JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 6
·3237-3249
·
IF 2.779
Wang Siyu,Guo Jiaxiong,Lin Zhidong,Liu Liming,Hui Yuchong,Zhang Xiaowen
A series of very small grain Au/SnO 2 composites were synthesized by a facile hydrothermal method. The microstructure of the Au/SnO 2 composites were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, and nitrogen adsorption–desorption experiment. The composites were composed of 20–30 nm spherical nanoparticles, which are hierarchical structure composed of 8 nm Au cores and 5 nm SnO 2 nanograins. The composites were porous material with large specific surface area. The sensors based on the Au/SnO 2 composites showed high sensitivities and selectivity to n -butanol at low working temperature with fast response. Among these sensors, the 1.5 wt% Au/SnO 2 -based sensor shows the highest response (2662.8) to 100 ppm n -butanol with the response time of 35 s at 80 °C. The excellent low-temperature gas-sensing properties of the Au/SnO 2 sensors can be ascribed to the synergetic effect of high surface energy of small SnO 2 nanograins and catalysis of gold nanoparticles. Our study demonstrates that controlling the grain size of SnO 2 and Au nanoparticle-assisted gas sensing are effective methods to improve the sensing properties of SnO 2 at low working temperature. The 1.5 wt% Au/SnO 2 composite is a potential low-temperature gas-sensing material for n -butanol detection.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10388-10398
·
IF 3.553
Zhong Mingjun,Zhang Shizhen,Dong Anwang,Sui Zhuyin,Feng Lijuan,Chen Qi
Heterogeneous metal–organic framework composites are widely used to catalyze the synthesis reaction of organic materials. Here, we report the use of a heterogeneous catalyst to catalyze the reaction of alcohols and amines to synthesize imines directly using a one-pot method. A low-dimensional Cu-MOF prepared by a simple surfactant-assisted method shows the morphology of nanorods. Cu-MOF nanorods provide an ideal support for preparing supported metal nanocatalysts. A reduction method was applied to immobilize the ultrafine noble metal Au and Pd nanoparticles on the surface of Cu-MOF nanorods to form a Cu-MOF/Au–Pd composite catalyst. Cu-MOF/Au–Pd catalyst is used to catalyze the reaction between alcohols and amines to form imines. Due to the synergy between different metal nanoparticles, it can effectively catalyze the reaction to form imines. In addition, Cu 2+ in Cu-MOF/Au–Pd catalyst facilitates the adsorption of substances by excess electrons and promotes product formation. After 12 h of catalytic reaction, the yield of imine is as high as 95%.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 19
·11197
·
IF 6.208
Xiaoxiao He,Xiaohong Ma,Yujun Yang,Xi Hu,Teng Wang,Shiyue Chen,Xiang Mao
In this work, we firstly report the preparation of heterogeneously assembled structures Au-Ag nanoclusters (NCs) as good drug carriers with high loading performance and biocompatible capability. As glutathione-protected Au and Ag clusters self-assembled into porous Au-Ag NCs, the size value is about 1.358 (±0.05) nm. The morphology characterization revealed that the diameter of Au-Ag NCs is approximately 120 nm, as well as the corresponding potential ability in loading performance of the metal cluster triggered-assembling process. Compared with individual components, the stability and loading performance of heterogeneous Au-Ag NCs were improved and exhibit that the relative biocompatibility was enhanced. The exact information about this is that cell viability was approximately to 98% when cells were incubated with 100 µg mL−1particle solution for 3 days. The drug release of Adriamycin from Au-Ag NCs was carried out in PBS at pH = 7.4 and 5.8, respectively. By simulating in vivo and tumor microenvironment, the release efficiency could reach over 65% at pH = 5.8 but less than 30% at pH = 7.2. Using an ultrasound field as external environment can accelerate the assembling process while metal clusters triggered assembling Au-Ag NCs. The size and morphology of the assembled Au-Ag NCs can be controlled by using different power parameters (8 W, 13 W, 18 W) under ambient atmosphere. Overall, a novel approach is exhibited, which conveys assembling work for metal clusters triggers into heterogeneous structures with porous characteristic. Its existing properties such as water-solubility, stability, low toxicity and capsulation can be considered as dependable agents in various biomedical applications and drug carriers in immunotherapies.Keywords:Au-Ag NCs;heterogeneous structures;assembling;drug carriers;biocompatibility
