Nano Research
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2015
·Vol. 8
·期 11
·3621-3629
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IF 7.01
Li Yanrui,Li Leilei,Gong Yunqi,Bai Song,Ju Huanxin,Wang Chengming,Xu Qian,Zhu Junfa,Jiang Jun,Xiong Yujie
A Z-scheme is a promising approach to achieve broad-spectrum photocatalysis. Integration of TiO 2 with another semiconductor with a band gap of ∼1.0 eV would be ideal to harvest both ultraviolet and visible-near infrared light for photocatalysis; however, most narrow-bandgap semiconductors have straddling band structure alignments with TiO 2 , constituting an obstacle to forming the Z-scheme for photocatalytic hydrogen production. In this communication, we demonstrate Ag 2 S as a model system where the energy band upshift of the narrow-bandgap semiconductor that shares an interface with a metal can overcome this limitation. To fabricate the design, we developed a unique approach to synthesize Ag 2 S–Ag–TiO 2 hybrid structures. The obtained ternary hybrid structures exhibited dramatically enhanced performance in photocatalytic hydrogen production under full-spectrum light illumination. The activities were significantly higher than the sum of those of Ag 2 S–Ag–TiO 2 structures under λ < 400 nm and λ > 400 nm irradiation as well as those of their counterparts under any light illumination conditions.
研究领域:
材料科学
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能源化学
·
环境科学
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高影响因子
MATERIALS RESEARCH BULLETIN
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2026
·
IF 5.8
Hui Liu,ZongXin Zhang,Hui Zhao,Zhongzheng Gao,Tao Wu,Xixi Zhu,Qingyun Liu
C@MoS 2 @Ag 2 S heterojunction nanozyme was constructed. • C@MoS 2 @Ag 2 S presented exceptional peroxidase-like activity. • p-nitrophenol was efficiently degraded by C@MoS 2 @Ag 2 S through activating H 2 O 2 and PDS. In this study, a carbon-coated MoS 2 @Ag 2 S (C@MoS 2 @Ag 2 S) heterojunction nanozyme with superior peroxidase-like activity is prepared via heterojunction pre-construction followed by carbonization. The kinetic parameters toward H 2 O 2 are determined to be K m = 1.02 mM and V max = 38.08 × 10 −8 M·s −1 , and toward 3,3′,5,5′-tetramethylbenzidine (TMB) are K m = 0.14 mM and V max = 60.35 × 10 −8 M·s −1 . Notably, its affinity for H 2 O 2 is substantially higher than that of natural horseradish peroxidase (HRP, K m = 3.7 mM), and the catalytic efficiency (V max ) is also superior. Enhanced performance stems from three-component synergy improving electron transport, charge separation, and ROS generation. Through synergistically activating persulfate (PDS) and H 2 O 2 , SO 4 • ⁻ , •OH, and 1 O 2 are generated, which collectively degrade PNP, achieving 90% removal in 40 min. This study offers theoretical guidance for the controllable synthesis of biomass-derived carbon/metal sulfide heterojunction nanozyme and the design of dual-oxidant synergistic activation systems for degradation of organic pollutants. Download: Download high-res image (151KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chentao Hou,Hualin Liu,Mingyuan Zhang,Liping Wang
The TiO 2 has the problems of low utilization of visible light and high photogenerated carrier recombination rate. The photocatalytic activity of TiO 2 can be significantly improved by introducing F ion and narrow band gap material Ag 2 S. When F ions are present on the {001} surface of TiO 2 , surface F ions drive positively charged holes across the {001} surface, creating a synergistic effect that promotes the separation of electron-hole pairs. During the sample composite process, a certain amount of Ag will be precipitated to form an all-solid Z-type heterojunction structure of Ag 2 S, Ag and F-TiO 2 , which can improve the electron-hole separation efficiency. The results of XPS characterization confirmed the migration of F ion and the precipitation of Ag. The Ag 2 S/F-TiO 2 composite sample was referred to as AT for short, and the corresponding ratio was 1:10,1:20,1:30,1:40, the optimal sample AT 1:20 degraded 95.6% tetracycline hydrochloride within 2 hours. This work simultaneously realizes TiO 2 self-modification (synergistic effect of F ion migration and TiO 2 {001} crystal surface) and composite modification (formation of all-solid Z-type heterojunction), a new idea of studying TiO 2 self-modified cooperative heterostructures is proposed, and the good application potential of AT nanocomposites in photocatalytic water treatment technology is demonstrated.
