Symmetry Breaking Induced by Growth Kinetics: One‐Pot Synthesis of Janus Au−AgBr Nanoparticles,ChemNanoMat

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Symmetry Breaking Induced by Growth Kinetics: One‐Pot Synthesis of Janus Au−AgBr Nanoparticles
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-09-09 , DOI: 10.1002/cnma.202000438
Reki Takahashi ₁ , Musashi Fujishima ₁ , Hiroaki Tada ₁ , Tetsuro Soejima ₁

Affiliation

This study describes a one‐pot synthetic strategy consisting of concerted stabilization and photo and chemical reductions of metal ions to yield precise anisotropic nanostructures. Photoirradiation of an aqueous precursor solution containing Au³⁺, Ag⁺, Br⁻, and polyvinylpyrrolidone (PVP) forms Janus nanoparticles (NPs) composed of Au having a tiny Ag shell and AgBr. The Au NPs are initially generated by photoreduction of Au³⁺ in the precursor solution, in which the formation of silver halides is strongly inhibited by the coordination bond between Ag⁺ and the carbonyl groups in PVP. The coordinated PVP chains are adsorbed on the surfaces of the Au NPs, with the concomitant release of free Ag⁺ ions. The part of the surface of the Au NP is covered with a few Ag atoms via chemical reduction of Ag⁺ by PVP. AgBr nanocrystals grow at a bare site on the surface of each Au NP, resulting in the formation of nearly monodisperse Janus Au−AgBr NPs in high yield. A characteristic light absorption profile emerges due to the interface formed between Au and AgBr, which is demonstrated by finite‐difference time‐domain simulation. The precise nanostructures may be leveraged to elucidate mechanisms of photoelectrochemical processes and to construct advanced plasmonic photocatalysts.

中文翻译：

生长动力学引起的对称性破坏：Janus Au-AgBr纳米粒子的一锅法合成

这项研究描述了一种单罐合成策略，该策略包括协同稳定化以及金属离子的光化学还原以产生精确的各向异性纳米结构。含Au的前体水溶液的光照射³⁺，银⁺，溴^-，和聚乙烯吡咯烷酮（PVP）形成由Au构成的Janus纳米颗粒（NP），其具有一个微小的Ag壳和溴化银。Au NPs最初是通过前体溶液中Au ³⁺的光还原生成的，其中Ag ⁺和PVP中羰基之间的配位键强烈抑制了卤化银的形成。配位的PVP链吸附在Au NPs的表面上，同时释放出游离的Ag ⁺离子。通过PVP对Ag ⁺的化学还原，Au NP的表面部分覆盖了几个Ag原子。AgBr纳米晶体在每个Au NP表面的裸露位置生长，从而以高产率形成几乎单分散的Janus Au-AgBr NP。由于金和银溴之间形成了界面，因此出现了特征性的光吸收曲线，这在时域有限差分模拟中得到了证明。可以利用精确的纳米结构阐明光电化学过程的机理并构建先进的等离激元光催化剂。

更新日期：2020-10-13

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