研究领域:
纳米医学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biosensors-Basel
·
2023
·Vol. 13
·期 8
·766
·
IF 5.4
Xiaoxiao Zhou,Shouhui Chen,Yi Pan,Yuanfeng Wang,Naifeng Xu,Yanwen Xue,Xinlin Wei,Ying Lu
In order to improve the detection performance of surface-enhanced Raman scattering (SERS), a low-cost Au@Ag nanorods (Au@Ag NRs) substrate with a good SERS enhancement effect was developed and applied to the detection of malachite green (MG) in aquaculture water and crayfish. By comparing the SERS signal enhancement effect of five kinds of Au@Ag NRs substrates with different silver layer thickness on 4-mercaptobenzoic acid (4-MBA) solution, it was found that the substrate prepared with 100 µL AgNO3had the smallest aspect ratio (3.27) and the thickest Ag layer (4.1 nm). However, it showed a good signal enhancement effect, and achieved a detection of 4-MBA as low as 1 × 10−11M, which was 8.7 times higher than that of the AuNRs substrate. In addition, the Au@Ag NRs substrate developed in this study was used for SRES detection of MG in crayfish; its detection limit was 1.58 × 10−9M. The developed Au@Ag NRs sensor had the advantages of stable SERS signal, uniform size and low cost, which provided a new tool for SERS signal enhancement and highly sensitive SERS detection method development.Keywords:Au@Ag nanorods substrate;surface-enhanced Raman scattering (SERS);malachite green
研究领域:
分析化学
·
食品安全检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu
In this study, corn bract was modified with thiosemicarbazide (TSC-CCB) and used to selectively adsorb Au(III) from aqueous solutions. FT-IR spectroscopy, Scanning electron microscope and X-ray photoelectron spectroscopy were used to characterize TSC-CCB and investigate the adsorption mechanism. The results suggested that the maximum adsorption amount of Au(III) was 1470.22 mg/g at 25 °C with pH of 6.0. The adsorption isotherm and kinetic data were matched adequately with Langmuir model and pseudo-second-order model, respectively. Meanwhile, TSC-CCB presented a good selectivity for Au(III) from the competitive ions. The ion exchange and chelation between Au(III) and S/N groups played an important role in the enhancement of the adsorption capacity. The regeneration experiments suggested that the TSC-CCB retained high adsorption efficiency after three cycles. TSC-CCB was a promising adsorbent for recovery Au(III) from wastewater in the view of sustainability.
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
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Shengqiang Zhou,Tianliang Lu,Lipeng Zhou,Xiaomei Yang
Au/Sn-zeolite catalysts showed high activity for selective conversion of glycerol to methyl lactate, but suffered from poor stability under the reaction conditions in our previous report (ACS Catal. 2017, 7, 7274). Encapsulation of Au nanoparticles within zeolite is a promising strategy to enhance their stability in catalytic reaction. Herein, one-pot synthesis of Au@Snβ was achieved by a mercaptosilane-assisted hydrothermal synthesis method. The protocol involves crystallization of Snβ synthesis gels around coordinated Au precursors, resulting in Snβ framework constraining Au coordination complexes. The confinement of small (∼2.89 nm) and uniform Au particles within Snβ was achieved. The bifunctional catalyst composed of oxidative sites (Au) and Lewis acid sites (Sn) gave 77.3 % methyl lactate (MLA) yield from the base-free selective conversion of glycerol (GLY). The TOF value of Au@Snβ was higher than that of Au/Sn-zeolite in our previous report. Moreover, the special structure protects Au nanoparticles from sintering or agglomeration and improves the stability and recyclability in selective oxidation of GLY to MLA.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jinyu Huang,Jianwei Li,Zhonglei Zhang,Junda Li,Xiangdong Cao,Jihua Tang,Xuejin Li,Youfu Geng,Jiaqi Wang,Yu Du,Yatao Yang,Xiaofang Pan