研究领域:
材料科学
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环境科学
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Shuqin Chen,Wanfu Lan,Dapeng Yang,Jingying Xu,Yikun Hu,Hetong Lin,Liang Feng
Dimethoate (DIM) is one of the most extensively applied organophosphorus pesticides (OPs), which is used to boost farm productivity due to its high insecticidal efficacy. However, the excessive use of DIM can result in the extensive contamination of soil, groundwater and food. Monitoring of DIM in environmental and food samples is crucial in view of its potential health risks and environmental hazards from excessive residues. The expensive equipment and complex operations for current detection methods greatly limit their practical applications. Herein, a self-powered photoelectrochemical (PEC) sensing platform based on Ag 2 S/SnS 2 photoanode, iron-doped cobalt borate (CBFO) photocathode, and molecularly imprinted polymers (MIPs) was proposed for the detection of DIM. The molecularly imprinted polymers at CBFO photocathode endow the self-powered PEC sensor with high selectivity. The Ag 2 S/SnS 2 photoanode enhances the efficient of electron transfer between the photoanode and photocathode, contributing to the high sensitivity of PEC sensor. The self-powered molecularly imprinted PEC sensor exhibits outstanding sensitivity and selectivity for DIM at concentrations from 1 × 10 −2 to 1 × 10 5 nM with a detection limit of 5.9 pM. Excellent recoveries (95.4 ± 2.6 %, 98.4 ± 2.3 %, 106.3 ± 3.3 %) were achieved in spiked crown pear samples, indicating that the molecularly imprinted PEC sensor is capable of detecting DIM in real samples. This research provides a novel simple, fast, highly selective and sensitive self-powered molecularly imprinted photoelectrochemical sensing platform for detection of DIM. The fabricated PEC sensor offers a promising candidate for the detection method of organophosphorus pesticides residues, which is of great significance for the fields of food safety and environmental protection.
研究领域:
分析化学
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环境科学
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食品安全
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PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yang Xuan,Zhou Su,Meng Guan,Yinan Zhao,Wenliang Zhang,Yating Gao,Xinyu Bian,Mingfan Zhang,Donghui Zhao,Shubiao Zhang
Subcellular targeted therapy has recently emerged as a significant approach in cancer treatment. Mitochondria, as crucial organelles that not only provide cellular energy but also play roles in cell differentiation, signal transmission, reactive oxygen species production, apoptosis, and calcium homeostasis, are considered potential targets for cancer therapy. Silver sulfide quantum dots (Ag2S QDs) have demonstrated exceptional capabilities in near-infrared fluorescence and photoacoustic imaging as well as photothermal treatment. Therefore, the development of Ag2S QDs with mitochondrial-targeting ability is of particular significance. Herein, we developed a simple method for synthesizing aqueous-phase Ag2S QDs using lipoic acid, an enzymatic substrate involved in cellular respiration, as a ligand and mitochondrial-targeting molecule. These Ag2S QDs, which exhibit excellent water solubility and biocompatibility, can be produced in a single step and act as a mitochondrial-targeted theranostics. By adsorbing doxorubicin (DOX), we successfully created multifunctional nanoprobes called Ag2S-DOX. In vitro and in vivo experiments demonstrated that Ag2S-DOX was suitable for fluorescence and photoacoustic dual-mode imaging as well as synergistic mitochondrial-targeted chemotherapy and photothermal treatment, offering a promising strategy for tumor therapy.
