NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 22
·13968-13973
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IF 3.269
Bing Zhang,Xuehua Yin,Deshuai Zhen,Wenhong Gu,Yingju Liu,Qingyun Cai
A metal–semiconductor heterojunction material was synthesized by electrodepositing Au nanoparticles onto the surface of WO3 nanoflowers that were grown on TiO2 nanotubes and applied, for the first time, to the surface-enhanced Raman scattering (SERS) detection of dyes. Owing to their nanoflower structure, a localized surface plasmon resonance was generated on the surface of the Au/WO3/TiO2 nanosheets, which brings about multiple enhanced three-dimensional electromagnetic fields. An enhanced factor of 3.6 × 106 was achieved. The spot-to-spot change in the SERS intensity was less than 15% and the SERS substrate could be preserved for at least 50 days. The analysis of dyes in real samples provided a recovery rate of 94.33–115.6%, indicating its potential applications in environmental analysis.
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JOURNAL OF LUMINESCENCE
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2017
·
IF 2.686
Jinshui Liu,Bin Wang,Meijiao Xu,Lizhen Wang,Zihan Zhou
Polyethyleneimine-capped Cu nanoclusters (PEI-CuNCs) with a mean diameter of 2.5 nm and that emitted blue light at 485 nm were synthesized. The fluorescence of PEI-CuNCs was strongly quenched when Au(III) ions were present. Because of this specific response, a PEI-CuNC-based fluorescent turn-off sensor was developed. Under optimum conditions, a good linear relationship (R 2 =0.993) was found between the relative fluorescence intensity ( F 0 / F ) and the Au(III) ion concentration between 0.5 and 15 µM. The detection limit for Au(III) ions was 0.06 µM. The quenching mechanism was assessed by performing X-ray photoelectron spectroscopy spectra studies. The fluorescence quenching was ascribed to photo-induced electron transfer from the PEI-CuNCs to the AuCl 4 − occur. Using The method described is a new way of quantifying Au(III) ions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Zhihai Cao,Hangnan Chen,Yi Shang,Yushan Zhang,Dongming Qi,Ulrich Ziener
Rice roll-like (RR-like) Au/SiO 2 nanocatalysts (NCs) were synthesized through simultaneous sol–gel process of tetramethoxysilane and 3-aminopropyltriethoxysilane (APTES) and in situ reduction of gold salt in inverse miniemulsions. APTES played an important role in formation of RR-like SiO 2 nano-supports, reduction of gold salts to narrowly size-distributed sub–10 nm Au nanoparticles (NPs), and improved attachment of Au NPs to the SiO 2 nano-supports. The prepared RR-like Au/SiO 2 NCs displayed a pH-dependent, reversible colloidal stability in water, which facilitated to recycle them through tuning the pH value of the dispersion. Most importantly, the catalytic activity of the RR-like Au/SiO 2 NCs towards reduction of p -nitrophenol was about 7–9 times higher than that of the raspberry-like Au/SiO 2 NCs reported in our previous paper (Colloids Surf. A, 489, 2016, 223–233). The formation mechanism of the RR-like Au/SiO 2 NCs was also discussed.
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Nanoscale
·
2017
·Vol. 9
·期 41
·15990-15997
·
IF 7.367
Jiajia Zhang,Fang Cui,Linxu Xu,Xinzi Pan,Xiaoqiang Wang,Xiao Zhang,Tieyu Cui
Herein, a novel and facile high-yield strategy is reported to efficiently fabricate 1D self-supported Au/CaO nanocatalysts using dual metal co-ordination polymers as templates. Significantly, a uniform distribution of dual metal nanoparticles can be ensured due to the fact that both Ca2+ and Au3+ ions are initially introduced into the co-ordination polymer via chemical bonding with bifunctional organic linkers and then, the Au and CaO nanoparticles are formed simultaneously in one pot via calcination. Furthermore, the as-prepared Au/CaO nanoribbons exhibit excellent catalytic performance in the transesterification reaction, which can be attributed to the small size and high distribution of CaO nanoparticles as well as the special 1D structure with high surface area. Moreover, leaching and deactivation, which are the main problems of CaO-based catalysts, are remarkably reduced due to the presence of hydrophobic Au nanoparticles on the surface of the CaO nanoribbons. Consequently, the Au/CaO nanoribbons can be used as recyclable catalysts with high activity for biodiesel production.
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PubMed
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Hao Deng,Shangyao Mo,Yong Xie,Rong Chen
This study presents a novel electrochemical biosensor for the detection of Helicobacter pylori VacA protein using a graphene-Au nanocomposite platform. The nanocomposite was synthesized via a one-pot reduction method and characterized using SEM, XRD, and FTIR. The biosensor fabrication process was monitored through cyclic voltammetry and electrochemical impedance spectroscopy. Optimization studies revealed ideal conditions of pH 7.4, 30-minute incubation time, and 100 μg/mL antibody concentration. The biosensor exhibited a linear response range of 0.1–100 ng/mL with a detection limit of 0.03 ng/mL. Selectivity tests against common interfering substances showed minimal cross-reactivity (<5 % signal change). The sensor demonstrated good reproducibility (3.8 % RSD) and stability (95 % signal retention after 30 days). In spiked serum samples, recoveries ranged from 96.5 % to 103.2 % with RSDs below 4.5 %. Compared to traditional methods, this biosensor offers improved sensitivity and shorter analysis time for VacA detection, potentially enhancing early diagnosis of H. pylori infections and monitoring treatment efficacy.
