Journal of Nanostructure in Chemistry
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2014
·Vol. 4
·期 3
·1-8
·
IF 0
Li Lihua,Feng Dexiang,Fang Xian,Han Xiaowei,Zhang Yuzhong
In this work, we have developed a novel visual Hg 2+ sensor in aqueous solution using unmodified Au@Ag core–shell nanoparticles at room temperature, based on a redox reaction between Ag-shell and Hg 2+ . The prepared Au@Ag core–shell nanoparticles exhibited good monodispersity. In the presence of Hg 2+ , Hg 2+ was reduced into Hg (0) by Ag-shell, and deposited on the surface of Au-core to form Au–Hg alloys and caused nanoparticles aggregation, leading to the color changes of the solution from yellow to purplish red, and the surface plasmon resonance spectra of Au@Ag core–shell nanoparticles red shift. Under the optimal conditions, the visual sensor could selectively detect Hg 2+ as low as 0.4 µM with the naked eye and 5.0 nM by UV–vis spectra analysis methods. The designed sensor had several advantages: (1) the nanoparticles surface need not be functionalized. (2) The color change of the solution was in 2 s and could easily be observed with naked eyes. The visual sensor had been applied to detection of Hg 2+ in tap and lake water, which obtained satisfied result.
研究领域:
分析化学
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环境科学
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纳米技术
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Shihao Xiong,Tao Peng,Liangliang Huang,Rui wang,Beibei He,Jun Jin,Huanwen Wang,Yansheng Gong
Semiconductor photocatalytic nitrogen reduction reaction (PNRR) stands as a promising clean technique for ammonia synthesis, yet it confronts numerous challenges. In this study, Ag nanoparticle-modified Cu-doped Bi 2 WO 6 (ACB) porous composite materials with varying mass percentages were successfully synthesized using a solvothermal reduction approach. The incorporation of transition metal Cu effectively modulates the energy band position of Bi 2 WO 6 . Furthermore, the introduction of Ag nanoparticles significantly suppresses the recombination of photogenerated carriers. Without adding sacrificial agent, the photocatalytic nitrogen fixation yield of ACB reaches an impressive 184.93 μmol·g −1 ·h −1 , which is 5.44 times higher than that of pristine Bi 2 WO 6 . A comprehensive analysis of the experimental results reveals that the combined effect of Cu doping and Ag nanoparticle loading endows ACB with an increased exposure of active sites, thereby significantly enhancing its photocatalytic nitrogen fixation performance. This research offers a promising approach for the design of metal nanoparticle-supported catalysts for PNRR, holding significant implications for the advancement of other material systems.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2014
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IF 0
Fenfen Lu,Daohua Sun,Jiale Huang,Mingming Du,Feng Yang,Huimei Chen,Yingling Hong,Qingbiao Li
Herein, we reported the green synthesis of Ag–Pd alloy nanoparticles (NPs) using the aqueous extract of the Cacumen platycladi leaves as well as their application as catalyst for hydrogenation of 1,3-butadiene. The biosynthetic NPs were characterized to confirm the nature of alloy by UV–vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The possible functional groups responsible for the reduction and protection of NPs were identified through Fourier transform infrared spectroscopy (FTIR). The results revealed that biomolecules like saccharides, polyphenols, or carbonyl compounds were related to the reduction process, and the (NH)C═O groups were responsible for the stabilization of the NPs. Furthermore, the as-formed Ag–Pd bimetallic-supported catalysts especially Ag1Pd3/γ-Al2O3 was found to possess excellent catalytic performance toward hydrogenation of 1,3-butadiene. A butene yield of 84.9% was obtained, which was remarkably enhanced when compared with monometallic counterparts. Moreover, the activity of it maintained stability within 12 h of durable experiments.
