Ag-Ga 双金属纳米结构由银-液态镓核-壳系统超声制备，用于催化应用,ACS Applied Nano Materials

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Ag-Ga 双金属纳米结构由银-液态镓核-壳系统超声制备，用于催化应用
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-04-29 , DOI: 10.1021/acsanm.2c00802
Claudia A. Echeverria ₁ , Junma Tang ₁ , Zhenbang Cao ₁ , Dorna Esrafilzadeh ₂ , Kourosh Kalantar-Zadeh ₁

Affiliation

银 (Ag) 纳米合金在多种工业应用中发挥着重要作用。虽然仍然可以探索许多可持续的框架来进行合成和功能结合，但纳米级的相和结构的控制仍然是其实际实施的主要挑战。在本研究中，液相镓 (Ga _(L)）纳米/微球被用于此目的，研究它们作为反应介质和金属合金元素的功能，用于从氟化银前体开发一维（1D）Ag-Ga纳米合金。绿色合成方法选择接近室温的超声波输入。综合分析了超声振荡下成核、各向异性生长和形态发展的机制。实验结果表明，一维 Ag-Ga 纳米合金的发展与超声暴露时间相关，影响粒子间/粒子内相互作用，调节 Ga _(L)纳米/微球尺寸和结构特性，并据此建立Ag-Ga双金属核壳微系统。观察到随后的自组装机制主要由 Ga _(L)表面张力和促进自发 Ag-Ga 液-固界面润湿和金属间化合物扩散的分子间力驱动。一维纳米合金的成核和结晶遵循两种可能的途径，以区分纳米针或纳米棒形式的形态，确定为 Ag ₂ Ga 晶相。我们观察到 Ga _{(L)的关键优势}纳米/微球作为反应介质是一维 Ag-Ga 批量结构的相和形态发展的直接控制，展示了用于催化应用的工程纳米合金绿色合成的直接途径。

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Ag–Ga Bimetallic Nanostructures Ultrasonically Prepared from Silver–Liquid Gallium Core–Shell Systems Engineered for Catalytic Applications

Silver (Ag) nanoalloys play significant roles in several industrial applications. While still many sustainable frameworks can be explored for the synthesis and functional incorporations, the control of phase and structure at the nanoscale still is a major challenge for their practical implementation. In this study, liquid-phase gallium (Ga_(L)) nano-/microspheres were utilized for this purpose, investigating their function as reaction media and metallic alloying elements for the development of one-dimensional (1D) Ag–Ga nanoalloys from a silver fluoride precursor. Ultrasonic input at near room temperature was selected for the green synthesis method. The mechanisms for the nucleation, anisotropic growth, and morphological development under ultrasonic oscillations were comprehensively analyzed. The experimental outcomes revealed that the development of 1D Ag–Ga nanoalloys was in correlation with the ultrasonic exposure time, influencing the inter-/intraparticle interactions, modulating the Ga_(L) nano-/microsphere dimensional and structural properties, and establishing Ag–Ga bimetallic core–shell microsystems accordingly. The subsequent self-assembly mechanisms were observed to have been primarily driven by Ga_(L) surface tension and intermolecular forces promoting spontaneous Ag–Ga liquid–solid interfacial wetting and intermetallic diffusion. The nucleation and crystallization of the 1D nanoalloys developed following two possible pathways for the differentiation of morphologies in the form of either nanoneedles or nanorods identified as the Ag₂Ga crystal phase. We observed that the key advantage of Ga_(L) nano-/microspheres as the reaction media is the direct control of the phase and morphological development of the 1D Ag–Ga batch structures, demonstrating a straightforward route for the green synthesis of engineered nanoalloys for catalytic applications.

更新日期：2022-04-29

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