JOURNAL OF NANOPARTICLE RESEARCH
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2021
·Vol. 23
·期 1
·1-12
·
IF 2.253
Zhang Gongguo,Liu Zhiang,Fu Xiaowei,Zhao Wenjun,Yin Xunxiao,Niu Xiankang,Kong Rongmei,Qu Fengli,Zheng Yiqun
Branched Au nanocrystals with sub-10-nm arms are synthesized via a one-pot reduction in aqueous phase. The success of current work relies on the use of octadecyltrimethylammonium chloride as the shape-directing capping agent to facilitate the formation of branched products in high purity. Their overall size could be controlled in the range of 16–60 nm by varying the Au precursor amount or concentration of capping agent, and the diameter of arms is limited to sub-10-nm size range. Interestingly, Au nanocrystals with a unique morphology, sheet-wrapped dendrites, could be obtained when the concentration of a reductant was varied. The current strategy is also validated effective in the fabrication of dendritic products composed of other noble metals or alloys in addition to Au by simply using the alternative metal precursor. As compared to spherical counterparts, the current branched Au nanocrystals exhibited noticeable red-shift in UV-Vis extinction spectrum and enhanced catalytic activities for electrooxidation of ethanol in alkaline media. Graphical abstract
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Catalysts
·
2020
·Vol. 10
·期 10
·1192
·
IF 3.52
Jun Yan,Longlong Shan,Xiaoli Gu,Xingguang Zhang,Junmeng Cai
Three series of catalysts consisting of gold (Au), platinum (Pt), or gold-platinum bimetallic nanoparticles (NPs) with controlled sizes (Au NPs 10 ± 2 nm, Pt NPs 6 ± 2 nm) anchored on hierarchical micro-/meso-/macroporous silica were successfully developed and systematically evaluated for the selective oxidation of aromatic alcohols to their corresponding aldehydes. The catalysts were prepared by the sol-immobilization method using as-made Au NPs and/or Pt NPs colloids; the silica supports were prepared with controlled pore structures and the hierarchical porous structures of catalysts were created by controllable desilication via the alkaline solution of the metal colloids. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), and these results showed no synergistic effect between Au and Pt on boosting the catalytic performance, whereas they demonstrated a clear dependence of catalytic conversions and reaction rates on the structural porosity of Au-Pt bimetallic catalysts. Our findings could potentially inspire peer researchers and scientists to develop designer porous catalysts and processes in the selective organic conversions.Keywords:steric effect;Au-Pt catalysts;alcohol oxidation;hierarchical porous silica
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MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Ziyin Yang,Xiao Bai
This paper reports the synthesis of S-doped thin Co 3 O 4 shell with Au flower as core for nonenzymatic glucose sensing, where Au@Co 3 O 4 was obtained through assembly process triggered by redox reaction of Co 2+ and Au 3+ , and then S was doped into Co 3 O 4 shell via a hydrothermal process. The morphology, composition and structure of Au@Co 3 O 4 -S were characterized by transmission electron microscopy and X-ray diffraction, which showed that the core–shell structure was composed with Au core flower and S-doped thin Co 3 O 4 shell. Electrochemical property of Au@Co 3 O 4 -S toward glucose was explored, and an excellent electrocatalytic performance with a wide linear range of 0.2 μM–3.1 mM, a high sensitivity of 1127.3 μA mM −1 cm −2 and a low detection limit of 0.09 μM (S/N = 3) was obtained, which may be due to that the low conductivity of Co 3 O 4 was mitigated by conductive Au core flower and S doping, therefore making thin Co 3 O 4 shell provide more effective active sites for glucose reaction. Considering such excellent results, Au@Co 3 O 4 -S was proven as a promising material for electrochemical sensing of glucose.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 45
·期 3
·1231-1239
·
IF 3.288
Jiajia Li,Yun Zhao,Xiuxun Han,DingShu Xiao
