Tuning surface morphology of AuNPs film via thiourea as a stable SERS platform for methylene blue
作者：Minqiang Xia, Lingui Hu, Yulu Ye, Yunbo Li
關鍵字：Gold nanoparticles AuNPs film Thiourea SERS Electronic conduction
論文來源：期刊
具體來源：Talanta Volume 281, 1 January 2025, 126848
發表時間：2024年
Gold nanoparticles (AuNPs) have been extensively utilized in various
fields such as sensors, life sciences, and catalysis. In this study,
AuNPs were synthesized using a reduction method and subsequently treated
with thiourea in an ethanol-water environment to prepare AuNPs film
using a centrifugal deposition method for first time, resulting in the
aggregation of the initial small-sized AuNPs into larger
microsphere-like structures. The addition of thiourea facilitated the
interconnection between AuNPs, ultimately leading to the formation of
large stable gold microspheres. The sheet resistance of the AuNP films
transitioned from being non-conductive to exhibiting a sheet resistance
of 42.6 Ω/sq following thiourea treatment. The transformation from a
flat surface to tightly connected particles resembling microspheres was
observed from SEM images. The thiourea treatment not only altered the
morphological characteristic of the AuNPs films but also significantly
increased the number of scattering sites on their surface, leading to a
substantial enhancement in the Raman scattering effect for methylene
blue. This structural configuration also improved the electronic
conduction and stability of the treated AuNPs films. Consequently, these
findings suggest that AuNPs have promising application prospects in
surface-enhanced Raman scatting (SERS), as well as in flexible
electronics, catalysis, adsorption, and energy fields.