研究领域:
材料科学
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催化化学
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纳米技术
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植物学
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Hua Li,Yumin Wang,Zhiqiang Hou,Xingyu Zhao,Xiao Miao,Guina Ren,Xiaotao Zhu
Solar-powered interfacial evaporation is emerging as a promising way to desalinate water and address global freshwater scarcity. The combination of a high water production rate and salt resistance capacity is highly desirable in the solar steam generation process, yet still challenging to realize. To overcome this problem, a suspended interfacial evaporator was developed using the Janus Ag/PDA textile. The Janus wettability of the Ag/PDA textile facilitated the unidirectional movement of water from the top to the bottom surface. The suspended type design of the Ag/PDA textile evaporator was capable of reducing heat dissipation to bulk water and enhancing localized heat generation significantly under solar illumination, thereby facilitating effective desalination. The steam generation rate reached an impressive 2.96 kg m -2 h −1 under one sun of solar irradiation. Remarkably, no salt crystallisation was observed on the evaporator surface during a 50 h continuous experiment in a highly saline environment (15 wt% NaCl). The remarkable salt inhibition capacity was attributed to three factors, including the salt rejection effect, the salt removal effect, and the salt dissolution effect. It is hoped that this work will inspire the development of a durable solar steam evaporator.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
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2025
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IF 10
Dengbang Zhao,Zhipeng Chen,Meng Wang,Mochen Jia,Jibin Zhang,Linyuan Lian,Yanbin Han,Xu Chen,Zhuangzhuang Ma,Ying Liu,Zhifeng Shi
Ion doping is an effective strategy to regulate the optical performance in metal halide perovskites for desirable light emission manipulations. In this work, a Mn 2+ and Ag + co-doping strategy is utilized to improve the luminescence in Cs 4 CdBi 2 Cl 12 quadruple perovskite. Mn 2+ and Ag + ions are proven to be incorporated into Cs 4 CdBi 2 Cl 12 lattice. Mn 2+ ions occupy Cd 2+ sites and Ag + ions occupy Cd 2+ sites or vacancies. The alloyed Mn 2+ ions bring efficient orange-red luminescence attributed to the energy transfer process from the host to Mn 2+ ions. A small amount of Ag + doping can optimize the band structure and increase the exciton binding energy, thus promoting efficient radiative recombination from d–d transition of Mn 2+ ions and boosting the PLQY up to 94.6%. Furthermore, Cs 4 Cd 0.75 Mn 0.25 Bi 2 Cl 12 :1.5%Ag + show good phase and emission stability in ambient environment and is employed in white light-emitting diodes with commercial blue and green phosphors on a near-ultraviolet LED chip. This work provides insights for understanding the composition-structure-property relationship in vacancy-ordered quadruple perovskites and designing highly efficient luminescent lead-free metal halides for solid-state light emitting applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
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2019
·
IF 2.883
Bing Zhang,Yejing Jia,Jing Wang,Honghong Chang,Zhihuan Zhao,Yan Cheng
Under the limitations of advanced instruments and professional operations, straightforward readouts play an increasingly vital role in immunoassays. Herein, a Ag 2 CO 3 @Ag nanocomposite-mediated colorimetric and photothermal immunoassay was developed to detect carcinoembryonic antigen (CEA). The Ag 2 CO 3 @Ag nanocomposites could oxidize 3,3’,5,5’-tetramethylbenzidine to form blue oxidation products (TMB ox ) due to the acidic dissolution of Ag 2 CO 3 under acidic conditions. TMB ox presented a strong photothermal effect driven by a near-infrared (NIR) laser. Therefore, TMB ox could act as a photothermal probe to convert immunoassay signals into thermal signals. The Ag 2 CO 3 @Ag nanocomposite was characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). Then, a sandwich-type immunoassay was built on the surface of a magnetic bead, and CEA was quantified using a common thermometer based on the photothermal effect. Under optimal conditions, the temperature increased with increase of CEA concentrations in the range of 0.1 ng/mL–5 ng/mL. More importantly, this system exhibited high selectivity, good repeatability and outstanding stability.
