Biomedical Optics Express
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2022
·Vol. 13
·期 7
·4021-4031
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IF 3.562
Jingjing Zhao,Jingjing Zhao,Shaohua Lu,Shaohua Lu,Julio Bastos-Arrieta,Julio Bastos-Arrieta,Cristina Palet,Yiling Sun,Renheng Wang,Zhengfang Qian,Shuting Fan
We presented a strategy for enhancing the sensitivity of terahertz glucose sensing with a hydrogel platform pre-embedded with Au nanoparticles. Physiological-level glucose solutions ranging from 0 to 0.8 mg/mL were measured and the extracted absorption coefficients can be clearly distinguished compared to traditional terahertz time domain spectroscopy performed directly on aqueous solutions. Further, Isotherm models were applied to successfully describe the relationship between the absorption coefficient and the glucose concentration (R2 = 0.9977). Finally, the origin of the sensitivity enhancement was investigated and verified to be the pH change induced by the catalysis of Au nanoparticles to glucose oxidation.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2022
·
IF 0.672
Bo Wang,Yiru Li,Wenhao Shu,Jianhua Zhang,Lianqiao Yang
An acetylcholinesterase biosensor was prepared with graphene-Au nanoparticle-transition metal carbide modified for the detection of organophosphorus pesticides. The outstanding electrical properties, specific surface area and biocompatibility of graphene and excessive metal carbide, especially under the modification of gold nanoparticles, make the biosensor highly sensitive. Cyclic voltammetry and differential pulse voltammetry were used to characterize the electrochemical catalysis of the biosensor: acetylcholinesterase/chitosan-transition metal carbides/gold nanoparticle/graphene/glassy carbon electrode. The prepared biosensor has a good linear relationship with dichlorvos, a common organophosphorus pesticide, from 2.26 × 10−3 to 2.26 × 10−8 mM and the limit of detection was 1.25 × 10−8 mM. Finally, the biosensor exhibits good stability, can be stored at room temperature for one month without significant performance degradation.
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Nanoscale
·
2022
·Vol. 14
·期 24
·8825-8832
·
IF 8.307
Fang Cheng,Wenjie Gu,Han Zhang,Chunyuan Song,Yunfeng Zhu,Feiyue Ge,Kuiming Qu,Hai Xu,Xue-Jun Wu,Lianhui Wang
Controlled synthesis of noble-metal nanoframes is of great interest due to their promising applications in plasmonics and catalysis. However, the synthesis is largely limited to a multiple-step approach involving selective deposition followed by selective etching. Here we report a facile and general strategy to synthesize Au–Ag nanoframes based on a direct galvanic replacement reaction between Ag nanoparticles and a gold(I) complex, sodium aurothiosulfate, without an extra etching process. The formation of Au–Ag nanoframes in our approach undergoes a continuous concaving and hollowing-out process from Ag templates, which is related to selective Au deposition and the Kirkendall effect. As a proof-of-concept, it was shown that Au–Ag nanoframes with different dimensions can be prepared from the corresponding Ag nanocolloids using our strategy. The prepared wire-like Au–Ag nanoframes show superior single-particle surface-enhanced Raman scattering due to the linear narrow nanogaps within the nanoframes. We believe this study signifies a new approach by mediating galvanic replacement to prepare noble-metal nanoframes with precise controllability, which may enable a variety of applications in plasmonics and catalysis.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 24
·19331-19343
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IF 2.779
Li Weiyin,Zhao Tongtong,Ding Lingling
