APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Li Sun,Zhili Qiao,Yuan Zhi,Hua Zhang,Binlin Dou,Yuejin Shan,Weijia Huang
Bulk noble metal–semiconductor composites can be chosen as photocatalysts to carry out the flow degradation of 4-nitrophenol (4-NP) whereas their preparation is complex and uncontrollable. Here, bulk Au-Co-CoO x -CeO x @iron ball (Au/Co-CC@iron ball) is designed and prepared by a facile and controllable route without any toxic chemical. The bulk Au/Co-CC@iron ball shows excellent photocatalytic activity and reusability for the 4-NP degradation, which can be ascribed to the synergistic action of active components and foliated iron ball surface. Furthermore, the highly active Au/Co-CC@iron ball is used as packing material to construct a new-type of packed reactor, by which the flow degradation of 4-NP is successfully achieved. As-fabricated packed reactor and its tandem module exhibit superior photocatalytic performance for the flow degradation of 4-NP. Noteworthy, based on the tandem module with six reactors, the removal rate of 4-NP can reach up to 2750 µmol/h. Meanwhile, the reactor and its module display satisfactory operational stability and reusability in the flow degradation of 4-NP. Clearly, the provided route is effective for the preparation of bulk noble metal–semiconductor composites with exceptional performance, which can also be a prospective strategy to obtain bulk packing materials to serve for the flow degradation.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Chen Sun,Yutong Ye,Xueting Luo,Wentao Xiang,Cao Li,Bingbing Jiang,Xiaoying Wang,Ziqiang Xu
Total antioxidant capacity (TAC) is a significant indicator for evaluating nutritional value of fruit and beverage industries, in the aspects of their reactive oxygen species (ROS) scavenging activity. The sensitivity and selectivity of the TAC assay based on the peroxidase (POD) assay is restricted by their poor catalytic activity. Herein, a simple and sensitive strategy for assessing TAC in fruits based on light (808 nm) boosted POD like activity of Au 25 nanoclusters (NCs) have been reported. The absorption bands of mercaptohexanoic acid (MHA)-protected Au 25 NCs could be extended into the near-infrared region (∼770 nm) by introducing neutrally charged ligands or 2,2’(ethylene dioxy) diethyl thiol (EDT)) as bi-thiol ligands, which may contribute to more obvious light enhanced POD activity. The most intense absorption at 770 nm can be obtained by the ratio of MHA/EDT=1.7:0.3 (denoted as MEA-17). Since we have confirmed that ROS is involved in the light enhanced POD like activity, the concentration of various antioxidants AA, GSH and L-Cys, can be analyzed by their inhibitory effect to the oxidation of TMB. More importantly, light enhanced POD like activity of MEA-17 have been successfully utilized to analysis TAC value in various fresh fruits. This work not only provide novel direction for the rational development of near-infrared light-enhanced POD-like nanozyme, but also further expands the prospect of the application of Au 25 NCs protected with thiols for TAC analysis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Juan Li,Zelin Ma,Ke Yang,Fei Zhao,Haoyuan Yang,Hongqiang Wang,Yibo He
Anode-free lithium metal batteries (AFLMBs) are considered to have greater application potential than traditional LMBs because of their higher energy density and safety. Unfortunately, their poor cycling performances originated from the unsatisfactory reversibility of Li plating/stripping remains a big challenge. A rational designed host for lithium deposition is an effective solving strategy. Herein, pure Au nanoparticles (NPs) without any impurities are prepared by a liquid-phase laser irradiation technology to construct and develop a self-supported Au/reduced graphene oxide (Au/rGO) film as lithium deposition host for AFLMBs. The densely and uniformly distributed Au NPs provide abundant lithiophilic sites that significantly reduce the nucleation barrier of lithium. Attributed to the precise regulation of Au sites towards lithium nucleation/growth, dendrites-free anode and improved electrochemical performance are obtained by using the Au/rGO film host. It keeps stable for 30 min of lithiation at 6 mA cm −2 without dendrite formation. Additionally, the Li||Au/rGO half-cell shows an overpotential close to 0 mV and maintains a Coulombic efficiency exceeding 97 % after 500 cycles at 1 mA cm −2 . Moreover, a symmetric Au/rGO-Li cell can operate for 700 h without short-circuit. When paired with LiFePO 4 (LFP) to assemble a full battery, the Au/rGO-Li achieves 96 % capacity retention rate after 100 cycles. This work not only develops an efficient host for lithium, but also provides a unique strategy to the safety concerns associated with LMBs’ anodes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-12