Detecting trace ppb-level of formaldehyde (HCHO) in indoor ambient and human exhaled breath using metal oxide semiconductor (MOS) gas sensor has attracted increasing attention. Herein, Ag nanoparticles (Ag NP) modified In 2 O 3 and Au nanocage (Au NC) modified In 2 O 3 as well as bimetal Ag NP and Au NC co-modified In 2 O 3 were successfully prepared via one-step microwave-assisted solvothermal method and were used to construct semiconductor gas sensor. It is exciting to observe that the sensor based on Ag 6 Au 1 /In 2 O 3 exhibits the highest response of 277 toward 5 ppm HCHO at low operating temperature (170 °C), which is about 7 times, 38 times and 102 times higher than 6 wt. % Ag/In 2 O 3 , 1 wt. % Au/In 2 O 3 and pristine In 2 O 3 , respectively. Moreover, the selectivity and detection limit (down to 26 ppb) of Ag 6 Au 1 /In 2 O 3 sensor to HCHO have been proven to be greatly improved. This excellent sensing performance indicates that the proposed bimetal Ag and Au co-modification with synergistic catalysis effect offers an effective design for highly sensitive and efficient HCHO detection devices. Moreover, the mechanism of HCHO sensing with Au and Ag co-loaded In 2 O 3 was explored by the calculations obtained from first-principle density functional theory studies .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 7
·769
·
IF 2.589
Yazhou Qin,Binjie Wang,Yuanzhao Wu,Jiye Wang,Xingsen Zong,Weixuan Yao
Bimetallic nanoparticles have received extensive attention due to their unique physical and chemical properties, including enhanced optical properties, chemical stability, and better catalytic activity. In this article, we have successfully achieved the controllable preparation of Ag@Au nanoparticles via a seed-mediated growth method. By regulating the amount of seeds—silver nanospheres—we realized that Ag@Au nanoparticles gradually changed from spherical to a sea-urchin-like structure. The structure and composition of the prepared nanoparticles were characterized via scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and high-angle circular dark field scanning transmission electron microscopy (HAADF-STEM). In addition, we use the prepared Ag@Au nanoparticles as a substrate material for highly sensitive surface-enhanced Raman spectroscopy (SERS). Using 4-aminothiophenol (4-ATP) as the test molecule, we explored the SERS enhancement effects of Ag@Au nanoparticles with different structures. Furthermore, we used Ag@Au nanoparticles for SERS to detect the drug fentanyl, and realized the label-free detection of fentanyl, with the lowest detection concentration reaching 10−7M. This research not only provides a method for preparing bimetallic Ag@Au nanoparticles with different structures, but also provides a reference for the application of Ag@Au nanoparticles in the field of detection technology.Keywords:Ag@Au nanoparticle;core–shell structure;sea-urchin-like structure;SERS;fentanyl
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 41
·19586-19594
·
IF 7.233
Jia Liu,Kai Chen,Gui-Ming Pan,Zhi-Jun Luo,Ying Xie,Ying-Ying Li,Yong-Jie Lin,Zhong-Hua Hao,Li Zhou,Si-Jing Ding,Qu-Quan Wang
In this study, we synthesized CdS/(Au–ReS2) nanospheres that have highly efficient photocatalytic hydrogen production activity induced by dielectric–plasmon hybrid antenna resonance. As the diameter (D) of ReS2 nanospheres consisting of 2D nanosheets increases from 114 ± 11 to 218 ± 25 nm, the resonance wavelength of the ReS2 dielectric antenna is tuned from 380 to 620 nm and the hydrogen production rate for the CdS/(Au–ReS2) nanospheres increases by more than 1.85 times and reaches a value as high as 3060 μmol g−1 h−1, with a 9% weight percentage of Au. Due to the enhancements of the local electromagnetic field and excitation energy transfer by the ReS2–Au dielectric–plasmon hybrid antenna, the hydrogen production rate for the CdS/(Au–ReS2) nanospheres (D = 218 ± 25 nm) is 797, 319, 105 and 12 times larger than that for pure ReS2, Au–ReS2, CdS, and CdS–ReS2, respectively. Additionally, the persistence and reusability measurements indicate a favorable stability of CdS/(Au–ReS2). These results provide a strategy to prepare a new class of dielectric–plasmon hybrid antennas consisting of 2D materials and metal nanoparticles, which have promise in applications ranging from photocatalysis to nonlinear optics.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Libo Sun,Qingtai Xie,Heshun Jing,Jindong Xie,Wenyu Tan,Baorong Duan,Xun Sun,Caixia Qi,Huijuan Su
