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Aqueous electrosynthesis of silver indium selenide nanocrystals and their photothermal properties
Green Chemistry ( IF 9.3 ) Pub Date : 2020/01/08 , DOI: 10.1039/c9gc03647d Felipe L. N. Sousa 1, 2, 3, 4, 5 , Brenand A. S. Souza 1, 2, 3, 4, 5 , Anderson C. Jesus 5, 6, 7, 8 , Walter M. Azevedo 1, 2, 3, 4, 5 , Herman S. Mansur 5, 6, 7, 8 , Denilson V. Freitas 1, 2, 3, 4, 5 , Marcelo Navarro 1, 2, 3, 4, 5
Green Chemistry ( IF 9.3 ) Pub Date : 2020/01/08 , DOI: 10.1039/c9gc03647d Felipe L. N. Sousa 1, 2, 3, 4, 5 , Brenand A. S. Souza 1, 2, 3, 4, 5 , Anderson C. Jesus 5, 6, 7, 8 , Walter M. Azevedo 1, 2, 3, 4, 5 , Herman S. Mansur 5, 6, 7, 8 , Denilson V. Freitas 1, 2, 3, 4, 5 , Marcelo Navarro 1, 2, 3, 4, 5
Affiliation
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The eco-friendly aqueous electrosynthesis of AgIn5Se8 (AISe) nanocrystals (NCs), and their respective core/shell structure AgIn5Se8/ZnS NCs (AISe/ZnS), was carried out by using L-glutathione (GSH) as a stabilizer. Se0 direct reduction was carried out in a graphite powder macroelectrode of an electrochemical cavity cell, controlled by current (i = 30 mA) and electric charge (Q = 11.6 C). The generated Se2− ions react with In3+ and Ag+ ions in the intermediate compartment of the cell to give AISe NCs. A paired electrolysis (Zn0 anode/S0 in a graphite powder cathode) was carried out to prepare ZnS-GSH NCs, using the same electrochemical apparatus (i = 30 mA and Q = 9.6 C). The effects of the Ag+/In3+ ratio (0.5, 0.28 and 0.18) and ZnS shell on the optical properties of AISe NCs were investigated. The ternary AISe NCs were characterized by XRD and HRTEM, which revealed that AgIn5Se8 had a cubic phase structure (Ag+/In3+ = 0.18) and the ZnS shell had a zinc blende structure. The shell growth promoted a heterojunction formation with different crystalline phases, leading to a quantum yield decrease (QY: AISe = 18.6%; AISe/ZnS = 16.0%). The NCs were irradiated with a near-infrared laser at different power densities (λexc = 785 nm). AISe and AISe/ZnS samples showed photothermal response, reaching 381 K and 402 K, respectively.
中文翻译：
硒化银铟纳米晶体的水电合成及其光热性能
AgIn 5 Se 8（AISe）纳米晶体（NCs）及其各自的核/壳结构AgIn 5 Se 8 / ZnS NCs（AISe / ZnS）的环保水电合成是通过使用L-谷胱甘肽（GSH）进行的作为稳定剂。在电流（i = 30 mA）和电荷（Q = 11.6 C）的控制下，在电化学空腔电池的石墨粉末大电极中进行Se 0直接还原。产生的Se 2-离子与电解池中间隔室中的In 3+和Ag +离子反应，生成AISe NCs。一对电解（Zn 0使用相同的电化学装置（i = 30 mA，Q = 9.6 C）进行阳极氧化/石墨粉阴极中的S 0制备ZnS-GSH NCs 。研究了Ag + / In 3+比率（0.5、0.28和0.18）和ZnS壳层对AISe NCs光学性能的影响。通过XRD和HRTEM对AISe三元NC进行表征，表明AgIn 5 Se 8具有立方相结构（Ag + / In 3+＝ 0.18），并且ZnS壳具有锌混合结构。壳层的生长促进了具有不同晶相的异质结的形成，导致量子产率的下降（QY：AISe = 18.6％； AISe / ZnS = 16.0％）。的NC物在不同的功率密度与近红外激光辐射的（λ EXC = 785纳米）。AISe和AISe / ZnS样品显示出光热响应，分别达到381 K和402K。
更新日期：2020-02-24
中文翻译：
硒化银铟纳米晶体的水电合成及其光热性能
AgIn 5 Se 8（AISe）纳米晶体（NCs）及其各自的核/壳结构AgIn 5 Se 8 / ZnS NCs（AISe / ZnS）的环保水电合成是通过使用L-谷胱甘肽（GSH）进行的作为稳定剂。在电流（i = 30 mA）和电荷（Q = 11.6 C）的控制下，在电化学空腔电池的石墨粉末大电极中进行Se 0直接还原。产生的Se 2-离子与电解池中间隔室中的In 3+和Ag +离子反应，生成AISe NCs。一对电解（Zn 0使用相同的电化学装置（i = 30 mA，Q = 9.6 C）进行阳极氧化/石墨粉阴极中的S 0制备ZnS-GSH NCs 。研究了Ag + / In 3+比率（0.5、0.28和0.18）和ZnS壳层对AISe NCs光学性能的影响。通过XRD和HRTEM对AISe三元NC进行表征，表明AgIn 5 Se 8具有立方相结构（Ag + / In 3+＝ 0.18），并且ZnS壳具有锌混合结构。壳层的生长促进了具有不同晶相的异质结的形成，导致量子产率的下降（QY：AISe = 18.6％； AISe / ZnS = 16.0％）。的NC物在不同的功率密度与近红外激光辐射的（λ EXC = 785纳米）。AISe和AISe / ZnS样品显示出光热响应，分别达到381 K和402K。
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