講演情報
[16a-S4_202-1]River Sand-Derived SiO2 Nanoparticles Decorated Few-Layer MoS2 Films for Visible-Light-Driven Photocatalysis
〇(PC)Abdul A Kuddus1, Koshiro Kawakami1, Sakib Ahmed2, Suman Islam2, Abu Bakar Md Ismail2, Shinichiro Mouri1 (1.Ritsumeikan Univ., 2.Univ. of Rajshahi)
キーワード：
SiO2 Nanoparticles、MoS2、Photocatalysis
The integration of nanoparticles with two-dimensional (2D) materials provides an effective strategy to enhance optoelectronic performance by increasing interfacial areas and improving charge dynamics [1,2]. Here, we report a sustainable hybrid system based on few-layer chemical vapor deposit (CVD)-grown MoS2 films decorated with eco-sourced silica nanoparticles (SiO2 NPs) extracted from natural river sand. The SiO2 NPs were synthesized via a microwave-assisted alkali-fusion process at a low temperature of 250 °C using a simplified chemical route, offering an environmentally benign and scalable approach. The nanoparticles were subsequently dispersed on sapphire substrates by spin coating and used as a growth platform for few-layer MoS2 films deposited by CVD at 750 °C. Optical and scanning electron microscopy demonstrate a moderate uniform distribution of SiO2 nanoparticles with sizes ranging from a few nanometers to several hundred nanometers. Raman mapping and spectra further reveal the presence of SiO2 NPs and confirm the structural integrity of 4–5-layer 2H-MoS2 films. Optical absorption observations reveal enhanced light absorption for MoS2 grown on SiO2 NP-dispersed substrates compared with pristine films, while higher SiO2 NP density further amplifies the absorption response before reaching saturation beyond 3 cycle spin coats. This enhancement is attributed to improved surface passivation, suppression of trap-assisted recombination, and promoted interfacial charge transfer in the MoS2/SiO2 hybrid system, highlighting the strong potential for visible-light-driven photocatalytic applications.