The development of nanogold catalysts with high activity and high stability is of great significance for their industrial applications. In this paper, Au-PDA@Fe 3 O 4 catalysts were prepared through the gold sol adsorption method. First, micron-sized magnetic Fe 3 O 4 spheres were synthesized via a solvothermal method, serving as the core to endow the catalyst with excellent recyclability. Subsequently, a layer of polydopamine (PDA) shell was polymerized on the magnetic core surface. By controlling the timing of introducing the gold sol containing Au nanoparticles (NPs), the spatial position of Au NPs within the PDA layer was regulated, leading to a series of magnetic core-shell nano gold catalysts with varying spatial positions of Au. Using the 4-nitrophenol (4-NP) hydrogenation as the probe, the influence of Au spatial position, Au size, and other conditions on the catalytic performance was investigated. Results showed that, in the prepared Au-PDA@Fe 3 O 4 -16 catalyst, the Au NPs are encapsulated within the PDA shell and positioned close to the outer layer. This not only provides remarkable stability to the Au NPs but also maintains their proximity to the surface of the PDA shell, allowing easier access of the substrate 4-NP to the Au NPs and conferring good reactivity upon the catalyst. The strong electron metal-support interaction between PDA and Au enables PDA to effectively stabilize Au NPs. The prepared Au-PDA@Fe 3 O 4 -16 catalyst exhibits excellent stability, maintaining a high conversion rate of 91 % even after 14 cycles of use. Our findings not only deepen the understanding of the catalytic mechanisms involved but also pave the path towards the creation of highly efficient and robust gold-based catalysts, facilitating their widespread utilization in industrial applications.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Liuqing Li,Yaping Wang,Yu Ruan,Tiefeng Xu,Shaoyi Wu,Wangyang Lu
The photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is important to facilitate the conversion of biomass into high-value compounds under mild conditions. This study developed Au/TiO 2 catalysts through the urea deposition method, subsequently integrating them with iron phthalocyanine (FePc) via ball milling, resulting in FePc/Au-TiO 2 . These catalysts were calcined at various temperatures. The results indicated that Au nanoparticles are uniformly dispersed on TiO 2 , and Fe in FePc/Au TiO 2 calcined at 410 °C mainly exists in the form of ferrosoferric oxide (Fe 3 O 4 ). FePc/Au-TiO 2 with 30 % FePc which calcined at 410 °C demonstrated outstanding photocatalytic activity, achieving a 97 % yield of FDCA. The effects of various experimental parameters on the conversion of HMF to FDCA were investigated, such as the calcination temperatures, the FePc amount, base, and catalyst dosage. Electron paramagnetic resonance and active species capture tests revealed the catalyst can convert O 2 into •O 2 – and 1 O 2 through excited electrons and photogenerated holes. This study highlights the role of interfacial coupling interactions in boosting catalytic performance, offering a novel approach for photocatalyst development in converting HMF to FDCA.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 7
·2110
·
IF 3.4
Yinfeng Shen,Yiping Liu,Chao Fan,Qudong Wang,Ming Li,Zhi Yang,Liming Gao
The mature processes of metal oxide semiconductors (MOS) have attracted considerable interest. However, the low sensitivity of metal oxide semiconductor gas sensors is still challenging, and constrains its practical applications. Bimetallic nanoparticles are of interest owing to their excellent catalytic properties. This excellent feature of bimetallic nanoparticles can solve the problems existing in MOS gas sensors, such as the low response, high operating temperature and slow response time. To enhance acetone sensing performance, we successfully synthesized Au-Pd/ZnO nanorods. In this work, we discovered that Au-Pd nanoparticles modified on ZnO nanorods can remarkably enhance sensor response. The Au-Pd/ZnO gas sensor has long-term stability and an excellent response/recovery process. This excellent sensing performance is attributed to the synergistic catalytic effect of bimetallic AuPd nanoparticles. Moreover, the electronic and chemical sensitization of noble metals also makes a great contribution. This work presents a simple method for preparing Au-Pd/ZnO nanorods and provides a new solution for the detection of acetone based on metal oxide semiconductor.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 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）