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OPTICAL MATERIALS
·
2024
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IF 3.8
Chengyun Zhang,Haoran Wu,Yu Xing,Qingxin Yin,Jianxia Qi,Qingyan Han,Wei Gao,Jun Dong
Using the capillary force-assisted self-assembly method, the enhancement system for photoluminescence was simply and effectively constructed, consisting of a layer of Au nanoparticle arrays uniformly assembled on the inner wall of the capillary and a further layer of hexagonal rare-earth doped nanoparticle core-shell structures assembled on its surface. It was found that the solution had a significant effect on the self-assembly process of the enhanced system, and the use of anisole as a solvent was more conducive to the construction of a homogeneous rare-earth doped nanoparticle film. In addition, the density of Au nanoparticles also modulated the enhancement effect of up-conversion luminescence and the optimal particle density conditions were determined by comparison. And the overall enhancement effect of surface plasmon resonance assisted up-conversion luminescence was analyzed in terms of the correlation of photoluminescence with the changes in excitation intensity and emission lifetime, as well as the significant increase in the red-to-green ratio. The results contribute to the construction of effective regulatory structures for up-conversion luminescence, which has important applications in the field of spectral sensing technology.
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RSC Advances
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2024
·Vol. 14
·期 32
·23011-23022
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IF 3.9
Ying Xu,Shuili Yu,Cong Huang,Zheng Xu
The photo-reduction of bromate (BrO3−) has attracted much attention due to the carcinogenesis and genotoxicity of BrO3− in drinking water. In this study, a heterojunction photocatalyst was developed by depositing Au nanoparticles (NPs) onto P25 TiO2 NPs through a one-pot, solvent-thermal process. Due to the unique properties of Au, the Au NPs deposited on the TiO2 surface created a Schottky barrier between the metal and the semiconductor, leading to an effective separation of photo-generated charge carriers as the Au nanoparticles served as electron sinks. The Au/TiO2 photocatalyst demonstrated efficient reduction of BrO3− under UV light illumination without the need for sacrificial agents. The effect of different Au loading of Au/TiO2 was systematically investigated for its influence on the generation of electrons and the reduction ability of BrO3−. The results indicate that the 1% Au/TiO2 catalyst exhibited a higher concentration of localized electrons, rendering it more effective in BrO3− removal. The photocatalytic efficiency for BrO3− reduction decreased upon the addition of K2S2O8 as an electron quencher, suggesting that the primary factor in this photo-reduction process was the availability of electrons. These findings hold promise for the potential application of the Au/TiO2 catalyst in the removal of BrO3− from drinking water through photo-reduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dilong Zhang,Chengting Wang,Mingzhu Xiao,Lu Gan,Xiujie Yang,Yong Xie,Qi Sun
In this study, a novel CoOOH/AuNPs nanozyme was synthesized through a two-step process by integrating gold nanoparticles (AuNPs) with cobalt oxyhydroxide (CoOOH) nanosheets. The CoOOH/AuNPs nanozyme exhibits significant oxidase and peroxidase (POD)-like activities, with a marked enhancement in POD-like activity attributed to the presence of AuNPs. This advancement facilitates the catalytic decomposition of hydrogen peroxide (H 2 O 2 ) into hydroxyl radicals (·OH), which subsequently oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB) to form blue oxidized TMB (ox-TMB) with an absorbance peak at 652 nm. The CoOOH/AuNPs nanozyme's stability was evaluated and was found to be superior to that of natural horseradish peroxidase (HRP), maintaining over 90 % activity after a 30-day period at room temperature. Steady-state kinetic studies confirmed the nanozyme's higher affinity and quicker reaction rate for the TMB substrate compared to HRP. The POD-like catalytic mechanism was investigated, highlighting the essential role of ·OH in the catalytic reaction. A colorimetric sensing platform was then fabricated for H 2 O 2 detection in chicken feet with pickled peppers, demonstrating high sensitivity and selectivity. This study presents a significant advancement in the field of nanozyme-based sensors for food safety applications.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2017
·
IF 4.784
Xinzhi Wang,Yurong He,Meijie Chen,Yanwei Hu
