Gold Bulletin最新文献_第10页

Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation 配体保护金颗粒的电催化活性:甲醛氧化

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-10-07 DOI: 10.1007/s13404-013-0110-0

Kun Luo, Haiming Wang, Xiaogang Li

{"title":"Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation","authors":"Kun Luo, Haiming Wang, Xiaogang Li","doi":"10.1007/s13404-013-0110-0","DOIUrl":"https://doi.org/10.1007/s13404-013-0110-0","url":null,"abstract":"Tris(hydroxymethyl)phosphine oxide (THPO) and triphenyl phosphine oxide (PPh3O) were introduced onto the surface of colloidal gold nanoparticles (Au NPs), and the effect of capping ligands on the catalytic electrooxidation of formaldehyde was studied voltammetrically by using colloidal Au-NP-modified glassy carbon electrodes (GCEs). This was compared with polycrystalline Au and another Au-NP-modified GCE without a capping molecule. We found that PPh3O causes a larger decrease in the catalytic activity of the Au NPs in liquid than THPO does, indicating that the catalytic activity of the Au NPs is closely associated with the capping ligands. The effect of capping ligands is discussed based on the available surface ratio (ASR), which is defined as the ratio of the total surface area measured electrochemically to the calculated value based on the number and geometry of the Au NPs. These were determined to be 70.6?% for THPO and 0.23?% for PPh3O, respectively. The significant blocking of formaldehyde is probably due to the structure and hydrophobicity of the benzene rings in the PPh3O molecule, which is responsible for the decrease in catalytic activity of the Au NPs.","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2013-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-013-0110-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4316076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Electron transfer processes on Au nanoclusters supported on graphite 石墨负载金纳米团簇的电子转移过程

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-10-05 DOI: 10.1007/s13404-013-0109-6

Jie Shen, Juanjuan Jia, Kirill Bobrov, Laurent Guillemot, Vladimir A. Esaulov

引用次数: 10

Gold, and lots of it 金子，很多金子

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-09-12 DOI: 10.1007/s13404-013-0104-y

Trevor Keel

引用次数: 0

Highlights from recent literature 近期文献亮点

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-08-29 DOI: 10.1007/s13404-013-0105-x

引用次数: 0

On the selection and design of proteins and peptide derivatives for the production of photoluminescent, red-emitting gold quantum clusters 制备光致发光、发红金量子团簇所需蛋白质和肽衍生物的选择和设计

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-08-01 DOI: 10.1007/s13404-013-0100-2

Balázs Söptei, Lívia Naszályi Nagy, Péter Baranyai, Ildikó Szabó, Gábor Mező, Ferenc Hudecz, Attila Bóta

{"title":"On the selection and design of proteins and peptide derivatives for the production of photoluminescent, red-emitting gold quantum clusters","authors":"Balázs Söptei, Lívia Naszályi Nagy, Péter Baranyai, Ildikó Szabó, Gábor Mező, Ferenc Hudecz, Attila Bóta","doi":"10.1007/s13404-013-0100-2","DOIUrl":"https://doi.org/10.1007/s13404-013-0100-2","url":null,"abstract":"Novel pathways of the synthesis of photoluminescent gold quantum clusters (AuQCs) using biomolecules as reactants provide biocompatible products for biological imaging techniques. In order to rationalize the rules for the preparation of red-emitting AuQCs in aqueous phase using proteins or peptides, the role of different organic structural units was investigated. Three systems were studied: proteins, peptides, and amino acid mixtures, respectively. We have found that cysteine and tyrosine are indispensable residues. The SH/S-S ratio in a single molecule is not a critical factor in the synthesis, but on the other hand, the stoichiometry of cysteine residues and the gold precursor is crucial. These observations indicate the importance of proper chemical behavior of all species in a wide size range extending from the atomic distances (in the AuI-S semi ring) to nanometer distances covering the larger sizes of proteins assuring the hierarchical structure of the whole self-assembled system.","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-013-0100-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4005909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts Au作为甲酸和一氧化碳电催化氧化的有效促进剂:Pt-on-Au和PtAu合金催化剂的比较

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-07-19 DOI: 10.1007/s13404-013-0098-5

Qiang Zhang, Ruirui Yue, Fengxing Jiang, Huiwen Wang, Chunyang Zhai, Ping Yang, Yukou Du

