ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Yanlin Lv,Lili Zhu,Heng Liu,Yishi Wu,Zili Chen,Hongbing Fu,Zhiyuan Tian
A new type of fluorescent probe capable of detecting Ag + and Hg 2+ in two independent channels was developed in the present work. Specifically, in CH 3 CN–MOPS mixed solvents with CH 3 CN/MOPS ratio (v/v) of 15/85, this type of probe fluoresced weakly, and the addition of Ag + remarkably induced fluorescence enhancement of the probe. In CH 3 CN–MOPS mixed solvents with the percentage of CH 3 CN increased up to 65%, the probe was highly fluorescent and addition of Hg 2+ dramatically induced the fluorescence quenching. Thus, using such single-fluorophore-based probe and tuning the polarity of the mixed solvent, Ag + , and Hg 2+ can be detected in independent channels with high selectivity and sensitivity. As a result, the mutual interference usually encountered in most cases of Ag + and Hg 2+ sensing owing to the similar fluorescence response that these two ions induced, can be effectively circumvented by using the probes developed herein.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 5
·1307-1315
·
IF 6.641
Bin Zeng,Fei Chen,Zhenyang Liu,Zhongyuan Guan,Xu Li,Feng Teng,Aiwei Tang
Herein, we demonstrated a seed-mediated growth method for the synthesis of ternary AgInS2 (AIS) and quaternary Ag–In–Zn–S (AIZS) nanocrystals (NCs) by means of a partial cation exchange with In3+ and Zn2+ ions. Binary Ag2S NCs with different sizes were synthesized first, which then acted as the seeds to prepare different-sized AIS NCs through the incorporation of In3+. The formation mechanism of AIS NCs was studied in terms of the temporal evolution of the morphology and crystal structure, and the heterostructured Ag2S-AIS NCs were formed as intermediates during the growth process of AIS NCs. Variation in the Ag/In feeding ratios from 1 : 1 to 1 : 3 led to a broad tuning of the optical band gap and photoluminescence (PL) maximum of AIS NCs, in which very small-sized AIS NCs with a tetragonal phase were obtained. Subsequently, the incorporation of Zn2+ into AIS NCs resulted in the widening of the optical band gap and the shift of the PL maximum to higher energy with the enhancement of the absolute PL quantum yields (PLQYs). When the reaction temperature was increased, the PL emission maximum could be tuned from 2.04 to 2.33 eV and the absolute PLQYs could be tuned from 16% to 58%. Time-resolved PL spectroscopy was used to study the PL decay dynamics of the AIS and AIZS NCs, and the PL emission was related to the recombination of the surface-related states, intrinsic defects and donor–acceptor (D–A) pairs. The ternary and quaternary Ag-based semiconductor NCs have long-lived excitons, which may have promising applications in the field of energy conversion.
研究领域:
材料科学
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纳米技术
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光学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
·
IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
研究领域:
材料科学
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电化学
·
催化
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纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yinlong Cheng,Pengyu Meng,Liansheng Li,Lixiang Zhong,Chengzong Yuan,Jie Chen,Qinghua Liang
The chlor-alkali process is critical to the modern chemical industry because of the wide utilization of chlorine gas (Cl 2 ). More than 95 % of global Cl 2 production relies on electrocatalytic chlorine evolution reaction (CER) through chlor-alkali electrolysis. The RuO 2 electrocatalyst serves as the main active component widely used in commercial applications. However, oxygen evolution reaction (OER) generally competes with CER electrocatalysts at RuO 2 electrocatalyst owing to the intrinsically scaling reaction energy barrier of *OCl and *OOH intermediates, leading to decreased CER selectivity, high energy consumption, and increased cost. Here, the effect of Ag doping on selective CER over RuO 2 electrocatalysts prepared by a sol–gel method has been systematically studied. We found that Ag-doping can effectively improve the Faradaic efficiency of RuO 2 electrocatalyst for CER. Furthermore, the improved CER selectivity of Ag-doped RuO 2 electrocatalysts is highly dependent on the Ag-doping concentration. The optimized Ag 0.15 Ru 0.85 O 2 electrocatalyst displays an overpotential of 105 mV along with a selectivity of 84.64 ± 1.84 % in 5.0 M NaCl electrolyte (pH = 2.0 ± 0.05), significantly outperforming undoped one (142 mV, 72.75 ± 1.52 %). Our experiments and density functional theory (DFT) calculations show electron transfer from Ag + to Ru 4+ suppresses *OOH intermediates desorption on Ag-doped RuO 2 , enabling improved CER selectivity. Such designs of Ag-doped RuO 2 electrocatalysts are expected to be favorable for practical chlor-alkali applications.