·
IF 5.3
Wu Wei,Han En,Ma Lixin,Zhou Ruiyun,Wang Chen,Bai Junwen,Cai Jianrong
A label-free surface-enhanced Raman scattering (SERS) sensor using optimal bimetallic Au@Ag nanocuboids (Au@Ag NCs) was developed for ultrasensitive detection of florfenicol residue in eggs. The Raman characteristic peaks of florfenicol detection were identified at 1145 cm −1 and 1595 cm −1 which were consistent with the theoretical Raman spectrum of florfenicol calculated by density functional theory. The Au@Ag NCs were optimized by changing the aspect ratio of Au nanorods and the thickness of Ag nanocuboids, achieving an enhancement factor of 1.69 × 10 6 for SERS signals. Under optimal conditions, the label-free SERS sensor demonstrated a broad linear range of 0.01 mg/kg to 100 mg/kg for florfenicol in real sample. The limit of detection of florfenicol in eggs was as low as 0.0410 μg/kg, and the recovery was 94.83% ~ 108.24%. Therefore, this label-free SERS sensor offers a rapid and sensitive approach for the trace detection of florfenicol residues in food safety monitoring. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-9
·
IF 5.3
Xiang Jiawang,Zhang Bing,Yuan Yuan,Zhao Zhihuan,Lin Jianying,Li Jing
A novel signal amplification strategy was developed by combining near-infrared light with MoS 2 /CuO/Au nanocomposite for building a colorimetric immunoassay. First, MoS 2 /CuO/Au nanocomposite was synthesized by precipitation and photoreduction methods and characterized by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). MoS 2 /CuO/Au nanocomposite has oxidase-like activity and can oxidize TMB to form a blue product (TMBox). Further, the catalytic oxidation of TMB was accelerated under near-infrared (NIR) laser radiation. The sandwich-type colorimetric immunoassay was constructed using MoS 2 /CuO/Au nanocomposite. Under the enhancement of near-infrared light, carcinoembryonic antigen (CEA) was sensitively detected in the range 0.1 to 40 ng/mL with the limit of detection of 0.03 ng/mL. Moreover, the immunosensor has excellent selectivity and anti-interference, good repeatability, and stability. Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2024
·
IF 9.6
Zhang Wen-Jing,Jin Li-Guo,Wu Shui-Lin,Wang Chao-Feng,Zheng Yu-Feng,Li Zhao-Yang,Cui Zhen-Duo,Jiang Hui,Zhu Sheng-Li,Liu Xiang-Mei
Deep tissue infections caused by pathogenic bacteria seriously threat the lives of patients. In this study, a smart heterostructured Au/Cu–BTA (BTA = 1,2,4,5-benzenetetramine) with microwave (MW) response is synthesized via NaBH 4 reduction of HAuCl 4 on the Cu–BTA. Au/Cu–BTA exhibits excellent hyperthermy and dynamics under MW irradiation. The MW thermal mechanism of Au/Cu–BTA is attributed to the excellent dielectric loss and polarization of the heterogeneous interface. Meanwhile, the surface energy levels of the Cu–BTA interface alleviate the difficulty of electron hopping through multistage transition. Therefore, MW can excite Cu–BTA to produce free electrons. Subsequently, Au nanoparticles rapidly increase electron transfer and inhibit electron–hole recombination. Hence, the yields of reactive oxygen species can be enhanced for MW dynamic therapy. Consequently, under 10 min of MW irradiation, Au/Cu–BTA killed 99.998% ± 0.001% of Gram-positive Staphylococcus aureus , 99.966% ± 0.014% of methicillin-resistant Staphylococcus aureus , and 96.871% ± 0.831% of Gram-negative Pseudomonas aeruginosa . The effective MW bacteria-killing strategy designed in this study shows significant potential for application in the MW-responsive treatment of deep tissue infections without antibiotics. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhihua Zhao,Zijie Su,Chunhua Zheng,Guixin Jin,Lan Wu