The design of highly efficient and stable photoelectrocatalysts for the hydrogen evolution reaction (HER) is critical to the large-scale application of clean hydrogen energy. Here, Cu3BiS3 nanoflowers (NFs) with photoelectrochemical (PEC) activity were synthesized via a solvothermal method under mild and low-toxic reaction conditions, and the Au nanoparticles (Au NPs) were loaded onto Cu3BiS3 NFs to improve the photoelectrocatalytic performance. Compared with pure Cu3BiS3 NFs, Au-Cu3BiS3 composites (A@C) exhibit a much higher photocurrent density (2 × 10−4 A cm−2) and greatly enhanced photoelectrocatalytic activity (2.31 μmol h−1), which are attributed to the enhancement in electron capture abilities, active sites and visible light absorption from the localized surface plasmon resonance effect (LSPR) of Au NPs. Furthermore, the excellent conductivity of Au NPs can effectively accelerate the separation and collection of photogenerated carriers. This work highlights a feasible strategy to improve the PEC activity of the Cu3BiS3 photoelectrocatalyst, and confirms the great potential of Au-Cu3BiS3 composites for hydrogen evolution applications.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 3
·1189-1195
·
IF 1.938
Li Ke,Chen Tingting,Mao Huibing,Chen Ye,Wang Jiqing
YVO 4 :Yb 3+ :Er 3+ nanoparticles and their mixture with Au nanoparticles have been fabricated by a simple chemical method. With the excitation of a 975-nm laser, both samples had strong upconversion emissions at 2.18, 2.25, and 2.36 eV, which correspond to the transitions 4 F 9/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 and 2 H 11/2 → 4 I 15/2 of Er 3+ ions, while the emission at 2.36 eV has a large overlap with the resonant absorption energy, 2.34 eV, of the Au nanoparticles. With the coupling of the Au nanoparticles, the upconversion emission at 2.36 eV presents a strong quenching effect which is due to the energy transfer from the Er 3+ ions to the Au nanoparticles. This depends on the energy difference between the emission of the Er 3+ ions and the absorption of the Au nanoparticles. The upconversion power dependence shows that the slope factor of the power dependence is about 3 for a high pump power, which means that the upconversion process is a three-photon process for both samples.
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WATER RESEARCH
·
2020
·
IF 9.13
Dingyuan Liang,Xiangrui Wang,Ying Wang,Zhaomin Dong,Xiaoli Zhao,Wenhong Fan
Dissolved organic matter (DOM) in aquatic ecosystems reshapes the surface of nanoparticles (NPs) greatly. Understanding how these changes influence the bioavailability of NPs is critical for accurately predicting the ecological risks of NPs. A quantitative model based on the two-step internalization process enabled the differentiation between the adhesion ability of NPs to membranes and the internalization capacity. Using protozoa Tetrahymena thermophila as the test organism, fluorescein isothiocyanate-modified silica NPs (FITC-SiO 2 ) and silica-coated gold NPs (Au@SiO 2 ) were prepared to validate the model and study the influence of DOM on uptake. DOM reduced the ability of Au@SiO 2 to adhere onto cell membranes and the inhibitory effect of bovine serum albumin (BSA) and β-lactoglobulin was higher due to their higher molecular weights and the weaker interaction. Moreover, DOM increased the internalization capacity. 80% Au@SiO 2 was internalized in the presence of humic acid (HA), over 90% Au@SiO 2 was internalized in the presence of the two proteins, whereas only 60% were internalized by the control group. Next, the specific recognition of the cell internalization in the presence of DOM was confirmed. We concluded that the traditional “accumulation” may misestimate the true biological effect caused by NPs coated with DOM. NPs coated with highly bioavailable DOM pose a greater risk to aquatic ecosystems because they are more likely to be internalized by living organisms.
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Journal of Environmental Sciences
·
2020
·
IF 4.302
Hanyun Cheng,Xu Dong,Yang Yang,Yiqing Feng,Tao Wang,Muhammad Ali Tahir,Liwu Zhang,Hongbo Fu
Monolayer-ordered gold nanoring arrays were prepared by ion-sputtering method and used as surface enhanced Raman spectroscopy (SERS) substrates to test the individual atmospheric aerosols particle . Compared to other methods used for testing atmospheric aerosols particles, the collection and subsequent detection in our work is performed directly on the gold nanoring SERS substrate without any treatment of the analyte. The SERS performance can be tuned by changing the depth of the gold nanoring cavity as originating from coupling of dipolar modes at the inner and outer surfaces of the nanorings. The electric field exhibits uniform enhancement and polarization in the ordered Au nanoring substrate, which can improve the accuracy for detecting atmospheric aerosol particles. Combined with Raman mapping, the information about chemical composition of individual atmospheric aerosols particle and distribution of specific components can be presented visually. The results show the potential of SERS in enabling improved analysis of aerosol particle chemical composition, mixing state, and other related physicochemical properties .
