Controlled synthesis of novel cyanopropyl polysilsesquioxane hollow spheres loaded with highly dispersed Au nanoparticles for catalytic applications

Dong, Feihong; Guo, Wanping; Park, Shin-Kyu; Ha, Chang‐Sik

doi:10.1039/c1cc14831a

Cited by 96 publications

(59 citation statements)

References 30 publications

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“…This catalyst exhibited high activity and reusability in the catalytic reduction of 4-NP by AuNPs (Fig. 5) [38]. Ionic polymers are another essential family of stabilizers for AuNPs in 4-NP reduction catalysis [39][40][41][42][43][44][45][46], because the ionic groups of the polymers increase the solubility of AuNP catalysts in aqueous media, thus improve catalytic activity.…”

Section: Other Polymer Stabilizersmentioning

confidence: 98%

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Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Zhao

Feng

Huang

et al. 2015

Coordination Chemistry Reviews

714

510

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Section: Other Polymer Stabilizersmentioning

confidence: 98%

“…These polymers are cyclodextrin [34], polyaniline (PANI) [35], polythiosemicarbazide (PTSC) [36], polyethyleneimine (PEI)/polyvinyl alcohol (PVA) [37], and polysilsesquioxane (PSQ) [38]. In each case, the polymer has its own usage and advantage for 4-NP reduction.…”

Section: Other Polymer Stabilizersmentioning

confidence: 99%

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Zhao

Feng

Huang

et al. 2015

Coordination Chemistry Reviews

714

510

View full text Add to dashboard Cite

“…[1][2][3][4][5][6] Traditionally, hollow silica spheres are prepared by soft template method, [7][8][9][10][11][12][13] hard template [14][15][16][17][18] method and some other template free methods. [19][20][21][22][23] Most recently, a self-templated method involving an etching process has attracted people's attention for the easy operation without the requirement of an additional template.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hydrophobic hollow silica nanospheres with porous shells and their application in pollutant removal

et al. 2013

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A series of hydrophobic hollow silica nanospheres with high specific surface areas and porous shells were successfully prepared through combination of a one-step reverse-phase microemulsion route and a simple post selective etching method. These materials owned porous shells and high specific surface areas, which were generated in the etching process. The distribution difference of organic groups among the solid nanosphere was innovatively utilized to create a different etching rate between the surface and the inner part of the solid silica nanosphere. After etching, the organic groups are still present on the surface which together with the rough surface give it hydrophobic properties and the contact angles can reach 150u. The reported materials showed good performance in the removal of 4-NP in water.

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“…Several methods have been reported for the synthesis of hollow metal nanostructures, such as galvanic replacement based on the Kirkendall effect, chemical etching, and rigid templating. [3b,4] With a rigid template, a thin shell structure can be easily formed and tuned; however, final removal of the template is challenging . In the Kirkendall method, a shell is formed via chemical reactions based on a self‐template process, by which the template diminishes with the formation of a hollow structure .…”

Section: Introductionmentioning

confidence: 99%

Silver–Copper Hollow Nanoshells as Phase‐Transfer Reagents and Catalysts in the Reduction of 4‐Nitroaniline

Chen

Peng

et al. 2017

Part & Part Syst Charact

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(1 of 7) 1600358 Cysteine-stabilized Ag-Cu hollow nanoshells are prepared by the coreduction of silver nitrate and cupric nitrate with sodium borohydride in the presence of sodium thiocyanate. Transmission electron microscopic measurements show that the resulting Ag-Cu nanoshells exhibit a rather uniform size of 57.2 ± 11.9 nm with a shell thickness of 7.9 ± 1.6 nm, and the hollow volume ratio is estimated to be ≈62%. High-resolution transmission electron microscopic studies show that the nanoshells are composed of nanocrystalline Ag and CuO in segregated domains. Consistent results are obtained in X-ray diffraction measurements. X-ray photoelectron spectroscopic analysis shows that the elemental composition of the nanoshells is consistent with the initial feed ratio of the metal salt precursors. When capped with 1-dodecanethiol, the hollow nanoshells become dispersible in apolar organic solvents and the cavity may be exploited for the effective phase-transfer of target molecules such as rhodamine 6G between water and organic media. The Ag-Cu nanoshells also show apparent catalytic activity toward the reduction of 4-nitroaniline by sodium borohydride, a performance that is markedly better than that of the solid counterparts and comparable to leading results in recent literature based on relevant metal catalysts.of reactions, as compared to their solid counterparts. [3] This is largely ascribed to the high surface area and porous structure of the metal shells that are presumed to facilitate the catalytic reactions and mass transport of reaction species.Several methods have been reported for the synthesis of hollow metal nanostructures, such as galvanic replacement based on the Kirkendall effect, chemical etching, and rigid templating. [3b,4] With a rigid template, a thin shell structure can be easily formed and tuned; however, final removal of the template is challenging. [5] In the Kirkendall method, a shell is formed via chemical reactions based on a self-template process, by which the template diminishes with the formation of a hollow structure. [6] For instance, Kado et al. reported a simple, one-pot synthesis of silver nanoshells based on nanoscale Kirkendall effect by the sequential addition of NaSCN and NaBH 4 into an AgNO 3 solution. [4b] The formation mechanism involved the reduction of hardly soluble AgSCN in the aqueous solution by NaBH 4 . However, the resulting silver nanoshells lacked stability in solution because of ready oxidation when exposed to ambient. This represents a major challenge for further engineering and practical applications.In the present study, by adopting the one-pot synthesis method mentioned above, [4b] we prepared an Ag-Cu hollow nanoshell, which we believe is the first of its kind. The bimetallic nanoshells exhibited a rather uniform spherical structure, and were remarkably stable in solution for months at room temperature, in contrast to the monometallic Ag counterparts. [4b] Interestingly, the nanoscale cavity might be exploited for the encapsulation of selected molecu...

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Controlled synthesis of novel cyanopropyl polysilsesquioxane hollow spheres loaded with highly dispersed Au nanoparticles for catalytic applications

Abstract: The design and synthesis of novel cyanopropyl polysilsesquioxane hollow spheres lead to production of a highly active and stable catalyst in the reduction of 4-nitrophenol catalyzed by Au nanoparticles.

Cited by 96 publications

References 30 publications

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Preparation of hydrophobic hollow silica nanospheres with porous shells and their application in pollutant removal

Silver–Copper Hollow Nanoshells as Phase‐Transfer Reagents and Catalysts in the Reduction of 4‐Nitroaniline

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