研究领域:
生物医学工程
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纳米医学
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肿瘤学
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xiao-Shuai Zhang,Jian-Shuang Wei,Jian-Wei Chen,Kai Cheng,Fang Zhang,Ghazal Ashraf,Yan Li,Xiao-Lin Hou,Ruo-Yun Zhang,Yong-Guo Hu,Xiao-Quan Yang,Wei Chen,Bo Liu,Yuan-Di Zhao
In this study, a hollow Ag 2 S/Ag nanocomposite shell comprised of elemental Ag and compound Ag 2 S was synthesized, after loading the sonosensitizer and CT contrast agent, a multifunctional HASAIC nanoprobe was obtained for the first time by wrapping it with a thermosensitively supported lipid bilayer. The elemental Ag in the probe can catalyze H 2 O 2 to O 2 to relieve the hypoxic environment at the tumor site and improve the effect of sonodynamic therapy. Moreover, the hollow Ag 2 S/Ag nanocomposite shell avoids the key limitation of pure Ag shell during the process of catalyzing H 2 O 2 to O 2 , the pure Ag shell will dissolve and could not be used for photothermal therapy (PTT) and photoacoustic imaging (PAI), and enables the probe to use stable Ag 2 S to employ PTT and PAI though solving the problem of hypoxia. The synergy combination of the nano size (70 nm) HASAIC probe, low cytotoxicity, good safety, and high biocompatibility boost up the tumor killing capability. Because of the high efficiency, the HASAIC nanoprobe has been employed for real-time ( in vitro and in vivo) CT and PAI imaging in a 4T1 tumor-bearing mouse. Laser and ultrasound irradiation demonstrated a higher survival rate of HASAIC-injected mice compared to a probe without elemental silver, thereby indicating the high efficiency of our diagnosis and treatment probe.
研究领域:
纳米技术
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癌症治疗
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医学成像
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生物医学工程
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高影响因子
JOURNAL OF APPLIED PHYSICS
·
2019
·Vol. 125
·期 18
·
IF 2.328
Zhang Kaixuan,Xu Na,Jia Mengyu,Li Ruoping,Huang Mingju
Noble-metal-based surface-enhanced Raman spectroscopy (SERS) substrates can be employed as catalysts capable of generating hot electrons to drive chemical reactions of target molecules adsorbed on their surface. However, the localized surface plasmons excited from pure noble metals generally exhibit relatively low hot-electron utilization efficiency with the reactants owing to charge carrier recombination. This problem can be solved by integrating heterogeneous structures with the noble metal. Herein, we describe the fabrication of bifunctional SERS substrates by constructing Au@Ag, Au@Ag 2 S, and Au@SiO 2 core-shell nanoparticles and evaluate the effects of the three heterostructures (Au cores encapsulated by shells composed of metal, semiconductor, or insulator) on the hot-electron transfer efficiency by in situ monitoring of the catalytic dimerization of p -nitrophenol to form p , p ′-dimercaptoazobenzene under 632.8 nm laser illumination. The developed SERS strategy opens up new opportunities for exploring hot-electron-induced reactions as well as providing a useful reference for photocatalyst selection.
研究领域:
材料科学
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光催化
·
纳米技术
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高影响因子
TALANTA
·
2021
·
IF 6.057
Xiao-Jing Liao,Hui-Jin Xiao,Jun-Tao Cao,Shu-Wei Ren,Yan-Ming Liu
Photoelectrochemical (PEC) immunoassay is a burgeoning and promising bioanalytical method . However, the practical application of PEC still exist some challenges such as the inevitable damage of biomolecules caused by the PEC system and the unsatisfactory sensitivity for biomarkers with low abundance in real sample. To solve the problems, we integrated the cosensitized structure of Ag2S/ZnO nanocomposities as photoelectrode with photogenerated hole-induced chemical redox cycling amplification (CRCA) strategy to develop a split-type PEC immunosensor for cardiac troponin I (cTnI) with high sensitivity. Initially, the immunoreaction was carried out on the 96-well plates in which alkaline phosphatase (ALP) could catalyze ascorbic acid 2-phosphate (AAP) to generate the signal-reporting species ascorbic acid (AA). Subsequently, the AA participated and the tris (2-carboxyethyl) phosphine (TCEP) mediated chemical redox cycling reaction took place on the photoelectrode, thus leading to signal amplification. Under the optimized conditions, the immunosensor demonstrated a detection limit (LOD) of 3.0 × 10 −15 g mL −1 with a detection range of 1.0 × 10 −14 g mL −1 to 1.0 × 10 −9 g mL −1 for cTnI. Impressively, the proposed method could determine the cTnI in human serum samples with high sensitivity and satisfactory accuracy. Considering the virtues of the photoelectrode and the chemical redox cycling strategy, the method would hold great potential for highly sensitive biosensing and bioanalysis .