研究领域:
生物化学
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医学诊断
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 25
·期 1
·189-198
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IF 1.624
Feng Zhouzhou,Lv Xiang,Wang Tianhe
TiO 2 porous ceramic/Ag–AgCl composite was prepared by incorporating AgCl nanoparticles within the bulk of TiO 2 porous ceramic followed by reducing Ag + in the AgCl particles to Ag 0 species under visible light irradiation. The porous TiO 2 ceramic was physically robust and chemically durable, and the porous structure facilitated the implantation of AgCl NPs. Compared with the bare TiO 2 ceramic, TiO 2 porous ceramic/Ag–AgCl composite exhibited higher photocatalytic performance for the degradation of MO and RhB under visible light irradiation. The reaction rate constants k of MO and RhB degradation over TiO 2 porous ceramic/Ag–AgCl composite was respectively 6.25 times and 3.62 times higher than those recorded over the bare TiO 2 porous ceramic. The photocatalytic activity showed virtually no decline after four times cyclic experiments under visible light irradiation. Scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectra and X-ray photoelectron spectroscopy were used to characterize the TiO 2 porous ceramic/Ag–AgCl composite.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Yanping Zhu,Runliang Zhu,Lixia Yan,Haoyang Fu,Yunfei Xi,Huijun Zhou,Gangqiang Zhu,Jianxi Zhu,Hongping He
Herein, we have reported an effective strategy to solve the rate-limiting step in a heterogeneous Fenton reaction, i.e., the generation of Fe(II) from Fe(III), which also inevitably consumes a large amount of H 2 O 2 . For the first time, a novel heterogeneous photo-Fenton catalyst - Ag/AgBr/ferrihydrite (Ag/AgBr/Fh) was successfully developed by combing AgBr with ferrihydrite (Fh) and then in-situ generating Ag nanoparticles on the surface of AgBr/Fh. This strategy can introduce photo-generated electrons from semiconductor-based plasmonic photocatalysts to heterogeneous Fenton catalysts and significantly increase the efficiency to degrade contaminants. The presence of both AgBr and Ag nanoparticles was proved by a combination of structural characterization studies (i.e., XRD, SEM, TEM, and XPS). Under visible light irradiation, the generated Fe(II) on the samples and the degradation rate constants of bisphenol A (BPA) followed the same order: Ag/AgBr/Fh > AgBr/Fh > Fh, which could be attributed to the accelerated reduction of Fe(III) to Fe(II) by the photo-generated electrons from AgBr and Ag nanoparticles, and also profit from the strong electron trapping ability of Ag nanoparticles in separating the electron-hole pairs of AgBr. The Ag/AgBr/Fh system could produce more hydroxyl radicals (•OH), and its catalytic performance was less affected by decreasing H 2 O 2 concentration, which suggested a more efficient utilization of H 2 O 2 . The Ag/AgBr/Fh system exhibits relatively high photo-Fenton reactivity even at neutral pH. In addition, a much lower Fe 3+ dissolution indicates that a large portion of the contribution is from the direct heterogeneous Fenton reaction in this system.
研究领域:
环境科学
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催化
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光化学
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水处理
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Jianxin Liu,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
For detecting the active roles of ZIF-8 in composite photocatalyst , a novel Ag/AgCl/ZIF-8(50%) composite photocatalyst was designately prepared by anchoring Ag/AgCl nanoparticles on the surface of ZIF-8 with 50% content. The adsorption and photocatalytic performance of Ag/AgCl/ZIF-8(50%) were conducted by removal of Rhodamine B (RhB) from aqueous solution under dark and visible light irradiation (λ > 420 nm). The experimental results showed that the as-synthesized Ag/AgCl/ZIF-8(50%) exhibited higher photocatalytic activity than Ag/AgCl. The XRD , TEM , FTIR, DRS, VB XPS, ESR, N 2 adsorption isotherms and active species trapping experiments were used to characterize the performance of the composite photocatalyst. We found that the ZIF-8 in composite photocatalyst not only has the adsorption ability for RhB by its large specific area, but also has the ability for the formation of O 2 · − by an appropriate position of conduction band (CB). A reasonable reaction mechanism with a new perspective on the composite photocatalyst of Ag/AgCl/ZIF-8(50%) was proposed. This insight on the active roles of ZIF-8 in Ag/AgCl/ZIF-8(50%) may open a window for the use of MOF material in photocatalytic field.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 5
·813-823
·
IF 3.552
Wang Mengyun,Zhang Shengbo,Li Mei,Han Aiguo,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
Novel, hierarchical, flower-like Ag/Cu 2 O and Au/Cu 2 O nanostructures were successfully fabricated and applied as efficient electrocatalysts for the electrochemical reduction of CO 2 . Cu 2 O nanospheres with a uniform size of ∼180 nm were initially synthesized. Thereafter, Cu 2 O was used as a sacrificial template to prepare a series of Ag/Cu2O composites through galvanic replacement. By varying the Ag/Cu atomic ratio, Ag 0.125 /Cu 2 O, having a hierarchical, flower-like nanostructure with intersecting Ag nanoflakes encompassing an inner Cu 2 O sphere, was prepared. The as-prepared Ag x /Cu 2 O samples presented higher Faradaic efficiencies (FE) for CO and relatively suppressed H 2 evolution than the parent Cu 2 O nanospheres due to the combination of Ag with Cu 2 O in the former. Notably, the highest CO evolution rate was achieved with Ag 0.125 /Cu 2 O due to the larger electroactive surface area furnished by the hierarchical structure. The same hierarchical flower-like structure was also obtained for the Au 0.6 /Cu 2 O composite, where the FE CO (10%) was even higher than that of Ag 0.125 /Cu 2 O. Importantly, the results reveal that Ag 0.125 /Cu 2 O and Au 0.6 /Cu 2 O both exhibit remarkably improved stability relative to Cu 2 O. This study presents a facile method of developing hierarchical metal-oxide composites as efficient and stable electrocatalysts for the electrochemical reduction of CO 2 .