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Analytical Methods
·
2020
·Vol. 12
·期 21
·2693-2702
·
IF 2.596
Meihua Liu,Longhua Guo,Yuechun Yin,Lifen Chen,Zhitao Chen,Jingjing Liu,Bin Qiu
In this work, a novel method based on gold nanoparticle preconcentration coupled with CE for electrochemiluminescence detection of ciprofloxacin, enrofloxacin, ofloxacin, and norfloxacin in European eels was developed. The addition of gold nanoparticles induced the rapid enrichment of fluoroquinolones, which was simpler than the conventional enrichment approaches such as solid phase extraction and solid-phase microextraction. More than 100 times enrichment was observed after gold nanoparticle aggregation-based preconcentration. The CE-electrochemiluminescence parameters that affected the separation and detection were optimized. Under the optimized conditions, the linear ranges for the four fluoroquinolones were 0.090–8.0 μmol L−1 with the detection limits between 0.020 and 0.050 μmol L−1. The proposed approach showed the advantages of high sensitivity, high selectivity, a wide linear range, and a low detection limit. It was used to analyze fluoroquinolones in European eel, and the results showed that the developed method can satisfy the detection requirements for fluoroquinolone determination in aquatic products set by China and the European Union.
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MATERIALS CHARACTERIZATION
·
2020
·
IF 3.562
Shuai Ma,Fengjin Xia,Lifeng Dong,Ruibin Jia,Zhenzong Sha,Jie Wang,Yingjie Chen,Beili Pang,Hongzhou Dong,Liyan Yu
Coupling plasmonic gold nanoparticles to sub-stoichiometric copper chalcogenide nanocrystals tends to generate promising nano-heterostructures. We report the research on plasmon-enhanced Cu 2 ZnSn(S 1 − x ,Se x ) 4 -Au nanocomposites (CZTSSe for 0 < x < 1, and CZTS if x = 0), emphasizing on exploring how hetero-epitaxial relationship at Cu 2 ZnSn(S 1 − x ,Se x ) 4 //Au interfaces affects their optoelectronic properties. Digital image processing tools, fast Fourier transform/Fourier inversion, are utilized to extract interfacial epitaxial orientations. We demonstrate that nonnegligible lattice mismatch in short-range order could be equivalently compensated by coincident lattice-matching at certain periodic intervals in a long-range order. By exploring polytypic CZTSSe, we further provide reasonable interpretation of abnormal symmetrical distribution of Au on CZTSSe, which induces lower gold coverage rate and accordingly moderates their localized surface plasmon resonance effect, compared to that of CZTS. It indicates that the shape and phase of CZTSSe should be elaborately controlled to realize optimal multi-site nucleation of heterostructured nanocomposites. As a result, by testing optoelectronic response of solar cells with Cu 2 ZnSn(S 1 − x ,Se x ) 4 -Au films as counter electrodes (CEs), we confirm that a superior hetero-epitaxial interconnection between Au and Cu 2 ZnSn(S 1 − x ,Se x ) 4 can availably restrain interfacial defects of the junction and thus contribute efficient hole transfer/transportation in cathode region. The corresponding balanced electron and hole migration plays a quite significant role in the improvement of open-circuit voltage ( V oc ) and fill factor of photovoltaic devices .
