Dataset Information

Out-of-Substrate Ag-Ag₂O Nanoplates: Surfactantless Photochemical Synthesis, Structural Evolution, and Mechanistic Study.

ABSTRACT: Two types of out-of-substrate Ag-Ag₂O nanoplates were grown on a ZnO substrate through a surfactantless photochemical method. First, the in situ photochemically synthesized Ag-Ag₂O nanoparticles further crystallized into nanoplate-like superstructures with rough surfaces and ragged edges. The nanoparticle-mediated crystallization process was governed by a layer-by-layer crystallization mechanism. Our study should help fundamentally understand the formation mechanism of hierarchical nanoparticle superstructures. Under continuous UV illumination, the hundreds of nanometer-sized rough nanoplates (i.e., the nanoplate-like superstructures of nanoparticles) can be transformed into large smooth nanoplates with sizes of up to several micrometers. The out-of-substrate Ag-Ag₂O nanoplates/ZnO heterostructures are potentially promising for photocatalytic applications.

SUBMITTER: Li MY

PROVIDER: S-EPMC6641424 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Out-of-Substrate Ag-Ag2O Nanoplates: Surfactantless Photochemical Synthesis, Structural Evolution, and Mechanistic Study.

Li Meng Yin MY Mao Yao Quan YQ Yang Su Ke SK Dai Ting Ting TT Yang Hua H Feng Feng F Wu Tao T Chen Muzi M Xu Guo Qin GQ Wu Ji Hong JH

ACS omega 20161027 4

Two types of out-of-substrate Ag-Ag2O nanoplates were grown on a ZnO substrate through a surfactantless photochemical method. First, the in situ photochemically synthesized Ag-Ag2O nanoparticles further crystallized into nanoplate-like superstructures with rough surfaces and ragged edges. The nanoparticle-mediated crystallization process was governed by a layer-by-layer crystallization mechanism. Our study should help fundamentally understand the formation mechanism of hier ...[more]

PMID: 31457157

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Project description:The demand for safer design and synthesis of gold nanoparticles (AuNPs) is on the increase with the ultimate goal of producing clean nanomaterials for biological applications. We hereby present a rapid, greener, and photochemical synthesis of gold nanoplates with sizes ranging from 10 to 200 nm using water-soluble quercetin diphosphate (QDP) macromolecules. The synthesis was achieved in water without the use of surfactants, reducing agents, or polymers. The edge length of the triangular nanoplates ranged from 50 to 1200 nm. Furthermore, the reduction of methylene blue was used to investigate the catalytic activity of AuNPs. The catalytic activity of triangular AuNPs was three times higher than that of the spherical AuNPs based on kinetic rate constants (k). The rate constants were 3.44 × 10-2 and 1.11 × 10-2 s-1 for triangular and spherical AuNPs, respectively. The X-ray diffraction data of gold nanoplates synthesized by this method exhibited that the nanocrystals were mainly dominated by (111) facets which are in agreement to the nanoplates synthesized by using thermal and chemical approaches. The calculated relative diffraction peak intensity of (200), (220), and (311) in comparison with (111) was found to be 0.35, 0.17, and 0.15, respectively, which were lower than the corresponding standard values (JCPDS 04-0784). For example, (200)/(111) = 0.35 compared to 0.52 obtained from the standard (JCPDS 04-0784), indicating that the gold nanoplates are dominated by (111) facets. The calculated lattice from selected area electron diffraction data of the as-synthesized and after 1 year nanoplates was 4.060 and 4.088 Å, respectively. Our calculations were found to be in agreement with 4.078 Å for face-centered cubic gold (JCPDS 04-0784) and literature values of 4.07 Å. The computed QDP-Au complex demonstrated that the reduction process took place in the B ring of QDP. This approach contributes immensely to promoting the ideals of sustainable nanotechnology by eradicating the use of hazardous and toxic organic solvents.

Dataset Information

Out-of-Substrate Ag-Ag₂O Nanoplates: Surfactantless Photochemical Synthesis, Structural Evolution, and Mechanistic Study.

Publications

Out-of-Substrate Ag-Ag<sub>2</sub>O Nanoplates: Surfactantless Photochemical Synthesis, Structural Evolution, and Mechanistic Study.

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