Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 3, Pages 4043-4050Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20716
Keywords
core-shell nanoparticles; ZnIn2S4 shells; silica cores; photocatalytic hydrogen evolution
Funding
- Ministry of Science and Technology of Taiwan [MOST 108-2221-E-008-04-MY3, MOST 104-2628-E-008-003-MY3]
- US Air Force Office of Scientific Research [FA238617-1-4028, FA9550-20-1-0349, 20RT0302]
- Robert A. Welch Foundation [E-1320]
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By adding acid in ethanol, the crystallinity of SiO2@ZIS core-shell nanoparticles can be improved, and the thickness of the ZIS shell can be controlled by adjusting the amount of acid and the concentration of the ZIS precursor.
The coverage, thickness, and crystallinity of ZnIn2S4 (ZIS) shells on SiO2 core nanoparticles (SiO2@ZIS) were systematically investigated using microwave-assisted solvothermal methods aided by the addition of acid in ethanolic medium. The surface modification of the SiO2 cores with (3-mercaptopropyl)-trimethoxysilane was found to be critical to generate a homogeneous coverage of ZnIn2S4. The siO(2)@ZIS core-shell nanoparticles exhibited the best coverage but poor crystallinity when synthesized in pure ethanol, whereas best crystallinity but poor coverage was observed when synthesized in an aqueous solution. The addition of selected amounts of acid (HCl) led to improved crystallinity in the ethanolic medium. The thickness of the ZIS shell could be controlled in an ethanolic solution by judiciously varying the amounts of acid and the concentration of the ZIS precursor. Increasing the concentration of the ZIS precursor to twice the standard concentration in ethanolic solution with the addition of 100 mu L of HCl afforded better crystallinity, homogeneous coverage, and optimal photocatalytic hydrogen production.
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