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Catalysts
·
2020
·Vol. 10
·期 5
·539
·
IF 3.52
Lan Luo,Tingting Zhang,Xin Zhang,Rongping Yun,Yanjun Lin,Bing Zhang,Xu Xiang
Hydrogen production by photoreforming of biomass-derived ethanol is a renewable way of obtaining clean fuel. We developed a site-specific deposition strategy to construct supported Au catalysts by rationally constructing Ti3+defects inTiO2nanorods and Cu2O-TiO2p-n junction across the interface of two components. The Au nanoparticles (~2.5 nm) were selectively anchored onto either TiO2nanorods (Au@TiO2/Cu2O) or Cu2O nanocubes (Au@Cu2O/TiO2) or both TiO2and Cu2O (Au@TiO2/Cu2O@Au) with the same Au loading. The electronic structure of supported Au species was changed by forming Au@TiO2interface due to the adjacent Ti3+defects and the associated oxygen vacancies while unchanged in Au@Cu2O/TiO2catalyst. The p-n junction of TiO2/Cu2O promoted charge separation and transfer across the junction. During ethanol photoreforming, Au@TiO2/Cu2O catalyst possessing both the Au@TiO2interface and the p-n junction showed the highest H2production rate of 8548 μmol gcat−1h−1under simulated solar light, apparently superior to both Au@TiO2and Au@Cu2O/TiO2catalyst. The acetaldehyde was produced in liquid phase at an almost stoichiometric rate, and C−C cleavage of ethanol molecules to form CH4or CO2was greatly inhibited. Extensive spectroscopic results support the claim that Au adjacent to surface Ti3+defects could be active sites for H2production and p-n junction of TiO2/Cu2O facilitates photo-generated charge transfer and further dehydrogenation of ethanol to acetaldehyde during the photoreforming.Keywords:ethanol reforming;hydrogen production;Au catalyst;Ti3+defect;site-specific deposition
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Nanoscale Advances
·
2020
·Vol. 2
·期 4
·1583-1589
·
IF 0
Feng Lv,Yuzhu Gong,Yingying Cao,Yaoyao Deng,Shufeng Liang,Xin Tian,Hongwei Gu,Jun-Jie Yin
Effective alcohol detection represents a substantial concern not only in the context of personal and automobile safety but also in clinical settings as alcohol is a contributing factor in a wide range of health complications including various types of liver cirrhoses, strokes, and cardiovascular diseases. Recently, many kinds of nanomaterials with enzyme-like properties have been widely used as biosensors. Herein, we have developed a convenient detection method that combines Au@PtRu nanozymes and alcohol oxidase (AOx). We found that the Au@PtRu nanorods exhibited peroxidase-like catalytic activity that was much higher than the catalytic activities of the Au and Au@Pt nanorods. The Au@PtRu nanorod-catalyzed generation of hydroxyl radicals in the presence of H2O2 was used to develop an alcohol sensor by monitoring the H2O2 formed by the oxidation of alcohol to acetaldehyde in the presence of AOx. When coupled with AOx, alcohol was detected down to 23.8 μM in a buffer solution for biological assays. Notably, alcohol was successfully detected in mouse blood samples with results comparable to that from commercial alcohol meters. These results highlight the potential of the Au@PtRu nanorods with peroxidase-like activity for alcohol detection, which opens up a new avenue for nanozyme development for biomedical applications.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Maosong Liu,Xin Jin,Shun Li,Jean-Baptiste Billeau,Tingyu Peng,Henan Li,Long Zhao,Zuotai Zhang,Jerome P. Claverie,Luca Razzari,Jianming Zhang
Recently, localized surface plasmon resonances (SPRs) of metallic nanoparticles (NPs) have been widely used to construct plasmonic nanohybrids for heterogeneous photocatalysis. For example, the combination of plasmonic Au NPs and TiO2 provides pure TiO2 visible-light activity. The SPR effect induces an electric field and consequently enhances light scattering and absorption, favoring the transfer of photon energy to hot carriers for catalytic reactions. Numerous approaches have been dedicated to the improvement of SPR absorption in photocatalysts. Here, we have designed a core@shell–satellite nanohybrid catalyst whereby an Ag NP core, as a plasmonic resonator featuring unique dual functions of strong scattering and near-field enhancement, is encapsulated by SiO2 and TiO2 layers in sequence, with Au NPs on the outer surface, Ag@SiO2@TiO2–Au, for efficient plasmonic photocatalysis. By varying the size and number of Ag NP cores, the Au SPR can be tailored over the visible and near-infrared spectral region to reabsorb the scattered photons. In the presence of the Ag core, the incident light is efficiently confined in the reaction suspension by undergoing multiple scattering, thus leading to an increase of the optical path to the photocatalysis. Moreover, using numerical analysis and experimental verifications, we demonstrate that the Ag core also induces a strong near-field enhancement at the Au–TiO2 interface via SPR coupling with Au. Consequently, the activity of the TiO2–Au plasmonic photocatalyst is significantly enhanced, resulting in a high H2 production rate under visible light. Thus, the design of a single structural unit with strong scattering and field enhancement, induced by a plasmonic resonator, is a highly effective strategy to boost photocatalytic activity.
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