On-paper synthesis of Au nanocatalysts from Au(III) complex ions for low-temperature CO oxidation

Koga, Hirotaka; Kitaoka, Takuya; Wariishi, Hiroyuki

doi:10.1039/b905818d

Cited by 24 publications

(18 citation statements)

References 34 publications

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“…The as-prepared paper composite, denoted as AuNPs @ ZnO paper, is like a flexible and easy-to-handle cardboard, and possesses a porous fiber-network microstructure. In both the liquid-phase 4-NP reduction process and the gas-phase CO oxidation process, the AuNPs @ ZnO paper exhibited excellent practical utility and high catalytic reactivity [30,34,35]. This facile technique can be extended to various metal NPs, and thus has potential applicability for the on-paper synthesis of bimetallic hybrid nanocatalysts for further functionalization.…”

Section: Introductionmentioning

confidence: 96%

“…For example, the "on-paper" synthesis of AuNPs was successfully achieved as follows [30,34,35]: Firstly, ZnO whiskers are incorporated into a ceramic paper matrix using our established papermaking technique. The ZnO whisker-containing paper composite (ZnO paper) is then simply immersed in an aqueous solution of HAuCl 4 , leading to the selective formation of AuNPs on the ZnO whiskers.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous reports, the facile and direct in situ synthesis of metal NPs, such as copper (Cu) NPs [28][29][30], silver (Ag) NPs [31,32], PtNPs [29,30,33] and AuNPs [30,34,35], has been achieved using an easy-to-handle paper matrix, composed of ceramic fibers as the main framework and zinc oxide (ZnO) whiskers as a selective scaffold for the synthesis of metal NPs. For example, the "on-paper" synthesis of AuNPs was successfully achieved as follows [30,34,35]: Firstly, ZnO whiskers are incorporated into a ceramic paper matrix using our established papermaking technique.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

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Bimetallic nanoparticles have attracted significant attention as their electrochemical and catalytic properties being superior to those of the individual component nanoparticles. In this study, gold-silver hybrid nanoparticles (AuAgNPs) with an Au core -Ag shell nanostructure were successfully synthesized on zinc oxide (ZnO) whiskers. The as-prepared nanocatalyst, denoted AuAgNPs @ ZnO whisker, exhibits an excellent catalytic efficiency in the aqueous reduction of 4-nitrophenol to 4-aminophenol; the turnover frequency was up to 40 times higher than that of each component nanoparticle. Their unique features were attributed to the electronic ligand effect at the bimetallic interface. In addition, the AuAgNPs were synthesized on a ZnO whisker-containing paper with a fiber-network microstructure, which was prepared via a papermaking technique. The paper-structured AuAgNPs composite possessed both a paper-like practical utility and a good catalytic performance. Furthermore, the on-paper synthesis process for these bimetallic nanocatalysts is facile. These easy-to-handle nanocatalyst hybrid composites are expected to find a wide range of applications in various chemical and catalytic processes.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

2011

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“…AuNPs with particle size <10 nm are spontaneously formed on ZnO whiskers via a simple soaking treatment with HAuCl 4 solution (Fig. 13), possibly due to electron transfer from Zn(II) in ZnO whiskers to Au(III) species through Zn-O-Au bonds (Koga et al, 2009c). As-prepared AuNPs@ZnO paper has excellent catalytic performance in low-temperature CO oxidation.…”