研究领域:
生物分析
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医学诊断
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 21
·19541-19551
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IF 2.195
Xiang Di,Hou Ying,Zhu Jiaqi,Yang Ming
In this study, we report a facile cation-exchange method to synthesize three different metal@dual sulfide hybrid nanostructures with enhanced photocatalytic properties. Starting from clusters of Au@Ag 2 S with a poorly crystalline shell, excess amounts of Cd 2+ , Zn 2+ and Pb 2+ are used to promote the thermodynamically unfavored cation-exchange under elevated temperature. The change of shell compositions accompanies the disassembly of Au@Ag 2 S clusters into monodisperse ternary core–shell nanostructures with modulated optical properties. Interestingly, it is found that Au@Ag 2 S–CdS outperforms Au@Ag 2 S–ZnS and Au@Ag 2 S–PbS in the visible-light-driven photodegradation of methylene blue, which can be largely attributed to the improved shell crystallinity, enhanced visible light absorption and appropriate band alignment for charge transfer.
研究领域:
材料科学
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纳米技术
·
光催化
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RARE METALS
·
2026
·Vol. 45
·期 7
·e70439
·
IF 12.1
Jinyong Hu,Songming Dou,Xinyao Liu,Bohao Liu,Xiongxiong Xue,Yong Zhang
en This link goes to a English section zh This link goes to a Chinese section Light-activated gas sensors hold significant potential in environmental monitoring and smart Internet of Things (IoT) owing to their advantage in room temperature operation. Nevertheless, due to a narrow light absorption range, high photocarrier recombination rate, and weak redox activity of the sensing material, the performance enhancement of the current light-activated gas sensors is still impeded. Herein, a full-spectrum solar light–activated gas sensor is designed based on W 18 O 49 /Ag 2 S nanocomposites with an S-scheme heterostructure for the highly sensitive detection of NO 2 at room temperature. Under solar light illumination, the gas sensor exhibits a high response of 430.84% to 1 ppm NO 2 , which is over 11 times higher than that based on pristine W 18 O 49 or Ag 2 S components. Moreover, the sensor demonstrates excellent repeatability fast response/recovery times (5/3 s), low limit of detection (50 ppb), high selectivity, and satisfactory long-term stability. The enhanced sensing performance might arise from the broadened light-harvesting capability and the unique charge carrier transfer mechanism in the S-scheme heterostructure. A Bluetooth-enabled portable monitoring system is further developed to achieve real-time NO 2 monitoring and wireless visualization. This work provides theoretical insights and experimental validation for the effectiveness of S-scheme heterostructure in enhancing room-temperature gas-sensing performance, demonstrating the prospective application potential for IoT-related environmental monitoring. 摘要 en This link goes to a English section zh This link goes to a Chinese section 光激活气体传感器因其室温工作的优势 , 在环境监测和智能物联网 领域具有重要潜力。然而 , 由于传感材料的光吸收范围窄、光生载流子复合速率高以及氧化还原活性较弱 , 目前光激活气体传感器的性能提升仍受到阻碍。本研究设计了一种基于W 18 O 49 /Ag 2 S纳米复合材料的全光谱太阳光激活气体传感器 , 该材料具有S型异质结构 , 可在室温下高灵敏检测NO 2 。在太阳光照射下 , 该气体传感器对1 ppm NO 2 的响应高达430.84% , 是纯W 18 O 49 或Ag 2 S组分的11倍以上。此外 , 该传感器展现出优异的可重复性、快速的响应/恢复时间 ( 5/3 s ) 、低检测限 ( 50 ppb ) 、高选择性以及令人满意的长期稳定性。 理论分析表明传感性能的增益源于S型异质结构中拓宽的光捕获能力和独特的载流子传输机制。在此基础上, 进一步开发了一套蓝牙便携式监测系统 , 实现了NO 2 的实时监测和无线可视化。本研究为S型异质结构有效增强气体传感性能提供了理论指导 和实验验证 , 为发展面向物联网应用的高灵敏室温气体传感器提供了重要技术支撑。