{"title":"Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts","authors":"Qiang Zhang, Ruirui Yue, Fengxing Jiang, Huiwen Wang, Chunyang Zhai, Ping Yang, Yukou Du","doi":"10.1007/s13404-013-0098-5","DOIUrl":"https://doi.org/10.1007/s13404-013-0098-5","url":null,"abstract":"The absence of unpaired d-electrons of gold leads to its lack of reactivity and paucity of catalytic activity. Synergistic activity of bimetallic PtAu has been proved, and its structure greatly influences on the electrocatalytic activity toward formic acid and carbon monoxide oxidation. Here, a comparison between Pt-modified Au (designated as Pt-on-Au) and PtAu alloy catalysts has been studied. The Pt-on-Au catalyst was prepared by electrodeposition of Pt on the pre-prepared Au, while PtAu alloy was obtained by co-electrodeposition. As a whole, both types of PtAu catalysts were found to be more active toward formic acid electrooxidation compared to pure Pt, exhibiting maximum activity on Pt-on-Au catalyst with Pt to Au atomic ratio of 1:10.22. Moreover, the Pt/Au atomic ratio directly relates to the oxidation pathway of formic acid and carbon monoxide oxidation. The results may be ascribed to much less COads on the surface than single Pt catalyst due to the effect of Au nanoparticles. CO stripping voltammograms present the obvious variation between Pt-on-Au and PtAu alloy catalysts. Meanwhile, the electrocatalytic activities of bimetallic PtAu are evaluated by electrochemical impedance spectroscopy and Tafel analysis.","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2013-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-013-0098-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4750487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

Green biosynthesis of gold nanometre scale plates using the leaf extracts from an indigenous Australian plant Eucalyptus macrocarpa 利用澳大利亚本土植物巨桉叶提取物的绿色生物合成金纳米尺度板

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-07-02 DOI: 10.1007/s13404-013-0096-7

Gérrard Eddy Jai Poinern, Peter Chapman, Xuan Le, Derek Fawcett

引用次数: 42

Highlights from recent literature 近期文献亮点

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-06-18 DOI: 10.1007/s13404-013-0095-8

引用次数: 3

Gold and diagnostics—some staggering numbers 黄金和诊断学——一些惊人的数字

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-06-14 DOI: 10.1007/s13404-013-0097-6

Trevor Keel

引用次数: 1

Simultaneous determination of uric acid and dopamine using a carbon fiber electrode modified by layer-by-layer assembly of graphene and gold nanoparticles 使用石墨烯和金纳米颗粒逐层组装修饰的碳纤维电极同时测定尿酸和多巴胺

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2013-05-19 DOI: 10.1007/s13404-013-0090-0

Jiao Du, Ruirui Yue, Fangfang Ren, Zhangquan Yao, Fengxing Jiang, Ping Yang, Yukou Du

{"title":"Simultaneous determination of uric acid and dopamine using a carbon fiber electrode modified by layer-by-layer assembly of graphene and gold nanoparticles","authors":"Jiao Du, Ruirui Yue, Fangfang Ren, Zhangquan Yao, Fengxing Jiang, Ping Yang, Yukou Du","doi":"10.1007/s13404-013-0090-0","DOIUrl":"https://doi.org/10.1007/s13404-013-0090-0","url":null,"abstract":"A novel layer-by-layer assembly of graphene sheets and gold nanoparticles modified carbon fiber electrode (GE/Au/GE/CFE) was successfully fabricated and applied to simultaneous determination of dopamine (DA) and uric acid (UA). The structure of GE/Au/GE/CFE was characterized by scanning electron microscopy (SEM). It was observed that the gold nanoparticles were homogeneously assembled between the two layers of GE sheets. Cyclic voltammetry (CV) measurements elucidate that GE/Au/GE/CFE has higher electrocatalytic activity for the oxidation of DA and UA when compared with graphene modified carbon fiber electrode (GE/CFE), and graphene and gold nanoparticles modified carbon fiber electrode (Au/GE/CFE). Simultaneous determination of UA and DA on GE/Au/GE/CFE was conducted with a differential pulse voltammetry technique, and two well-defined and fully resolved anodic oxidation peaks were observed. Anodic oxidation currents of DA and UA are linear with their concentration in the range of 0.59–43.96?μM and 12.6–413.62?μM, respectively. Moreover, the composite electrode displays high reproducibility and selectivity for the determination of UA and DA.","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2013-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-013-0090-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4757222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 67