Direct Printing of Micropatterned Plasmonic Au Nanoparticle/MoS(2) Heterostructure for Ultrasensitive Surface-Enhanced Raman Spectroscopy Sensing #MMPMID41319198
Xie H; Zhang Y; Bai Y; Li H; Lei D; Huang H; Zhang AP
Small Methods 2025[Nov]; ? (?): e01968 PMID41319198show ga
Molybdenum disulfide (MoS(2)) has attracted a wide range of research attention due to its distinct electronic structures and the great potential for use in emerging microelectronic and photonic devices. However, the development of MoS(2)-based micro-electronic/photonic devices lags far behind expectations mainly because of the lack of efficient microfabrication technology. Here, a high-resolution precision photoreduction technology is presented for directly printing MoS(2) micropatterns that can be decorated into gold nanoparticle (AuNP)/ MoS(2) heterostructure for ultrasensitive surface-enhanced Raman spectroscopy (SERS) sensing. Micropatterns of MoS(x) nanoparticles are initially grown toward a target size in a light-controlled manner and then transformed into a micropatterned pure MoS(2) nanofilm through thermal annealing. Thereafter, size and gap-controlled AuNPs are grown selectively on the surface of MoS(2) to form a self-aligned AuNP/MoS(2) heterostructure with desired optical properties. Thanks to both electromagnetic and chemical enhancements, the directly printed plasmonic AuNP/ MoS(2) substrate can greatly enhance Raman signals to detect crystal violet (CV) and 4-mercaptobenzoic acid (4-MBA) at 10(-12) m under the excitation of 785-nm laser. This multiscale-engineered plasmonic AuNP/MoS(2) substrate is rapidly printed without relying on expensive and time-consuming nanofabrication processes, offering a new technical approach for future development of MoS(2)-based micro-devices and sensing platforms.
Small+Methods 2025 ; ? (?): e01968