Given the considerable harm that NO 2 poses to the environment and human health, developing reliable NO 2 detection sensors is crucial. Herein, a flexible, multifunctional sensor was successfully synthesized through hydrothermal and the wet impregnation methods using an elastic PU yarn as the substrate. This sensor, named Au/VTe 2 /Ti 3 C 2 T x –PU, was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy to analyze its structure, chemical valence states, and micromorphology. At room temperature (23 °C), the sensor demonstrated an exceptionally high response to NO 2 gas, with a response value of 1.72 at 50 ppm as well as low response and recovery time of 33 and 38 s. Additionally, testing of the strain performance of Au/VTe 2 /Ti 3 C 2 T x –PU showed that this flexible sensor exhibits high strain sensitivity, excellent repeatability, and durability, making it suitable for detecting subtle human movements. Overall, the synthesized sensor is in considerable advantages in terms of both gas-sensing performance and tensile performance, exhibiting broad application prospects in human motion and health monitoring.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yan Su,Pengfei Gao,Guomei Zhang,Ying Zhou,Lihong Shi,Jianlin Wu,Wenting Liang,Shaomin Shuang,Yan Zhang
In this study, the N-Acetyl- l -Cysteine (NAC)-capped gold and silver bimetallic nanoclusters (NAC@Au–Ag NCs) was synthesized by reflux method. Due to the silver effect, the NAC@Au–Ag NCs exhibited strong photoluminescence at far-red/near-infrared regions and better catalytic performance than Au or Ag NCs. Upon addition of H 2 S, the Au–Ag NCs exhibited obvious fluorescence quench and color changes through the generation of metal sulfides and a static quenching process. The Au–Ag NCs displayed a wide linear luminescence response for H 2 S (18.5–217 μmol/L) with a detection limit of 0.269 μmol/L. Moreover, the visible color of Au–Ag NCs changed from white to brown-yellow along with increased H 2 S, the corresponding RGB values also displayed good linearity with the concentration of H 2 S (90.1–678 μmol/L). Notably, the fabrication of test strips provided a convenient and intuitive tool to screen the freshness of eggs by the color change of test strips. Au–Ag NCs could be used for living HeLa cells bioimaging and recognition of H 2 S abnormalities. Furthermore, it can be used as a catalyst to reduction of nitrophenols (NPhs), specific included 2NP, 3NP and 4NP. The reaction was regarded as a pseudo-first-order kinetic reaction due to the presence of excess NaBH 4 . At 298K, the catalytic rate constants(k) of 2NP, 3NP and 4NP were 0.1754 min −1 , 0.1734 min −1 and 0.2782 min −1 , respectively. The NAC@Au–Ag NCs catalyst still showed good catalytic activity and reusability after five cycles. Therefore, this study developed a H 2 S sensor for food samples and biological systems. And this nanocatalyst had great application potential for removed the nitrophenol pollutants in water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2024
·
IF 5
Xueyang Ren,Jie Zheng,Jinxian Zhao,Jun Ren,Yanhong Quan
The one-step oxidative esterification of ethylene glycol (EG) is an effective and promising route for methyl glycolate (MG) synthesis, during which the development of efficient catalysts is critically crucial. Herein, Au/ZnO catalysts were prepared using impregnation (IM), colloidal-deposition (CD), deposition-precipitation (DP) and co-precipitation (CP) methods, respectively. The catalytic activities results revealed that the Au/ZnO-DP catalyst was far superior than the other three catalysts, achieving an EG conversion rate of 90.4% and a selectivity towards MG of 93.8%. Catalysts were systematically characterized by N2 adsorption-desorption, XRD, TEM, XPS, H2-TPR, EPR, O2-TPD and CO2-TPD. The results showed that the large number of Au-ZnO interfaces facilitated the adsorption and activation of O2. Moreover, it is found that the basic sites promoted the cleavage of O-H bonds in the EG molecules, and the acidic sites are responsible for the selectivity of MG. This work offers a simple strategy for design of gold catalysts in EG oxidative esterification.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Hongchao Zhao,Jing Li,Xiaopeng She,Yi Chen,Mengqing Wang,Yanjie Wang,Aijun Du,Cheng Tang,Cheng Zou,Yong Zhou
