JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Mengdan Guan,Jin Wang,Kaili Wang,Junjie Wang,Rajkumar Devasenathipathy,Shunhao He,Liuyingzi Yu,Linrong Zhang,Haijiao Xie,Zhuoyao Li,Gang Lu
Photocatalytic evolution of hydrogen is becoming a research hotspot because it can help to produce clean energy and reduce environmental pollution. Titanium dioxide (TiO 2 ) and its composites are photocatalysts that are widely used in hydrogen evolution because of their high abundance in nature, low price, and high photo/chemical stability. However, their catalytic performances still need to be further improved, particularly in the visible light spectrum. Herein, visible light-driven photocatalytic evolution of hydrogen on Au/TiO 2 nanocomposite is enhanced ∼ 10 folds by selectively functionalizing the nanocomposite with cysteamine molecules. It is revealed that the amine group (–NH 2 ) in cysteamine favors the transfer and separation of photo-generated hot carriers. The rate of hydrogen produced can be further tuned by varying the ionization of the functionalized molecules at different pH values. This work provides a simple, convenient, and effective method that can be used to improve the photocatalytic evolution of hydrogen. This method can also be used for many other nanocatalysts (e.g., Au-MoS 2 , Au-BiVO 4 ) and catalytic reactions (e.g., carbon dioxide reduction, nitrogen reduction).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Plasmonics
·
2022
·Vol. 18
·期 1
·283-289
·
IF 2.726
Zhao Zhi-Rui,Zhang Shuo,Jing Rui-Ping,Kang Hao-Sen,Ding Si-Jing,Ma Liang
For noble metal core–shell nanomaterials with gaps, inserting Raman reporter molecules into the gaps allows for great Raman enhancement and has found promising applications in molecular analysis, bioimaging, and other fields. Herein, we synthesized Au/AgAu core–shell nanostructures with rhodamine B molecules encapsulated in the nanogap. Au/AgAu heterostructures have magnetic plasmon resonance by selecting gold nanocups as the substrate and tunable gap width by adjusting the molar ratio between Au and Ag during growing the shell. The strong and adjustable plasmon coupling between the core and the shell results in prominent electromagnetic field enhancement. Under the synergistic effect of electromagnetic plasmon resonance and plasmon coupling, the Au/AgAu heterostructures show excellent surface Raman scattering signal. Au/AgAu core–shell nanostructures with ~ 3.2 nm nanogap width display the highest Raman intensity. As the gap width is further reduced, the Raman signal gradually decreases, which may be due to the fact that the thicker alloy shell weakens the light penetration and scattering. Our findings can provide the inspiration for synthesize gap-enhanced Raman tags based on magnetic plasmon coupling.
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 2
·73
·
IF 4.2
Ying Song,Kunyue Xiao,Qiang Chen,Xiaodong Zhang,Zhi Yu,Wenwen Chen,Xiubing Zhang,De Zhang,Dejiang Ni,Pei Liang
The detection of bifenthrin is closely related to the adsorption of SERS substrates. In this study, superparamagnetic Fe3O4@Au MNPs coated with GO were used to detect the adsorption and enrichment of bifenthrin molecules with benzene rings. Firstly, the thermal solvent method synthesized Fe3O4magnetic nanoparticles (MNPs) with a particle size of ~250 nm. Next, polyethylene imide (PEI) was used as an intermediate layer to modify the surface of Fe3O4to form a positively charged ultra-thin polymer middle layer. Next, the gold shell was developed by adsorption of ~20 nm AuNPs, without affecting the magnetic properties. Then, the additional amount of colloidal gold and GO on SERS performance was systematically studied. Using crystal violet (CV) as the probe, we investigated the SERS performance of composite nanomaterials. The lowest detected concentration reached 10−8mol/L, confirming that the composite functional material had good SERS activity and magnetic properties. Finally, the substrate was used to detect bifenthrin in an acetone solution, and the lowest detection concentration was 10−8mol/L. These results showed that the prepared GO/Fe3O4@Au MNPs were efficient SERS substrates that could detect bifenthrin pesticide residue with high sensitivity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Chaopeng Liu,Zhongxian Song,Chaohai Wang,Ping Lan,Yilong Yang,Xu Yan,Haiyan Kang,Mengxia Ma,Deming Gu,Yuzhong Liu,Xiaole Yan,Yanli Mao