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BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Pengfei Yu,Jiaqi Cui,Jun Yang,Mati Ullah Khan,Lina Yang,Shanshan Li,Meixin Li,Shuang Liu,Ling Kong,Zhiwei Chen
Zearalenone (ZEN), a secondary metabolite mycotoxin primarily synthesized by Fusarium species and prevalent in cereal grains, exerts estrogenic effects that could induce reproductive toxicity and teratogenic outcomes. To enhance the precision of ZEN detection, we have developed an innovative photoelectrochemical (PEC) aptamer-based sensor employing in situ growth silver sulfide (Ag 2 S) quantum dots-sensitized graphitic carbon nitride/bismuth oxybromide (g-C 3 N 4 /BiOBr) heterojunction. The g-C 3 N 4 /BiOBr composite exhibits robust structural stability and straightforward synthesis. In situ growth Ag 2 S quantum dots could significantly amplify the signal, thereby elevating the sensor’s sensitivity. The sensor utilizes ZEN-specific aptamers for target-specific binding, ensuring high selectivity. Within the concentration range of 0.001 to 100 ng·mL −1 , the photocurrent response demonstrated a significant linear correlation with the logarithmic scale of ZEN concentration, with a detection limit reaching 0.122 pg·mL −1 . This PEC aptamer sensor exhibits excellent stability, reproducibility, and selectivity, which is expected to be used as an effective analytical tool for ZEN detection in practical applications.
研究领域:
食品安全
·
分析化学
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huiqin Chang,Meng Jiang,Qiying Zhu,Anqi Liu,Yuyin Wu,Canguo Li,Xiangyue Ji,Li Gong,Shanshan Li,Zhiwei Chen,Ling Kong,Lei Han
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-COV-2) is a cluster of β coronaviruses. The 2019 coronavirus disease (COVID-19) caused by SARS-COV-2 is emerging as a global pandemic. Thus, early diagnosis of SARS-COV-2 is essential to prevent severe outbreaks of the disease. In this experiment, a novel label-free photoelectrochemical (PEC) immunosensor was obtained based on silver sulfide (Ag 2 S) sensitized titanium dioxide@bismuth tungstate (TiO 2 @Bi 2 WO 6 ) nanocomposite for quantitative detection of SARS-COV-2 nucleocapsid protein. The constructed TiO 2 @Bi 2 WO 6 hollow microspheres had large specific surface area and could produce high photocurrent intensity under visible light illumination. Ag 2 S was in-situ grown on the surface of thioglycolic acid (TGA) modified TiO 2 @Bi 2 WO 6 . In particular, TiO 2 @Bi 2 WO 6 and Ag 2 S formed a good energy level match, which could effectively enhance the photocurrent conversion efficiency and strength the photocurrent response. Ascorbic acid (AA) acted as an effective electron donor to effectively eliminate photogenerated holes. Under optimal experimental conditions, the constructed immunosensor presented a supersensitive response to SARS-COV-2 nucleocapsid protein, with a desirable linear relationship ranged from 0.001 to 50 ng/mL for nucleocapsid protein and a lower detection limit of 0.38 pg/mL. The fabricated sensor exhibited a wide linear range, excellent selectivity, specificity and stability, which provided a valuable referential idea for the detection of SARS-COV-2.
研究领域:
生物医学工程
·
分析化学
·
病毒学
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高影响因子
危险品化学品经营许可证（带存储）