研究领域:
化学工程
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材料科学
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电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2024
·Vol. 11
·期 6
·065403
·
IF 1.8
Hongfeng Lin,Jianhong Chen,Zhongyan Zhang,Yuxu Wang
In the current study, Fe3O4/Ag nanohybrids demonstrating high efficiency in liver cancer ferroptosis therapy and MR imaging were synthesized using a facile one-pot approach. Subsequently, their morphology, chemical composition, structure, Fenton reaction activity, and magnetic resonance (MR) contrast effect were systemically assessed. Importantly, the in vitro studies demonstrated that the Fe3O4/Ag nanohybrids had a high therapeutic efficiency in treating liver cancer cells and performed exceptionally well during T2-weight MR imaging. Correspondingly, these Fe3O4/Ag nanohybrids demonstrate significant potential for use in the field of biomedicine.
研究领域:
肿瘤学
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纳米医学
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生物医学工程
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影像医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Tengda Shi,Zhexiang Tang,Pei Liang,Xiubing Zhang,De Zhang,Qinchao Shao,Jie Huang,Zhi Yu,Yongquan Xu,Hongping Chen
The spectroscopy of surface-enhanced Raman scattering (SERS), with its high sensitivity and specific chemical fingerprinting, has received increasing attention. A stable substrate is extraordinarily important for the trace detection of the SERS technique, but the challenge of SERS substrate production with high stability and uniformity still imposes the unavoidable barriers. In this paper, we design a multilayer core–shell-nanostructured ZrO2@Ag@SiO2 nanoparticle through liquid extraction. First, we regulated the usage of AgNO3 (1 wt %) to obtain Ag@SiO2 which is silver coated with uniform distribution; on the surface of silica, the number of silver particles is abundant. Then, we discussed the influence when different concentrations of zirconium propoxide are added on the zirconia layer’s thickness. Then, we applied FDTD simulation to explain the position of SERS “hotpots” with and without ZrO2 coating. We have found that the detection capability of ZrO2@Ag@SiO2 can be up to 10–9 M for 4-ATP; with ZrO2@Ag@SiO2 SERS substrates exposed to the atmospheric environment for up to 30 days, we could still obtain the excellent SERS signal performance contributed by the good chemical stability of ZrO2, when ZrO2 is coated on the surface of Ag@SiO2, the zirconia layer formed has a protective role . These experimental results have indicated that the outer zirconia layer could prevent the silver surface from being oxidized, ensuring its stability , which is quite crucial for the applied SERS.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Lili Ling,Yawei Feng,Hao Li,Yao Chen,Jieya Wen,Jian Zhu,Zhenfeng Bian
In this work, Ag/TiO 2 composite was prepared by photo-reduction method. The study of photocatalytic degradation of different organic pollutants found that microwave can enhance the photocatalytic degradation rate . Further studies have shown that photo-generated holes are the main active species involved in photocatalytic degradation. Under microwave irradiation , silver nanoparticles can not only promote the charge separation process, but also enhance the adsorption of organic pollutants on the surface of TiO 2 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Peng Du,Lan Ma,Yinghui Cao,Di Li,Zhenyu Liu,Zhenxin Wang,Zaicheng Sun
Surface enhancement Raman scattering (SERS) is a powerful technique for detecting low-concentration analytes (chemicals and biochemicals). Herein, a high-performance SERS biosensing system has been created by using highly stable Ag@oxides nanoplates as enhancers. The Ag nanoplates were stabilized by coating a uniform ultrathin layer of oxides (SiO2 or TiO2) on the Ag surface through a simple sol–gel route. The thin oxide layer allows the plasmonic property of the original Ag nanoplates to be retained while preventing their contact with external etchants. The oxides provide an excellent platform for binding all kinds of molecules that contain a COOH group in addition to a SH group. We demonstrate that Ag@oxides have high performance with respect to the typical SERS molecule 4-ATP, which contains a typical SH group. Ag@oxides also can be directly employed for the SERS detection of amino acids. The highly stable Ag@oxides nanoplates are believed to hold great promise for fabricating a wide range of biosensors for the detection of many other biomolecules and may also find many interesting opportunities in the fields of biological labeling and imaging.