Section: Aunps@zno Paper For Low-temperature Co Oxidationmentioning

confidence: 99%

On-Paper Synthesis of Silver Nanoparticles for Antibacterial Applications

Koga¹,

Kitaoka²

2010

Silver Nanoparticles

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“…For the on-paper synthesis of CuNPs [30], ZnO paper was cut into circular-shaped disks (8 × 10 2 mm 2 ) and immersed in an aqueous solution of copper nitrate (Cu(NO3)2) for 20 min. The disks were then removed from the solution, followed by thorough washing with deionized water, drying at 105°C for 3 h and reduction in hydrogen at 250°C for 1.5 h. To prepare the PtNPs@ZnO paper [31], ZnO paper was immersed in an aqueous solution of chloroplatinic acid (H2PtCl6) for 48 h. The treated disks were then washed with deionized water and reduced in an aqueous solution of sodium borohydride (NaBH4) for 3 min, followed by thorough washing with deionized water and drying at 105°C for 3 h. For AuNPs@ZnO paper [32,33], ZnO paper was soaked in an aqueous solution of tetrachloroauric acid (HAuCl4) for 6 h. The disks were then removed from the solution, washed with deionized water and dried at 105°C for 3 h. The metal NPs@ZnO whiskers (not a paper shape) were prepared in a similar manner. The characterization of the as-prepared metal NPs@ZnO whiskers and paper was conducted by atomic absorption analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffractometry (SAED), confocal laser scanning microscopy (CLSM), Xray diffractometry ( XRD ) , X-ray photoelectron spectroscopy (XPS) and mercury intrusion porosimetry.…”

Section: Preparation and Characterization Of Metal Nps@zno Papermentioning

confidence: 99%

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

Koga

Kitaoka²

2011

Sen-i Gakkaishi

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Metal catalysts have played essential roles in a wide range of chemical industrial processes [1][2][3]. For example, the copper/zinc oxide (Cu/ZnO) catalyst has been especially important for methanol synthesis [4] and alcohol reforming to produce hydrogen for fuel cell applications [5]. Energy, environmental and resource problems have escalated in recent times. Therefore, the development of high-performance catalytic materials that can effectively and selectively promote desired reactions is required for sustainability. Metal nanocatalystsNanosized metal particles have received an increasing amount of attention in various fields, such as in electronic [6], optical [7] and biomedical [8] applications, because of their unique and specific properties. In particular, the extremely large specific surface areas of metal nanoparticles (NPs) are very advantageous for effective catalytic reactions [9]. This has led to the active use of metal NPs as heterogeneous catalysts for a variety of industrial processes [9] including energy conversion, fine chemical synthesis and environmental cleanup. For example, gold (Au) nanocatalysts have received considerable interest for use in various reactions, including the reduction of 4-nitrophenol (4-NP) in the liquid phase [10] and low-temperature carbon monoxide (CO) oxidation [11] in the gas phase, even though bulk Au is typically regarded as an ineffective catalyst. However, the practical implementation of metal NPs is difficult, because they are difficult to handle and they aggregate easily, which minimizes their surface area. The aggregation of metal NPs results in the formation of ordinary bulk metals, and this consequently deteriorates their excellent functionalities. Therefore, catalytic metal NPs are generally attached to various support materials, such as polymers [9,12] and metal oxide powders [9,13]. Since these supported catalysts are fine and are handled with difficulty in practice, they are generally fashioned as beads or pellets. This eventually decreases their catalytic reactivity, because of the poor contact efficiency between the reactants and the catalytically active sites [14]. In addition, filling a reactor with solid catalysts can cause a high pressure drop, local reactant flow and an uneven thermal environment inside the catalyst layer, leading to an inefficient overall process, particularly for flow-type reactions. Therefore, establishing an efficient and practical immobilization technique that enables highly active metal NPs to be attached to and exposed on easyto-handle porous matrices is a challenge. On-paper Synthesis of Metal Nanoparticles for Catalytic ApplicationsDepartment of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan ( † Present address : Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan)Abstract: We discuss the successful in ...

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On-paper synthesis of Au nanocatalysts from Au(III) complex ions for low-temperature CO oxidation

Cited by 24 publications

References 34 publications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

In Situ Synthesis of Bimetallic Hybrid Nanocatalysts on a Paper-Structured Matrix for Catalytic Applications

On-Paper Synthesis of Silver Nanoparticles for Antibacterial Applications

On-paper Synthesis of Metal Nanoparticles for Catalytic Applications

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