Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals,Small

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Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals
Small ( IF 13.0 ) Pub Date : 2018-07-19 , DOI: 10.1002/smll.201801598
Puspanjali Sahu ₁ , Gyanaranjan Prusty ₁ , Amit K Guria ₁ , Narayan Pradhan ₁

Affiliation

For efficient charge separations, multimaterial hetero‐nanostructures are being extensively studied as photocatalysts. While materials with one heterojunction are widely established, the chemistry of formation of multijunction heterostructures is not explored. This needs a more sophisticated approach and modulations. To achieve these, a generic multistep seed mediated growth following controlled ion diffusion and ion exchange is reported which successfully leads to triple‐material hetero‐nanostructures with bimetallic‐binary alloy‐binary/ternary semiconductors arrangements. Ag₂S nanocrystals are used as primary seeds for obtaining AuAg‐AuAgS bimetallic‐binary alloyed metal–semiconductor heterostructures via partial reduction of Ag(I) using Au(III) ions. These are again explored as secondary seeds for obtaining a series of triple‐materials heterostructures, AuAg‐AuAgS‐CdS (or ZnS or AgInS₂), with introduction of different divalent and trivalent ions. Chemistry of each step of the gold ion–induced changes in the rate of diffusion and/or ion exchanges are investigated and the formation mechanism for these nearly monodisperse triple material heterostructures are proposed. Reactions without gold are also performed, and the change in the reaction chemistry and growth mechanism in presence of Au is also discussed.

中文翻译：

调制三材料纳米异质结构：金影响纳米晶体中银的化学活性

为了有效的电荷分离，多材料异质纳米结构作为光催化剂正在被广泛研究。虽然具有一个异质结的材料已被广泛建立，但多结异质结构形成的化学原理尚未探索。这需要更复杂的方法和调制。为了实现这些目标，报道了受控离子扩散和离子交换后的通用多步骤种子介导的生长，成功地产生了具有双金属-二元合金-二元/三元半导体排列的三材料异质纳米结构。 Ag ₂ S纳米晶体被用作主要种子，通过使用Au(III)离子部分还原Ag(I)来获得AuAg-AuAgS双金属-二元合金金属-半导体异质结构。这些再次被探索作为获得一系列三材料异质结构 AuAg-AuAgS-CdS（或 ZnS 或 AgInS ₂ ）的二次种子，并引入不同的二价和三价离子。研究了金离子引起的扩散和/或离子交换速率变化的每个步骤的化学性质，并提出了这些近单分散的三重材料异质结构的形成机制。还进行了不含金的反应，并讨论了金存在下反应化学和生长机制的变化。

更新日期：2018-07-19

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