Sensitive and selective acetone detection is of great significance in the fields of environmental protection, industrial production, and individual health monitoring from exhaled breath. To achieve this goal, bimetallic Au@Pt core–shell nanospheres (BNSs) functionalized-electrospun ZnFe2O4 nanofibers (ZFO NFs) are prepared in this work. Compared to pure NFs-650 analogue, the ZFO NFs/BNSs-2 sensor exhibits a stronger mean response (3.32 vs 1.84), quicker response/recovery speeds (33 s/28 s vs 54 s/42 s), and lower operating temperature (188 vs 273 °C) toward 0.5 ppm acetone. Note that an experimental detection limit of 30 ppb is achieved, which ranks among the best cases reported thus far. Besides the demonstrated excellent repeatability, humidity-enhanced response, and long-term stability, the selectivity toward acetone is remarkably improved after BNSs functionalization. Through material characterizations and DFT calculations, all these improvements could be attributed to the boosted oxygen vacancies and abundant Schottky junctions between ZFO NFs and BNSs, and the synergistic catalytic effect of BNSs. This work offers an alternative strategy to realize selective subppm acetone under high-humidity conditions catering for the future requirements of noninvasive breath diabetes diagnosis in the field of individual healthcare.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Jianfeng Chen,Ran Hou,Sen Li,Chuanxi Sun,Kai Peng,Yichuan Dai,Xiaoxiao Chen
As the quintessential material for flexible sensors, conductive hydrogels face an inherent sensitivity-sensing range paradox and electrical-mechanical balance, which significantly curtail its applicability in multiscale motion detection. Inspired by the spider slit sensor, PAM/CNTs-Au hydrogel microcrack sensor is obtained by depositing conductive gold film on the surface of PAM/CNTs hydrogel using magnetron sputtering. By modulating the cross-linking density of conductive hydrogels and the content of carbon nanotubes (CNTs), it is possible to tailor the mechanical properties and adhesion of PAM/CNTs-Au hydrogel crack-based sensors. This self-adhering flexible sensor aids in minimizing detection errors arising from mechanical mismatch between flexible sensors and human tissues. Moreover, the exceptional electrical conductivity of CNTs, coupled with their unique one-dimensional structure, facilitates the formation of an interconnected conductive network "bridge" within the hydrogel. The harmonization of electrical and mechanical attributes in the PAM/CNTs flexible substrate is achieved by finely tuning the crosslinking density of the PAM hydrogel and the content of carbon CNTs. Simultaneously, the high-conductivity "islands" formed by the Au conductive layer during stretching ensures elevated sensitivity (gauge factor (GF) = 54.89) over an extensive detection range (>1200%). The distinctive "island-bridge" configuration of the PAM/CNTs-Au hydrogel microcrack sensor effectively suppresses crack propagation, thereby markedly augmenting the sensor's stability. Successful monitoring of physiological and motion signals across various scales attests to the potential of the PAM/CNTs-Au hydrogel microcrack sensor in wearable biosensor.
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Fang-Kai Du,Hui Zhang,Xue-Cai Tan,Jun Yan,Min Liu,Xiao Chen,Ye-Yu Wu,De-Fen Feng,Quan-You Chen,Jian-Mei Cen,Shao-Gang Liu,Yu-Qin Qiu,He-You Han
In this work, the feasibility of a novel sensitive electrochemiluminescence aptasensor for the detection of lysozyme using Ru(bpy) 3 2+ [email protected] L -lysine-Au ( [email protected] ) nanocomposites labeling as an indicator was demonstrated. The substrate electrode of the aptasensor was prepared by depositing gold nanoparticles (AuNPs) on 3D graphene-modified electrode. The lysozyme binding aptamer (LBA) was attached to the 3D graphene/AuNPs electrode through gold-thiol affinity, hybridized with a complementary single-strand DNA (CDNA) of the lysozyme aptamer labeled by [email protected] as an electrochemiluminescence intensity amplifier. Thanks to the synergistic amplification of the 3D graphene, the AuNPs and [email protected] NPs linked to Ru(bpy) 3 2+ -ECL further enhanced the ECL intensity of the aptasensor. In presence of lysozyme, the CDNA segment of the self-assembled duplex was displaced by the lysozyme, resulting in decreased electrochemiluminescence signal. Under the optimized conditions, the decrease in electrochemiluminescence intensity varied proportionally with the logarithmic concentration of the lysozyme from 2.25 × 10 –12 to 5.0 × 10 −8 mol L −1 , and the detection limit was estimated to 7.5 × 10 –13 mol L −1 . The aptasensor was further tested in real samples and found reliable for the detection of lysozyme, thus holding great potential application in food safety researches and bioassay analysis.
✓ 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）