研究领域:
纳米材料科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiaoyu Bai,Wenyi Ma,Peng Liu,Qian Sun,Kai Zhang,Aixiang Li,Jian Pan,Zijian LYu
Efficiency and sustainability of catalytic thin-film nanocomposite (TFN) membranes are crucially important for the reverse-osmosis performance of thin film composite (TFC) membranes in many fields. Herein, Ag@UiO-66-NH 2 catalytic nanoparticles were fabricated and incorporated into the polyamide active layer through by covalent bond via the interfacial polymerization (IP) method. Polyamide TFN membranes with high efficiency, sustainable catalytic degradation of Rhodamine B (RhB), and excellent self-cleaning performance were prepared conveniently. The 0.8 wt % Ag@UiO-66-NH 2 composite membrane has excellent permeability stability, and the flux recovery rate can reach 81.6% after 7 runs. In addition, the degradation rate of RhB can reach 99.6% by using this membrane. More importantly, the degradation efficiency of 250 mL RhB solution can still reach 94.5% after 7 cycles of catalytic test. The degradation effect of RhB by the TFN membranes was enhanced significantly owing to the synergistic effect of the adsorption and catalytic properties of Ag@UiO-66-NH 2 nanoparticles. Moreover, it provides a universal method for preparing TFN membrane with a catalytic active layer, which can be applied in other fields of catalytic film by replacing Ag NPs with other particles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Boqiang Gao,Yu Pan,Qianqian Chang,Zhonghua Xi,Hu Yang
In this work, the sheet-like BiVO 4 with a higher exposure ratio of {0 1 0} facets was synthesized by the addition of TiCl 3 , and the ratio of (0 4 0)/(0 1 1) on {0 1 0}BiVO 4 was 2.85 times higher than that of normal decahedral BiVO 4 . Accordingly, the {0 1 0}BiVO 4 /Ag/CdS all-solid-state Z-scheme heterojunction was further constructed by photoreduction of Ag and chemical deposition of CdS on the well prepared {0 1 0}BiVO 4 successively. The performance and mechanism of {0 1 0}BiVO 4 /Ag/CdS in synergistic adsorption-photodegradation of fluoroquinolones (FQs) from water were investigated in detail. The adsorption-photodegradation could be divided into three processes: adsorption, surface degradation, and solution degradation, with the rate constants of 0.118, 0.029, and 0.012 min −1 , respectively. Accordingly, the adsorption was a rapid process due to the combined CdS in this composited photocatalyst had a high affinity to FQs to achieve an adsorption equilibrium on the surfaces<30.0 min. Besides, {0 1 0}BiVO 4 /Ag/CdS had a better separation efficiency of photogenerated electron-hole pairs than BiVO 4 /Ag/CdS, because the enriched {0 1 0} facets of {0 1 0}BiVO 4 caused more BiVO 4 /Ag/CdS ternary structure formed, and>90% photodegradation efficiency for five FQs ( C 0 = 0.062 mmol/L) was thus obtained within 60.0 min. The radical trapping and EPR results showed that holes and superoxide radicals were the main active species for FQs photodegradation. In summary, {0 1 0}BiVO4/Ag/CdS achieved an enhanced performance in synergistic adsorption and photodegradation of organic contaminants from water, and a talented photocatalyst was thus provided in water and wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 10
·2129-2139
·
IF 5.773
Houlin Wang,Shuang Liu,Zhen Zhao,Xin Zou,Minghan Liu,Wei Liu,Xiaodong Wu,Duan Weng
Different Ag/CeO2 catalysts with uniform structures and diverse surface oxygen vacancy (VO-s) contents were synthesized via a modified solution combustion method. Based on the results of Raman spectroscopy, H2-TPR and isothermal soot oxidation, it was suggested that even with gaseous O2 participating in the reaction, ceria surface sites around the catalyst–soot contact points can still be reduced by soot gradually. This interfacial reduction led to the generation of extra VO-s without changing the oxygen vacancies in the bulk of CeO2. Notably, this VO-s dynamic change and the insufficient O2− regeneration/delivery further resulted in the activation and deactivation of Ag/CeO2 during reaction with soot. This means that both the existence of ceria VO-s and its dynamic change during reaction may have a crucial influence on catalyst behavior. By further exploring these activity variations, the VO-s content, catalyst–soot contact condition and extra oxygen supplier were proved to be the three most important structural factors behind the soot oxidation activity of all the ceria-based catalysts. In this sense, Ag/CeO2 catalysts with appropriate morphology and moderate initial VO-s content may exhibit good activity for soot oxidation.
研究领域:
催化化学
·
环境科学
·
材料科学
·
表面化学
·
能源化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Ying Zhang,Xin Liu,Yonggang Zhao,Zhineng Zhou,Yufei Chen,Congyan Xu,Xinghuan Hu,Xu Su,Lang Wu,Xiaoyu Jin,Shurong Wang
In recent years, there is significant interest in Cu 2 SnS 3 (CTS) thin film solar cells owing to the eco-friendly nature and abundant elemental composition. However, the efficiency prepared in laboratory settings for these solar cell remains relatively low, primarily due to serious open-circuit voltage losses. Cation substitution is one of the strategies to alleviate this problem. In this work, Ag and Ge dual-cation substitution in CTS is proposed, which occupy partial Cu and Sn lattice sites respectively. Investigation reveals that substituting Cu with part Ag increases the band gap slightly, promotes grain growth, and improves crystallinity of CTS films. Simultaneously, Ge incorporation shifts the conduction band upwards to some extent, while reducing grain boundaries, due to increasing the grain size. As a result, the incorporation of 6 % Ag resulted in an optimal efficiency (PCE) of 2.78 %. Furthermore, employing dual-cation substitution with 6 % Ag and 6 % Ge is employed, the CTS device achieved an optimal efficiency of 3.15 %. This work develops the synergistic effect of Ag and Ge dual-cation substitution in CTS device and confirms that this approach can improve device performance, thus providing new research ideas for advancing the development of CTS device.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）