Direct absorption solar collector (DASC) is a promising technology for solar energy harvesting . Recently, nanofluids have shown great potential for DASC applications due to their tunable optical absorption properties . An advanced composite combining plasmonic gold nanoparticles (Au NPs) and hedgehog-like hierarchically structured ZnO particles (HPs) was prepared and used in DASCs. The nanofluid prepared with 1.0 mg mL −1 HP-Au exhibited excellent stability and broadband optical absorption properties, and reached an equilibrium temperature of ~125 °C within 1 h of solar heating at an irradiation power of 10 kW m −2 . A new photothermal conversion efficiency model was established to evaluate the solar harvesting performance of the HP-Au/oil nanofluid by simultaneously considering the effect of the working fluid temperature on the heating and cooling efficiencies. Compared to the base fluid, the HP-Au/oil nanofluid exhibits a 240% enhancement in photothermal conversion efficiency. The HP-Au/oil nanofluid shows great potential as a working fluid in direct absorption solar collectors.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wei Gao,Jinglei Zhang,Lin Shao,Jiaxi Li,Peng Ding,Qingyan Han,Xuewen Yan,Chenyun Zhang,Jun Dong
Enhancing upconversion luminescence in rare-earth materials through the plasmonic effects of precious metals has emerged as a highly effective strategy. In this study, we explore three distinct self-assembly techniques to fabricate alloy nano-film substrates using silver-coated gold (Au@Ag) core-shell nanoparticles, each with unique structural attributes. To enhance the upconversion luminescence of Er 3+ ions, we combine these substrates with NaYF 4 :Yb 3+ /Er 3+ nanoparticles, creating NaYF 4 :Yb 3+ /Er 3+ /Au@Ag composite nanostructures. The upconversion emission of Er 3+ ions is observably boosted when directly combined with Au@Ag nano-films of various structures under a 980 nm laser excitation. Surprisingly, incorporating a NaYF 4 inert shell as an isolating layer results in a remarkable 13.7-fold enhancement of upconversion luminescence in the NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 /Au@Ag composite structure relative to isolated NaYF 4 : Yb 3+ /Er 3+ nanoparticles. The enhancement mechanism was carefully discussed based on spectral characteristics and luminous lifetime. It was found that the enhanced upconversion emission of nanoparticles on differently structured substrates is primarily driven by excitation enhancement. The composite rare-earth and metal nanoparticle structures fabricated in this investigation not only effectively enhance material spectral properties effectively but also streamline the process by employing an inert NaYF 4 shell as an isolation layer. This novel approach offers a promising avenue for developing efficient luminescent material systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengyuan Shen,Anli Wang,Jianlin Chen,Siyao Song,Wenyan Hou,Yunpeng Li,Jiayu Zhang,Jiamin Yuan,Fei Shen,Xiaogang Han
Aqueous Zn-ion batteries (AZIBs) have attracted widespread attention owing to the feature of low cost, inherent safety and eco-friendliness. However, the poor reversibility of Zn anode severely hinders the practical applicability of AZIBs. Separator modification is an effective way to functionalize the electrode/electrolyte interface and improve the cycling performance. Here, we propose a modified glass fiber separator with Au coating (Au@GF), which could realize uniform Zn 2+ distribution at the electrode/electrolyte interface and regulate the plating/stripping behaviors, achieving a dense and homogenous deposition. Zn||Zn symmetric cells assembled with Au@GF separator demonstrate evidently prolonged cycle life over 1600 h at the current density of 5 mA cm −2 and the capacity of 1 mAh cm −2 , while symmetric cells with GF fail in less than 40 h. Even at the condition of 15 mA cm −2 /3 mAh cm −2 , lifespan of Zn||Zn cells with Au@GF is extended to 750 h, which is more than 3 times compared with that of GF. The modified separator with highly conductive coating is capable of a longtime stable Zn plating/stripping. Moreover, an enhanced cycling performance is also detected in a series of full cells with different cathode materials. This work provides an easy and efficient approach to homogenize Zn 2+ deposition.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Dan Chen,Ming Zhai,Jing Zhang,Liqi Miao,Kan Li,Zhong Wang,Xiaozhi Wang
Gold-based catalysts are renowned for their exceptional low-temperature oxidation activity and have found widespread application in the thermos catalytic oxidation of formaldehyde (HCHO). In this study, an in-situ hydrothermal synthesis method was employed to prepare Au 0.5 Ni x /ATP catalysts. By altering the doping amount of Ni during the synthesis process, the impact of Ni doping on the catalytic reactivity was investigated. Compared to pure gold-based catalysts, the dispersion and sintering resistance of the Au 0.5 Ni x /ATP catalysts were enhanced. The OH - ions present in the alkaline solution provided by TPAOH disrupted the morphology of ATP, leading to a flocculent appearance for the Au 0.5 /ATP catalyst. With varying doping levels of Ni, the rod-like structure of ATP gradually recovered due to the strong interaction between Ni 2+ and OH-. On the Au 0.5 Ni x /ATP catalysts, NiO, being a p-type semiconductor, was prone to electron loss, with the lost electrons being captured by Au 3+ to form Au 0 and stronger Au and Ni interactions. When Ni species were introduced onto the Au/ATP surface, the synergistic effect between Au and Ni resulted in higher catalytic activity, favoring the catalytic oxidation of HCHO. The catalytic efficiency peaked when the Ni doping level reached 20 wt%.
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