COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Yong Cheng,Feifei Sun,Qichun Feng,Qiang Zhao,Yinghua Zhou
In this study, we describe the successful fabrication of silver nanoparticles (AgNPs) within Ag(I)-AMTD metal-organic gel matrix. The resulting composite (AgNPs@Ag(I)-AMTD) was characterized by 1 H NMR, IR, SPR, SEM, TEM, EDX, XPS, and XRD. This material exhibited a remarkable and durable activity for the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) and other nitroarenes by NaBH 4 in aqueous solution. This method affords a facile means of embedding the active silver nanoparticles within the metal-organic gel matrix and offers the necessary stability of the resulting silver nanostructure for catalytic transformation.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 79
·75384-75389
·
IF 3.289
Liang-Liang Wu,Li-Ying Wang,Zheng-Jun Xie,Feng Xue,Chi-Fang Peng
This paper reported that the peroxidase-like activity of DNA–Ag/Pt nanoclusters (NCs) can be inhibited selectively by Hg2+. The interaction between Hg2+ and the DNA–Ag/Pt NCs was discussed through characterization by TEM, DLS and XPS, etc. It was found that the integration of both Hg0 and Hg2+ to the DNA–Ag/Pt NCs resulted in the DNA–Ag/Pt NCs aggregation and the decrease of Pt2+ content on the DNA–Ag/Pt NCs surface, which finally impaired their catalytic activity. Based on the above mechanism, a colorimetric detection for Hg2+ was developed with a detection limit (LOD) of 5.0 nM and a linear range from 10 nM to 200 nM. The method was highly selective toward Hg2+ over other common metal ions, low-cost and simple, which facilitated the application of detecting Hg2+ in tap water.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2017
·
IF 1.025
Ning Zhou,Meng Yuan,Dongsheng Li,Deren Yang
A time- and energy- saving solution-based chemical precipitation method was developed to synthesize leaf-like CuO nanostructures. The morphology and size of the leaf-like CuO nanostructures could be simply manipulated by controlling the type and concentration of precursors, and the oriented attachment mechanism is responsible for the formation of leaf-like shape. With the concurrent reduction reaction and at appropriate concentration, CuO/Ag microspheres could be prepared and the growth mechanism is proposed. These two structures could serve as effective photocatalyst for the degradation of rhodamine B under visible light irradiation in the presence of hydrogen peroxide. Moreover, compared to pure CuO nanostructures, the photodecomposition activity of CuO/Ag microspheres increases by 42.9% due to plasmon-enhanced light absorption.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shiyue Bian,Chao Shen,Yuting Qian,Jiyang Liu,Fengna Xi,Xiaoping Dong
Sulfur-doped graphene quantum dots (S-GQDs) with bright blue emission have been prepared by a facile one-pot hydrothermal treatment. A specific compound, 1,3,6-trinitropyrene, which has a mother nucleus structure similar with graphene, was chosen as the carbon source and 3-mercaptopropionic acid (MPA) was employed for S-doping and carboxyl groups modification. The synthesized S-GQDs were characterized by atomic force microscopy (AFM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and fluoscence (FL) spectrum. Results indicated that S-GQDs possessed single layer graphene structure with mean size of about 2.5 nm and presented an excitation-independent photoluminescence behavior with maximum excitation/emission wavelength at 360/450 nm, respectively. The sulfur-doping of GODs drastically improved their electronic and chemical properties, which afforded the S-GQDs a sensitive response to Ag + ions. Furthermore, the S-GQDs were successfully explored as a sensing probe for Ag + detection with high sensitivity and selectivity. A wide linear range of 0.1-130.0 μM with a low detection limit of 30 nM was obtained. The facile preparation method and the high performace of the as-prepared S-GQDs present promising potential for their applications in sensing, biological imaging and catalysis.
