong,Zheng-Zhi Yin
Au nanoparticles (AuNPs) is first combined with d -methionine ( d -Met) through Au–S bond, and the obtained Au- d -Met was self-assembled with chitosan (CS) via electrostatic driving. Both d -Met and CS are important chiral sources, and therefore the resultant Au- d -Met/CS displays distinct chirality. Interestingly, the chirality of the Au- d -Met/CS can be reversed depending on the ratio of d -Met to CS, as revealed by circular dichroism spectra. Due to the high electrical conductivity of AuNPs as well as the intrinsic chirality of d -Met and CS, the resultant Au- d -Met/CS is used as the electrochemical chiral sensing platform for the discrimination of tryptophan (Trp) enantiomers. Although the Trp enantiomers can be successfully discriminated by the developed chiral sensing platform, the electrochemical signals of l -Trp and d -Trp can be reversed on the differential pulse voltammograms (DPVs) when different ratios of d -Met to CS are used, which can be ascribed to the reversible chirality of the Au- d -Met/CS complexes prepared by different ratios of d -Met to CS.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Peng Li,Baihui Wang,Mengyao Qi,Huan Jiang,Yifei Li,Xia Zhang
Tobramycin aptamer was adsorbed on the surface of gold nanoparticles (Au NPs) by van der Waals forces , hydrogen bonds , and other factors, limiting nanozyme peroxidase activity. Because tobramycin has a higher affinity for the tobramycin aptamer, including tobramycin in Au@Apts nanozymes was able to dislodge the aptamer from the surface of Au NPs and restore the catalytic activity of nanozymes. Raman spectroscopy of the enzyme-catalyzed product TMB ox can detect this shift in enzyme activity . The restored value of nanozyme activity increased with tobramycin concentration and had a good linear correlation in the concentration range of 10 −10 ∼10 −1 M with a detection limit of 2.04 × 10 −11 M. Aptamer biosensors are built using the SERS platform, which has the advantages of high sensitivity, high precision, and a wide detection range. It is prospectively employed in food safety and the detection of antibiotic residues.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Rengui Weng,Guohong Chen,Yifan Liu,Yuancai Lv,Chunxiang Lin,Xiaoxia Ye,Minghua Liu
A reductive cellulose-based aerogel (VTCA) was fabricated from cellulose by introducing valonea tannin through cross-linking reaction. VTCA owned high porosity of more than 96% with the average pore size of 30–50 µm, and it exhibited good adsorption performance for Au(III) at a wide pH values range (1−8) with the max adsorption capacity of 243.1 mg g −1 . VTCA showed good adsorption performance for Au(III) under the interference of various co-existing ions. The adsorption obeyed the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model, and temperature rise was favorable for adsorption. The adsorption-reduction mechanisms mainly involved electrostatic interaction, chelation adsorption and reduction. Au(III) could be effectively adsorbed onto the surface of VTCA by electrostatic attraction and chelation, and then reduced in situ to Au 0 by phenolic hydroxyl on tannic structure. This study provides a new adsorbent with the advantages of convenient preparation and high efficiency, and it has great application prospects in the enrichment and recovery of precious metals in waste liquid and the treatment of oxidized pollutants.
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Science China-Chemistry
·
2023
·Vol. 66
·期 6
·1722-1730
·
IF 9.6
Xiao Ruixue,Zhang Jie,Jiang Tingting,Zhou Yefan,Wang Yun,Xu Wenjia,Feng Yuhua
Precise structural control had attracted tremendous interest in nanosynthesis due to its great importance in tailoring the physical properties of nanomaterials. Here we report the synthesis of highly ordered CdS-Au-TiO 2 ternary Janus structure via template-protected sequential growth and conversion method. Arising from the integration of the rectification effect of Au-CdS and Au-TiO 2 Schottky barriers, the Janus configuration of the CdS-TiO 2 domains, the plasmonic effect of Au nanosphere, and the Z -scheme charge transportation, the CdS-Au-TiO 2 Janus structure showed high efficiency in the model photocatalytic degradation of methyl orange (MO) dye. Importantly, the well-defined structural order allowed the identification of the correlation between the structure and the catalytic performance. We believe that the synthetic control and the mechanism insights would help the design and synthesis of sophisticated nanostructures, and would eventually promote their applications in photocatalysis fields.
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Journal of the American Chemical Society
·
2021
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IF 15.419
Qixuan Zhong,Ji Feng,Bo Jiang,Yulong Fan,Qiao Zhang,Jinxing Chen,Yadong Yin
Creating highly branched plasmonic superparticles can effectively induce broadband light absorption and convert light to heat regardless of the light wavelength, angle, and polarization. However, their direct synthesis in a controllable manner remains a significant challenge. In this work, we propose a strain modulation strategy to produce branched Au nanostructures that promotes the growth of Au on Au seeds in the Volmer–Weber (island) mode instead of the typical Frank–van der Merwe (layer-by-layer) mode. The key to this strategy is to continuously deposit polydopamine formed in situ on the growing surface of the seeds to increase the chemical potential of the subsequent deposition of Au, thus achieving continuous heterogeneous nucleation and growth. The branched Au superparticles exhibit a photothermal conversion efficiency of 91.0% thanks to their small scattering cross-section and direction-independent absorption. Even at a low light power of 0.5 W/cm2 and a low dosage of 25 ppm, these particles show an excellent efficacy in photothermal cancer therapy. This work provides the fundamental basis for designing branched plasmonic nanostructures and expands the application scope of the plasmonic photothermal effect.
