Shape-Controllable Gold Nanoparticle-MoS2Hybrids Prepared by Tuning Edge-Active Sites and Surface Structures of MoS2via Temporally Shaped Femtosecond Pulses.
Edge-active site control of MoS2is crucial for applications such as chemical catalysis, synthesis of functional composites, and biochemical sensing. This work presents a novel nonthermal method to simultaneously tune surface chemical (edge-active sites) and physical (surface periodic micro/nano structures) properties of MoS2using temporally shaped femtosecond pulses, through which shape-controlled gold nanoparticles are in situ and self-assembly grown on MoS2surfaces to form Au-MoS2hybrids. The edge-active sites with unbound sulfurs of laser-treated MoS2drive the reduction of gold nanoparticles, while the surface periodic structures of laser-treated MoS2assist the shape-controllable growth of gold nanoparticles. The proposed novel method highlights the broad application potential of MoS2; for example, these Au-MoS2hybrids exhibit tunable and highly sensitive SERS activity with an enhancement factor up to 1.2 × 107, indicating the marked potential of MoS2in future chemical and biological sensing applications.
Pei
P
Zuo
Lan
http://orcid.org/0000-0003-0488-1987
L
Jiang
Xin
X
Li
Bo
B
Li
Yongda
Y
Xu
Xuesong
X
Shi
Peng
P
Ran
State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, P. R. China.
Tianbao
T
Ma
Department of Electrical and Computer Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0511, United States.
Dawei
D
Li
Liangti
L
Qu
Department of Electrical and Computer Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0511, United States.
Yongfeng
Y
Lu
Laser Thermal Lab, Department of Mechanical Engineering, University of California, Berkeley Berkeley, California 94720, United States.
Costas P
CP
Grigoropoulos
Au−MoS2 hybrids; MoS2 film; edge-active site; periodic surface structure; shaped femtosecond pulse