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Long Wu,Xiaoyan Xiao,Kun Chen,Wenmin Yin,Qin Li,Pan Wang,Zhicheng Lu,Jing Ma,Heyou Han
Abstrcact Highly sensitive and selective detection of specific DNA sequences is of great importance in clinical diagnosis, environmental and food monitoring, but it still remains challenges to develop a facile method for real sample detection in aqueous solution. Here, a simple and recyclable surface enhanced Raman scattering (SERS) sensor was constructed for Bacillus thuringiensis (Bt) special gene fragment detection by Fe 3 O 4 magnetic beads (MBs) and Au–Ag core-shell nanorods (Au@Ag NRs). A hairpin DNA with sulfhydryl and biotin was attached to Au@Ag NRs as indicator, and MBs with streptavidin (SA) were acted as the capture probe. On the basis of the biotin–SA specific interaction, target sequences were first hybridized with the hairpin DNA and exposed the biotin. Subsequently, the Au@Ag NRs were captured by the streptavidin modified MBs, which reduced the suspended NRs and led to the change of Raman intensity . Under the optimal conditions, the SERS intensity revealed a good linearity with Bt transgene fragment ranging from 0.1 pM to 1 nM with a detection limit of 0.14 pM (S/N=3). To demonstrate the specificity of the strategy, the single-base mismatch in DNA was discussed in the SERS assay. The results showed that the sensitivity and accuracy of the proposed method was acceptable in DNA detection, revealing a great potential in special gene detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yingying Xu,Mengyao Li,Yingjiu Zhang,Hongzhang Song,Haoshan Hao
A series of Bi 2 Sr 2 Co 2 O y (BSCO), Bi 2 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BSBCCO), Bi 1.9 Cu 0.1 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BCSBCCO) and Bi 1.8 Ag 0.2 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BASBCCO) ceramic samples were prepared to optimize the thermoelectric properties of BSCO by high entropy doping combined with Cu/Ag doping. High entropy doping improves the carrier mobility significantly, due to a sintering effect in liquid phase and an additional conduction path. Cu/Ag acceptor doping increases the carrier concentration and Seebeck coefficients. Both them enhance the electrical transport performance of doped samples effectively. Specially, the random distribution of several different cations caused by high entropy doping and Cu/Ag doping can enhance the phonon scattering, which greatly reduces the thermal conductivity of doped samples. Finally, the thermoelectric figure of merit ( ZT ) value of the BASBCCO sample is improved to 0.36 at 923 K on the basis of high entropy doped BSBCCO ( ZT = 0.28 at 923 K), which is twice that of the pristine sample.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xingtang Xu,Guang Sun,Xueling Wang,Yanwei Li,Jianliang Cao,Yan Wang,Hari Bala
Recently, the detection of acetone by using a gas sensor fabricated with metal oxide semiconductors has stimulated intense research enthusiasm, owing to its promising application in the noninvasive diagnosis of diabetes by monitoring human exhaled breath. In this work, a potential acetone sensor was fabricated by comodification of the nanosheets-assembled ZnCo2O4 hierarchical microspheres (HMSs) with MoO3 and Ag nanoparticles (NPs). The ZnCo2O4 HMSs were synthesized via a solvothermal route and then sequentially modified with MoO3 and Ag NPs via immersion, calcination, and photoreduction routes. The results of gas sensing measurement indicated that after modification with MoO3 and Ag, a continuous improvement of acetone sensitivity was realized on the ZnCo2O4 sensor. At the optimal working temperature of 260 °C, the response of the best Ag/MoO3/ZnCo2O4 sensor to 50 ppm of acetone was 7.23, which was about 3.3 and 1.4 times higher than that of ZnCo2O4 and MoO3/ZnCo2O4, respectively. Apart from the higher response, the selectivity and response speed of the Ag/MoO3/ZnCo2O4 sensor were also improved. The results of density functional theory calculations showed that the enhanced absorbability of ZnCo2O4 for acetone after modification with MoO3 and Ag should be responsible for the improved acetone sensitivity and selectivity of the Ag/MoO3/ZnCo2O4 sensor.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Junzhuyan Wang,Chenjie Zhang,Zhao Qi,Minmin Xu,Yaxian Yuan,Jianlin Yao
Photocatalytic degradation and low-concentration detection of tetracycline (TC) are often limited by the high recombination ratio of carriers and low sensitivity. Herein, we synthesized Bi4Ti3O12 nanosheets (BiTO NSs) by a molten salt method and decorated them with silver nanoparticles (Ag NPs) to obtain BiTO/Ag heterojunctions for degradation via piezo-photocatalysis and detection by surface enhanced Raman spectroscopy (SERS). The synergetic effect originating from piezoelectricity and surface plasmon resonance (SPR) can improve the photon utilization, resulting in an enhancement in the catalytic performance and detection sensitivity. The reduction of TC by BiTO/Ag was as high as 92.1% within 120 min in a solution of 10 ppm, and the limit of detection (LOD) can reach 0.01 ppm. This work offers a new strategy to achieve the effective degradation and high-sensitivity detection of TC by a BiTO/Ag bifunctional heterojunction material.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanna Ding,Yanli Zhou,Cuilan Feng,Maotian Xu,Daosheng Liu