The disposal of gold-containing wastewater not only causes a waste of resources but also triggers major health issues. Herein, Cu 2 O functionalized ZIF-8 (CZF8-MW) was successfully synthesized by microwave-assisted method to adsorb gold (Au) ions in the water environment. The performance and mechanism of Au(III) adsorbed on CZF8-MW were systematically studied. The results reveal that CZF8-MW exhibits excellent adsorption capacity and a stronger affinity for Au(III) compared with pure Cu 2 O. The boosted adsorption mechanism of Au(III) can be ascribed to the electrostatic attraction between CZF8-MW and Au(III) in acidic conditions (pH = 3.0) and the reduction of Au(III) to Au(I) and Au(0) by Cu 2 O, prompting that the adsorption capacity of CZF8-MW is 1300 mg g −1 at 318 K. Besides, CZF8-MW holds superior selectivity for Au(III) in the presence of competing ions and shows outstanding reusability after five cycles. These results indicate that CZF8-MW possesses a great potential application for the adsorption of Au(III) from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Guiming Xie,Rongrong Jin,Pengju Ren,Yunming Fang,Runduo Zhang,Zhou-jun Wang
Boosted CO 2 hydrogenation to methanol was achieved by introducing appropriate amount of Au into conventional Cu-based catalysts. The Au x Cu/ZnO bimetallic catalysts with various Au/Cu molar ratio (x = 0.001, 0.005, 0.02 and 0.05) were prepared by the co-precipitation method, among which the Au 0.005 Cu/ZnO catalyst exhibited the highest methanol production rate. The formation of Au-Cu alloy was identified on the Au x Cu/ZnO bimetallic catalysts. Experimental characterizations and density functional theory (DFT) calculations suggested metal-oxide interfaces with oxygen vacancies as intrinsic active sties for both un-promoted and Au-promoted Cu/ZnO catalysts. The promotion effect of Au in bimetallic catalysts was correlated with the increase of active sites, facilitation of CO 2 activation and modification of intermediate adsorption. The present work for the first time develops a promising Au 0.005 Cu/ZnO bimetallic catalyst with trace amount of Au (only 0.4 wt%) and provides insight into the reaction mechanism over Au-promoted Cu/ZnO catalysts for methanol synthesis via CO 2 hydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 9
·1365-1373
·
IF 3.1
Xin Wu,Xingzhong Zhu,Caixia Kan,Daning Shi
Boosting the electrocatalytic performance of non-Pt catalysts for the hydrogen evolution reaction (HER) is of great importance in the context of the high price and scarcity of Pt. In this work, we successfully synthesized bimetallic core–shell nanostructures with Au nanostars as cores and Rh clusters as shells (Au@Rh nanostars) based on a two-step wet-chemistry strategy. We have demonstrated that the interaction strength between Rh and intermediate(s) involved in the HER could be effectively manipulated due to the existence of a strong electronic effect in bimetallic Au@Rh nanostars. The results from FDTD simulation suggested that the E-M field enhancement of the Au@Rh nanostar is inferior to that of the Au nanostar but there is a more localized distribution between the Au core and Rh shell. Benefiting from the synergistic effect and the plasmon-induced accelerated molecular transformations, the Au@Rh nanostars manifest outstanding plasmon-enhanced electrochemical activity toward the HER with a low overpotential of 28.5 mV for achieving the current density of 10 mA cm−2, which surpasses the commercial Pt/C. Furthermore, the obtained Au@Rh nanostars exhibited remarkable stability during the durability test with only a 3 mV shift in HER polarization curves after 5000 potential cycles. This study provides a versatile strategy for designing bimetallic core–shell nanostructures with plasmon-enhanced electrocatalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2023