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Xiangyang Zhao,Lingling Wang,Yawei Wang,Xingyu Zhang,Rong Fang,Yue Zhou,Rui Guo,Xintong Zhang,Yichun Liu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are considered a promising new type of film cell, due to their rich elemental reservation and excellent photovoltaic performance. However, the deleterious defects at the heterojunction interface severely hinder charge transport, separation, and extraction, significantly limiting the photovoltaic performance of CZTSSe solar cells. In this study, a simple method involving the incorporation of Cd 2+ and Ag + dual-ion at the heterojunction interface was proposed to reduce interfacial defects. The results showed that Cd 2+ and Ag + dual-ion interface deposition effectively reduced the [2Cu zn + Sn zn ] harmful defects near the heterojunction interface and subsequently reduced the number of recombination centers in the interface. This led to improved carrier recombination at the interface. Meanwhile, the devices achieved a wider depletion width, which was more favorable for carrier collection. Ultimately, the conversion efficiency increased by 32.81 %. This simple interface dual-ion deposition strategy offers a promising strategy for further enhancing the efficiency of CZTSSe cells.
研究领域:
材料科学
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2025
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IF 6.5
Jing Zhang,Min Zha,Shanghua Xiao,Nina Filipczak,Satya Siva Kishan Yalamarty,Xiangping Wu,Chenkai Gong,Xiang Li
Objective Nanoparticles constructed with silver/manganese dioxide (Ag@MnO2) as the core, in conjunction with survivin siRNA (sis) and cyclo(RGD-DPhe-K) (Ag@MnO2-sis-c-L), were prepared for integrated tumor diagnosis and therapy.Methods Ag@MnO2-sis-c-L particles were prepared and characterized. The silver and manganese content were determined by inductively coupled plasma optical emission spectroscopy (ICP-OES). The stability of sis in the system was evaluated by incubation with 50% FBS before the agarose gel electrophoresis experiment. The in vitro photothermal conversion ability, cytotoxicity to 4T1 cells, and cellular uptake of preparations were evaluated. The dialysis technique was employed to determine the in vitro release profile of Ag and Mn from Ag@MnO2-sis-c-L under various pH conditions. The pharmacokinetic behavior and tissue distribution of silver in vivo were detected by ICP-OES. Animal model experiments were conducted to further evaluate the anti-tumor efficacy of Ag@MnO2-sis-c-L against breast cancer in combination with infrared irradiation.Results Our newly synthesized Ag@MnO2-sis-c-L nanoparticles displayed superior physicochemical properties. The combined application of these nanoparticles with photothermal therapy (PTT) exerted the strongest synergistic inhibitory effects on tumor growth. Survivin protein expression in tumor tissues were markedly suppressed following delivery of nanoparticles loaded with sis. Additionally, magnetic resonance imaging revealed the high imaging capability of hybrid nanoparticles.Conclusion This study supports the potential utility of Ag@MnO2-sis-c-L coupled with PTT in therapeutic and diagnostic imaging applications.
研究领域:
纳米医学
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肿瘤学
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生物材料
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分子影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）