Au@BSA was prepared at pH 8, pH 9, pH 10, pH 11, pH 11.4, and pH 12 as the working electrode of the non-enzymatic glucose sensor by biological template method. The six kinds of gold-cluster film working electrodes sintered by Au@BSA show golden color, especially the golden films corresponding to pH 8 and pH 12 are obvious. The gold-cluster films at pH 8, pH 9, pH 10, and pH 11 showed mono-layer gold nanoparticles, while the gold-cluster film at pH 11.4 showed porous structure. The gold-cluster film prepared at pH 12 presents a multi-layer 3D structure composed of a large number of gold nanoparticles. The linear detection range of the non-enzymatic glucose sensor prepared at pH 8 is the widest among the six sensors, and its sensitivity is also better than the other four sensors except the sensor prepared at pH 12. The sensor with the gold-cluster film-modified working electrode prepared at pH 12 show the highest sensitivity (330.002 μA mM −1 cm −2 ), because multi-layer 3D structure can bring more electric catalytic active site for this sensor. The electrochemical impedance spectroscopy showed that the specific surface area of the sensor prepared at pH 12 was much larger than that of the other five sensors. We provide a pH cycling method for once shaping preparation that can be extended to other metal films or metal-oxide films electrochemical interfaces. The Au@BSA non-enzymatic glucose sensor prepared in this paper is stable and can resist the toxicity of excessive chloride ions without losing activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chunping Su,Mengxi Cheng,Fan Tian,Fengxi Chen,Rong Chen
In this work, gold/bismuth oxychloride (Au/BiOCl) nanocomposites with different morphologies were successfully prepared by simple solvothermal method and sodium borohydride reduction method, which exhibited significantly efficient visible-light-driven photocatalytic disinfection for Staphylococcus aureus ( S.aureus ). Particularly, the flower-like Au/BiOCl nanocomposite showed the highest photocatalytic bactericidal performance among the prepared Au/BiOCl samples. The radical trapping experiments revealed that the hole was the main reactive species responsible for the inactivation of S.aureus over Au/BiOCl composite. The enhanced photocatalytic bactericidal effect could be attributed to the enhanced adsorption intensity of visible light that originated from the surface plasmon resonance (SPR) effect of Au, rapid transfer and space transport of hot electrons caused by the hierarchical structure of BiOCl layered compound. Furthermore, the Au/BiOCl coating prepared on stainless steel wire mesh via in-situ synthesis method exhibited excellent superhydrophilic/underwater superoleophobic performance, which endowed the coating with anti-oil-fouling in water. More importantly, compared with Au/BiOCl powder catalyst, the prepared Au/BiOCl coating with anti-oil-fouling also possessed high photocatalytic bactericidal activity and stable recycling performance.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 36
·18889-18894
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IF 14.511
Hongjing Wang,Lin Cui,Shuli Yin,Hongjie Yu,Kai Deng,You Xu,Xin Wang,Ziqiang Wang,Liang Wang
The integration of the thermodynamically favorable methanol oxidation reaction (MOR) with the hydrogen evolution reaction (HER) is a promising technique for energy-saving hydrogen production, and its efficiency mainly relies on the development of active bifunctional electrocatalysts. Here, we present an effective strategy to synthesize rambutan-like Au@PdRu nanocatalysts (Au@PdRu RNs) with a core–shell structure. The core–shell and multi-branched structures can offer a strong electronic effect and sufficient active sites. Therefore, Au@PdRu RNs show superior activity and durability for the HER and MOR. As bifunctional catalysts for HER–MOR electrolysis, Au@PdRu RNs only require 0.88 V at 10 mA cm−2, which is significantly lower than that for pure water electrolysis (1.69 V). This work proposes a highly promising bifunctional catalyst for energy-saving hydrogen production coupled with methanol oxidation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Baihui Wang,Xuemin Xia,Ruyi Tang,Huan Jiang,Mengyao Qi,Xia Zhang
The low temperature solvothermal method synthesized Cr 2 O 3 NPs has not only peroxidase activity, but also oxidase activity. Then, the oxidase activity of Cr 2 O 3 NPs is effectively shielded by nanogel immobilization using three monomers acrylamide, NIPAAM (N-isopropylacrylamide) and MBA (N,N′-methylene bisacrylamide) in HEPES (4-(2-hydroxyerhyl)piperazine-1-erhanesulfonic acid) buffer. Ultimately, the enzymatic activity of Cr 2 O 3 @nanogel/Au is significantly enhanced after doping Au NPs by SERS (Surface Enhanced Raman Spectroscopy) evaluation. A SERS strategy was proposed for the detection of H 2 O 2 by Cr 2 O 3 @nanogel/Au. The linear range was 10 −8 mol·L −1 -10 −1 mol·L −1 .