An in situ confinement polymerization technology was developed to construct nitrogen-doped carbon tubes (NCT) with a uniform distribution of silver nanoclusters (AgNCs). Specifically, polydopamine (PDA) was utilized as a good stabilizer and carbon precursor by using curcumin as a template to induce the self-polymerization of dopamine in the presence of Ag+. Then, the AgNC@NCT materials were formed by template removal and subsequent carbonization. The prepared AgNC@NCT materials exhibited excellent stability, catalytic activity, and electrochemical properties due to their high carbonization and silver content. The AgNC@NCT-modified electrode had strong catalytic oxidation activity, specific surface area, and charge transfer efficiency for the detection of d-tryptophan (d-Trp). The constructed electrochemical sensor demonstrated a good linear range (0.1–100 μM) with a low detection limit (0.009 μM) for d-Trp detection. The sensor also had excellent selectivity, high stability, and repeatability. More importantly, it could be used for the evaluation of d-Trp levels in human serum with high accuracy. This method provided a strategy for the detection of d-Trp in biological samples, which had a good application prospect in daily clinical tests.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Yutian Wang,Jingyuan Guo,Letu Siqin,Chenjun Yang,Lei Wang,Shuyu Li,Ruijian Liu,Hongmei Luan,Chengjun Zhu
Defect modulation is one of the key factors in determining the performance of solar cells, and the presence of defects tends to adversely affect carrier recombination and transport, thus having a direct impact on both cell stability and efficiency. Ag doping can modulate the defects, but in-depth studies on the mechanism of the effect are needed. Therefore, an in-depth study of the effect of Ag incorporation on the defect modulation mechanism of Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is of great practical significance for understanding the mechanism of action of Ag doping and further optimising the cell performance. In this study, (Ag x Cu 1-x ) 2 ZnSn(S,Se) 4 (0 ≤ x ≤ 1) (ACZTSSe) solar cells were successfully prepared by N, N-dimethylformamide (DMF) solution, which have the characteristics of reducing defects and enhancing photovoltaic performance. After the introduction of Ag, the absorber formed a crystal structure with few holes and penetrating top and bottom. And the electrical performance of the solar cell is significantly improved, J 0 is reduced from 4.6 × 10 −5 A/cm 2 to 2.7 × 10 −6 A/cm 2 , and its contribution to the photovoltaic conversion efficiency (PCE) improvement reaches 142%. This indicates that the introduction of Ag helps to optimize the quality of the absorber, thereby reducing the concentration of interfacial and bulk defects. It also reduces carrier recombination and improves carrier lifetime from 0.86 ms to 1.75 ms. Ultimately increasing our cell efficiency from 7.55% to 10.64% when the Ag content reached 5%. These results clearly show that we have successfully achieved the modulation of defects in CZTSSe solar cells by Ag doping.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Ming-Kun Ke,Yuan Min,Shu-Chuan Mei,Hou-Wei Zeng,Zhao-Hua Wang,Tian-Wei Hua,Jie-Jie Chen,Gui-Xiang Huang,Han-Qing Yu
5-Hydroxymethyl-2-furancarboxylic acid (HMFCA) is an important feedstock in chemical and pharmaceutical industries . Its production through aerobic conversion of 5-hydroxymethylfurfural (5-HMF) has promising prospects but is challenged by the over-oxidation. In this work, we develop a refined Pt-Ag co-catalytic strategy to tailor the selectivity of 5-HMF’s aerobic oxidation. By simple in situ addition of AgNO 3 to the thermal catalytic system of Pt nanoparticles , the main products of 5-HMF oxidation could be shifted from 2,5-furandicarboxylic acid (FDCA) to HMFCA with an ultrahigh selectivity of over 99 %. Density functional theory calculations demonstrate that such strategy could alter the HMFCA adsorption sites from Pt to Ag sites and prevent the oxidation of hydroxymethyl group . In addition, this strategy can be extended to other Ag species, such as AgCl, Ag 2 O and AgO. This work provides insights into the Pt-Ag synergistic catalysis and opens up a simple avenue to control the product selectivity for biomass refinement.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Tao Gai,Jiaolai Jiang,Shaofei Wang,Ling Zhang,Yiming Ren,Zhen Qin,Qian Wu,Jun Zhang,Junsheng Liao
Uranium is an essential nuclear material in civilian and military areas; however, its extensive application raises concerns about the potential safety issues in the fields of environmental protection and nuclear industry. In this study, we developed an Ag/Ag 2 O–COF (covalent-organic framework) composite SERS substrate to detect uranyl ions (UO 2 2+ ) in environmental aqueous solutions. Herein, the strong SERS effect of uranyl adsorbed in Ag/Ag 2 O composite and the high adsorption efficiency of COF TpPa-1 were combined to realize the trace detection of uranyl ions. This method displayed a linear range of 10 −8 mol L −1 to 10 −6 mol L −1 with the detection limit of 8.9 × 10 −10 mol L −1 for uranyl ions. Furthermore, common metal cations and oxo-ions hardly affected the SERS detection of uranyl, which is helpful for the trace analysis of uranyl in natural water samples. Although the proposed strategy is deployed for uranyl detection, the reusable and high-efficiency system may be expanded to trace detection of other substance with Raman activity.
✓ 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）