·
IF 3
Xiaorong Lin,Liuxia You,Qingliu He,Wei Zhuang,Bizhen Huang,Dongxu Zheng
Taking advantage of the high-efficiency photocurrent response of bismuth oxychloride sensitized with gold nanoparticles (BiOCl−Au) in combination with the antigen-antibody biological recognition reaction, a convenient photoelectrochemical (PEC) immunoassay (model target: prostate-specific antigen; PSA) has been fabricated. In particular, the enhanced photocurrent response could be attributed to the enhanced optical absorption of visible light from surface plasmon resonance (SPR) effect of gold nanoparticles in the hierarchical structure of BiOCl layered. To realize the biological detection process, an immunoreaction was implemented between target PSA and alkaline phosphatase (ALP)-labeled anti-PSA antibodies. With the formation of ternary sandwich immunocomplex, the carried and loaded ALP catalysed the substrate ascorbic acid 2-phosphate (AAP) to generate ascorbic acid for increasing the photocurrent intensity of BiOCl−Au/FTO. Under optimum reaction time, the photocurrent peak intensity of BiOCl−Au/FTO increased with the increasing of target PSA concentration in the range of 0.01 ng/mL to 50 ng/mL with a limit of detection (LOD) down to 2.3 pg/mL. In the photocurrent control experiment, the photocurrent of BiOCl−Au/FTO was not only higher than that of BiOCl/FTO, but also showed greater changes in photocurrent under the same target PSA concentration. Impressively, the proposed split-type PEC immunoassay was applied to detect PSA concentration in human serum samples, giving acceptable and satisfactory accuracy compared with the gold standard PSA ELISA method.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jiaojiao Zhou,Weijia Zhu,Xuqin Lv,Xiaoping Du,Jiangling He,Jie Cai
Mercury ion (Hg2+) is toxic and can severely damage the environment and human health. Therefore, sensitive and selective Hg2+ detection methods are needed. Here, we synthesized dendritic silica nanospheres (DSN) with central-radial porous structures and immobilized Au and Pt nanoparticles into their pores. The synthesized DSN with Au and Pt nanoparticles (AuPt@DSN) exhibited superior peroxidase-like activity, stability, and dispersibility. We found that AuPt@DSN can specifically reduce Hg2+, leading to the decreased catalytic activity of the nanozymes. Under optimal testing conditions, the AuPt@DSN material was efficiently used for the visual detection of Hg2+. The detection limit was 8.58 pM with a linear range from 0.1 nM to 10 μM. Selectivity toward Hg2+ has also been demonstrated in aqueous solutions in the presence of other metal ions. This strategy is simple to utilize and has a low cost and rapid response. The practicability was further investigated by analyzing complex water samples, which suggests its potential for mercury evaluation in environmental samples.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5964-5974
·
IF 2.1
Zhou Xuebin,Ying Zhihua,He Xingxin,Zhang Chenhan,Zheng Xiaolong,Zheng Peng
Cellulose nanofiber (CNF), a natural polymer material with a high specific surface area, is a potential candidate for gas sensors. Here, we report Au/SnO 2 composites with excellent performance synthesized by a chemical precipitation method based on CNF-assisted synthesis, and a series of Au/SnO 2 composites were prepared by adjusting the Au content. The sensitivity of the 1.5 wt.% Au/SnO 2 sensor to a low concentration of 1 ppm NO 2 was 53, nearly 17 times higher than that of pure SnO 2 synthesized by CNF, under ultraviolet (UV) irradiation at a wavelength of 365 nm. The crystal structure of the composite was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), revealing that the composites had high crystallinity and particles reaching the nanoscale. Further experimental data showed that the CNF-assisted synthesis Au/SnO 2 sensors had good selectivity, repeatability, and stability. Additionally, the sensor is able to maintain its excellent gas sensing performance even under varying humidity conditions.