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Colloid and Interface Science Communications
·
2022
·
IF 5.633
Yuwen Wang,Xue Zhao,Jianbing Chen,Shuxing Zhou,Xianxi Zhang,Xinzhong Wang,Thomas Wågberg,Guangzhi Hu
The reduction of nitroaromatics is important in industrial wastewater treatment. However, the activity of an external catalyst is critical for the reaction. In this study, Au nanocrystals were anchored in situ on two-dimensional graphene oxide (GO), which had oxygen-rich groups on its surface. Oxygen-containing groups combined to form functional boron clusters through hydrogen bond interactions (BGO). The mild reducibility of a dodecahydrododecaborate anion cluster ( closo- [B 12 H 12 ] 2− ) made ultrafine Au nanocrystals uniformly disperse on GO (Au/BGO). 4-Nitrophenol and other nitro-aromatic hydrocarbons could be rapidly hydrogenated into aminoaromatic hydrocarbons by Au/BGO, and the hydrogenation efficiency was approximately 100%. It retained high catalytic activity after 16 catalytic cycles. Therefore, the proposed innovative preparation strategy and high catalytic activity indicate the advancement of closo- [B 12 H 12 ] 2− as a nucleation target for nanometals. This study provides a stable and efficient catalyst for the hydrogenation of nitroaromatics and an alternative approach for the preparation of supported nano-metals.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2022
·
IF 5.062
Jiaqian Li,Xiating Qi,Pengkun Ye,Mei Yang,Meng Xie
The combination of chemo-photothermal therapy applied to tumor ablation, overcoming the shortcomings of traditional cancer treatment and has become a research hotspot. Tungsten disulfide nanosheets (WS 2 ) are used as the core, and gold nanoparticles is incorporated into the surface layer of WS 2 (WS 2 /Au) by the sodium citrate reduction method, and then gold-doped tungsten disulfide surface is coated by lipids (WS 2 /Au-lipids). The biocompatibility and stability of this functional nanocomposite has been strongly improved under physiological conditions. The excellent photothermal conversion characteristics of WS 2 /Au-lipid has been verified by the photothermal experiment both in vitro and in vivo. Furthermore, the DOX loaded by WS 2 /Au-lipid has a dual response release curve of pH and NIR. The results of in vitro photothermal and chemotherapy combined treatment shows that the survival rate of the cell of the combined treatment group is obviously lower than the single treatment group. Through the investigation of photothermal performance in vivo, it has been found that after modification, the photothermal performance of the compound has been improved, and the drug can be targeted for delivery to the tumor site, making it more concentrated in cancer cells. In addition, in vivo study confirms that the combined treatment group has a more obvious therapeutic effect on tumors than the single treatment group, and no systemic toxicity was shown. It is an excellent carrier in many aspects and has unlimited development and prospects in the field of multiple cancer treatments.
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Li Fu,Xiancheng Liu,Ying Zeng,Qingqing Zhang,Bin Zhang,Xuwen Gao,Guizheng Zou
The electrochemiluminescence (ECL) bioassay is prominently carried out with the involvement of the coreactant. To remove the detrimental effects of the coreactant on the ECL of luminophores, herein, a promising ECL immunoassay strategy with biocompatible nanoparticles as the luminophore is proposed, which involves directly and electrochemically oxidizing the luminophore methionine-capped Au (Met@Au) nanocrystals (NCs) without the participation of any coreactant. Met@Au NCs are a kind of n-type nanoparticles, and they can be electrochemically injected with valence band (VB) holes around +0.80 and +1.10 V (vs Ag/AgCl). The electrochemically injected exogenous VB hole can recombine with the endogenous conduction band electron of Met@Au NCs and eventually bring out two coreactant-free and near-infrared ECL processes around 0.80 V (ECL-1) and 1.10 V (ECL-2). The intensity of coreactant-free ECL is primarily determined by the electrochemical oxidation-induced hole-injection process. ECL-2 is considerably stronger than ECL-1 and can be exploited for determining the carcinoembryonic antigen (CEA) in a sandwich immunoassay procedure with a linear range from 0.1 to 50 pg/mL as well as a limit of detection of 0.03 pg/mL (S/N = 3).
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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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Journal of the American Chemical Society
·
2021
·
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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