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Energy Technology
·
2021
·Vol. 10
·期 3
·2100841
·
IF 3.631
Xinyue Wang,Chi Chen,Shaoping Wu,Hongpeng Zheng,Yujie Chen,Hezhou Liu,Yongming Wu,Huanan Duan
LiFePO 4 is considered a promising cathode material for lithium-ion batteries for its high theoretical specific capacity and cycling stability. However, low electrical conductivity and Li-ion diffusion coefficient limit its electrochemical performances. Herein, gold nanorods (Au NRs) with a length of about 40 nm (aspect ratio of 7:1) are successfully prepared by a seed-mediated growth method. LiFePO 4 composite cathodes with 0.1/0.5/1 wt% Au NRs are compared with a pristine LiFePO 4 cathode, which shows that the addition of Au NRs can improve the electron and lithium-ion transport. Specifically, the addition of 1 wt% Au NRs increases the electrical conductivity and lithium-ion diffusion coefficient to 1.99 S cm −1 and 1.32 × 10 −14 cm 2 s −1 , respectively. The distribution of relaxation times analysis is carried out for the electrochemical impedance spectrum data to distinguish different electrochemical reactions within corresponding frequency regions. Particularly, LiFePO 4 with 0.1 wt% Au NRs exhibits a superior rate capability (133.7 mAh g −1 at 2C and 91.9 mAh g −1 at 5C) and stable cycling performance.
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LUMINESCENCE
·
2023
·Vol. 39
·期 2
·e4651
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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
·
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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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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Advanced Science
·
2023
·
IF 15.1
Liang Xiao,Benjin Chen,Wanni Wang,Tian Tian,Haisheng Qian,Xiaohu Li,Yongqiang Yu
Radiotherapy (RT), a widely used clinical treatment modality for cancer, uses high-energy irradiation for reactive oxygen species (ROS) production and DNA damage. However, its therapeutic effect is primarily limited owing to insufficient DNA damage to tumors and harmful effects on normal tissues. Herein, a core-shell structure of metal–semiconductors (Au@AgBiS 2 nanoparticles) that can function as pyroptosis inducers to both kill cancer cells directly and trigger a robust anti-tumor immune against 4T1 triple-negative murine breast cancer and metastasis is rationally designed. Metal-semiconductor composites can enhance the generation of considerable ROS and simultaneously DNA damage for RT sensitization. Moreover, Au@AgBiS 2 , a pyroptosis inducer, induces caspase-3 protein activation, gasdermin E cleavage, and the release of damage-associated molecular patterns. In vivo studies in BALB/c mice reveal that Au@AgBiS 2 nanoparticles combined with RT exhibit remarkable antitumor immune activity, preventing tumor growth, and lung metastasis. Therefore, this core-shell structure is an alternative for designing highly effective radiosensitizers for radioimmunotherapy.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-8
·
IF 5.833
Zhang Bing,Hu Xing,Jia Yejing,Li Jing,Zhao Zhihuan
A photothermal immunoassay using a thermometer as readout based on polyaniline@Au organic-inorganic nanohybrids was built. Temperature output is acquired due to the photothermal effect of the photothermal nanomaterial. Polyaniline@Au organic-inorganic nanohybrids were synthesized by interfacial reactions with high photothermal conversion efficiency. A sandwich structure of the immunocomplex was prepared on a microplate for determination of carcinoembryonic antigen (CEA) by polyaniline@Au organic-inorganic nanohybrids as nanolabel. The released heat based on light-to-heat conversion from the photothermal nanolabel under NIR irradiation is detectable using the thermometer. The increased temperature is directly proportional to CEA concentration. The linear range of the photothermal immunoassay is 0.20 to 25 ng mL −1 with determination limit of 0.17 ng mL −1 . Graphical abstract
Polyaniline@Au organic-inorganic nanohybrids with high photothermal conversion efficiency was synthesized as labels to construct photothermal immunosensor. The sandwich-type immunoassay was built on 96 hole plate based on specific binding of antigen and antibody. Carcinoembryonic antigen in sample was detected quantitatively by thermometer readout.
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CARBON
·
2021
·
IF 9.594
Junwei Liang,Yuxiang Liu,Zhichun Si,Guodan Wei,Duan Weng,Feiyu Kang
Utilizing photocatalysts to split water into H 2 and H 2 O 2 simultaneously is an ideal but challenging process to obtain clean H 2 energy and high valuable H 2 O 2 . Most of the photocatalysts currently studied for the overall water splitting are converting water into H 2 and O 2 , resulting in further need of gas separation. Here, we reported a photocatalyst which can utilize the nano-Au based localized surface plasmonic resonance (LSPR) effect to produce H 2 and H 2 O 2 simultaneously. Nitrogen doped graphene quantum dots (N-GQDs) pieced together into large graphene through a catalytic process by chloroauric acid, in which dodecahedron nano-Au particles can also be obtained concurrently. Then Au wrapped up by graphene can be in situ formed with good interfaces. Photocatalytic activity tests revealed that the as prepared graphene@Au catalysts show efficient photocatalytic overall water splitting activity with a H 2 evolution rate of 65.6 μmol g −1 h −1 and H 2 O 2 generation rate of 49.7 μmol g −1 h −1 . This work provides a feasible route for the facile fabrication of graphene through the bottom-up polycondensation of N-GQDs by amide bonds and new insights into the synthesis of photocatalysts for overall water splitting into H 2 and H 2 O 2 .
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