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A macrocycle-assisted nanoparticlization process for bulk Ag2S.

A new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches is reported. We report herein a new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches.... Full description

Journal Title: Chemical science January 1, 2015, Vol.6(1), pp.654-658
Main Author: He, Xin
Other Authors: Wang, Yuechao , Gao, Cai-Yan , Jiang, Hong , Zhao, Liang
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 2041-6520 ; DOI: 10.1039/c4sc01884b
Link: http://search.proquest.com/docview/1920200541/?pq-origsite=primo
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recordid: proquest1920200541
title: A macrocycle-assisted nanoparticlization process for bulk Ag2S.
format: Article
creator:
  • He, Xin
  • Wang, Yuechao
  • Gao, Cai-Yan
  • Jiang, Hong
  • Zhao, Liang
subjects:
  • Chemistry
ispartof: Chemical science, January 1, 2015, Vol.6(1), pp.654-658
description: A new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches is reported. We report herein a new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches. Bulk Ag 2 S was dissolved in solution with the assistance of a macrocyclic ligand, hexamethylazacalix[6]pyridine ( Py[6] ), to produce polynuclear silver sulfide cluster aggregates. All Ag–S cluster aggregates obtained in three crystalline complexes were protected by Py[6] macrocycles. Removing the protective Py[6] macrocycles by protonation led to the generation of unconventional Ag–S nanoparticles with a large energy gap. Theoretical calculations by a hybrid DFT method demonstrated that the silver sulfide clusters with high Ag/S ratio exhibited more localized HOMO–LUMO orbitals, which consequently enlarged their band gap energies. These experimental and theoretical studies broaden our understanding of the fabrication of nanomaterials by virtue of the advantages of both bottom-up and top-down methods and meanwhile provide a viable means of adjusting the band gap of binary nanomaterials independent of their size.
language: eng
source:
identifier: ISSN: 2041-6520 ; DOI: 10.1039/c4sc01884b
fulltext: fulltext
issn:
  • 20416520
  • 2041-6520
url: Link


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titleA macrocycle-assisted nanoparticlization process for bulk Ag2S.
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descriptionA new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches is reported. We report herein a new nanoparticlization process for the bulk-to-nano transformation of Ag 2 S by incorporating both top-down and bottom-up approaches. Bulk Ag 2 S was dissolved in solution with the assistance of a macrocyclic ligand, hexamethylazacalix[6]pyridine ( Py[6] ), to produce polynuclear silver sulfide cluster aggregates. All Ag–S cluster aggregates obtained in three crystalline complexes were protected by Py[6] macrocycles. Removing the protective Py[6] macrocycles by protonation led to the generation of unconventional Ag–S nanoparticles with a large energy gap. Theoretical calculations by a hybrid DFT method demonstrated that the silver sulfide clusters with high Ag/S ratio exhibited more localized HOMO–LUMO orbitals, which consequently enlarged their band gap energies. These experimental and theoretical studies broaden our understanding of the fabrication of nanomaterials by virtue of the advantages of both bottom-up and top-down methods and meanwhile provide a viable means of adjusting the band gap of binary nanomaterials independent of their size.
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