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NUANCE scientists' modified technique published in ACS Nano

September 21, 2017 - Until recently, transition metal dichalcogenides were mostly grown on flat substrate and their reliable encapsulation on spherical nanoparticles remains a challenge. But in a recent discovery at NUANCE by Dr. Yuan Li, Dr. Xinqi Chen, and Prof. Vinayak Dravid, Superior Plasmonic Photodetectors Based on Au@MoS2 published last September in ACS Nano, scientists developed a modified chemical vapor deposition technique to realize the direct encapsulation of few-layer MoS2 shell on Au nanoparticles.

Integrating plasmonic materials into semiconductor media provides a promising approach for applications such as photosensing and solar energy conversion. The resulting structure introduces enhanced light-matter interaction, additional charge trap state, and efficient charge-transfer pathway for light-harvesting devices, especially when an intimate interface is built between the plasmonic nanostructure and semiconductor.

The discovery will benefit instrumentation, semiconductor, optoelectronic, and medical diagnosis companies, Chen said.

The improvement of photosensing performance can be a combined result of multiple factors, including enhanced light absorption, creation of more trap states, and, possibly, the formation of interfacial charge-transfer transition, benefiting from the intimate connection of Au and MoS2.

This new technique is highly-reproductive and “feasible to realize large scale industrial production,” said Chen. “Such core-shell hybrids exhibit superior optical, electronic properties such as fast photoresponse and high sensitivity, and excellent photocatalytic activity. It makes them a promising substitute material for future optical imaging, optoelectronic devices, and energy and environmental applications.”

For the first time researchers proposed and realized the synthesis of a novel compact core-shell heterostructure composed of Au nanoparticle core and few-layer MoS2 shell. Commercially, significantly enhanced Raman signals were observed in our heterostructures, which makes them an interesting material for surface-enhanced Raman spectroscopy, medical diagnosis, and bio-imaging, Chen said.