✓ 已验证
产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 16
·26474-26495
·
IF 3.8
Linlin Xu,Ming Chen,Qingqiang Cui,Chang Wang,Mnegya Zhang,Linqi Zheng,Shuang Li,Hua Zhang,Guangda Liang
Exploring multifunctional surface-enhanced Raman scattering (SERS) substrates with high sensitivity, broadband response property and reliable practicability should be required for ultrasensitive molecular detection in complex environments, which is heavily dependent on the photo-induced charge transfer (PICT) efficiency realized on the desirable nano-architectures. Herein, we introduce ultra-clean ternary Au/Ag/AgCl nanoclusters (NCs) with broadband resonance crossing the visible light to near-infrared region created by one step laser irradiation of mixed metal ion solution. Interestingly, the surface defects and interaction among these unique cluster-like ternary nanostructures would be further enhanced by thermal annealing treatment at 300°C, providing higher broadband SERS activities than the reference ternary nanoparticles under 457, 532, 633, 785, and 1064 nm wavelengths excitation. More importantly, the further promoted SERS activities of the resultant Au/Ag/AgCl NCs with achievable ∼5-fold enhancement than the initial one can be conventionally realized by simplistically declining the temperature from normal 20°C to cryogenic condition at about -196°C, due to the lower temperature-suppressed non-radiative recombination of lattice thermal phonons and photogenerated electrons. The cryogenic temperature-boosted SERS of the resultant Au/Ag/AgCl NCs enables the limit of detection (LOD) of folic acid (FA) biomolecules to be achieved as low as 10−12 M, which is obviously better than that of 10−9 M at room temperature condition. Overall, the smart Au/Ag/AgCl NCs-based broadband SERS sensor provides a new avenue for ultrasensitive biomolecular monitoring at cryogenic condition.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 16
·2370
·
IF 5.3
Ke Huang,Junfeng Lu,Donglin Li,Xianjia Chen,Dingfeng Jin,Hongxiao Jin
To improve the gas sensitivity of reduced oxide graphene (rGO)-based NO2room-temperature sensors, different contents (0–3 wt%) of rGO, ZnO rods, and noble metal nanoparticles (Au or Ag NPs) were synthesized to construct ternary hybrids that combine the advantages of each component. The prepared ZnO rods had a diameter of around 200 nm and a length of about 2 μm. Au or Ag NPs with diameters of 20–30 nm were loaded on the ZnO-rod/rGO hybrid. It was found that rGO simply connects the monodispersed ZnO rods and does not change the morphology of ZnO rods. In addition, the rod-like ZnO prevents rGO stacking and makes nanocomposite-based ZnO/rGO achieve a porous structure, which facilitates the diffusion of gas molecules. The sensors’ gas-sensing properties for NO2were evaluated. The results reveal that Ag@ZnO rods-2% rGO and Au@ZnO rods-2% rGO perform better in low concentrations of NO2gas, with greater response and shorter recovery time at the ambient temperature. The response and recovery times with 15 ppm NO2were 132 s, 139 s and 108 s, 120 s, and the sensitivity values were 2.26 and 2.87, respectively. The synergistic impact of ZnO and Au (Ag) doping was proposed to explain the improved gas sensing. The p-n junction formed on the ZnO and rGO interface and the catalytic effects of Au (Ag) NPs are the main reasons for the enhanced sensitivity of Au (Ag)@ZnO rods-2% rGO.Keywords:Au nanoparticles;Ag nanoparticles;rGO;ZnO rods;p-n junction;synergistic effect
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 49
·2304084
·
IF 13.3
Xiaolei Wang,Wenqian Wang,Bowen Liu,Zichen Song,Zhiyu Ren,Honggang Fu
Although the electron-withdrawing effect of gold (Au) is highlighted in catalytic reactions, its enhancement mechanism for electron transport, especially in the electrochemical process, is still unclear. Herein, Au-decorated Bi 2 O 3 (Au-Bi 2 O 3 ) is proposed as a proof-of-concept to investigate the electron-withdrawing effect in the electrocatalytic CO 2 reduction reaction (eCO 2 RR) process. Evidence from in situ Raman spectra and in situ XRD tests reveals that, compared to Bi 2 O 3 , Bi species in Au-Bi 2 O 3 can be reduced to metallic Bi more rapidly and more easily driven by the electron-withdrawing effect of Au. The XPS tests after eCO 2 RR further validates the transformation from Bi 3+ to Bi 0 in Au-Bi 2 O 3 is more complete. Meanwhile, in the in situ Fourier transform infrared (FTIR) spectra, the key intermediates (CO 2 * − and OCHO* − ) appear at the more positive potential, indicating that metallic Bi is favorable for eCO 2 RR due to the lower energy barrier as corroborated by density function theory (DFT) calculations. Au don't directly participate in the conversion from CO 2 to formate as the reaction sites, but utilize the electron-withdrawing effect to motivate Bi-sites to deliver higher catalytic activity and higher selectivity to formate at a lower applied potential. This study not only has an insight into the electron-withdrawing effect of Au on the eCO 2 RR process, but also develops a new perspective for engineering electron-withdrawing effect in electrocatalysts for high-efficient CO 2 -to-formate conversion.
✓ 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）