Journal
SMALL
Volume 14, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704526
Keywords
first-principles calculations; inorganic layered crystals; metal-semiconductor contact; synchrotron radiation
Categories
Funding
- Strategic Grant of University of Oulu
- Natural Science Foundation of Shanghai [12ZR1407000]
- European Regional Development Funding
- China Scholarship Council
- Swiss National Science Foundation [200020_146739]
- European Commission's Seventh Framework Programme (FP7/2007-2013) CALIPSO [312284]
- Academy of Finland
- National Natural Science Foundation of China [11204079]
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A critical factor for electronics based on inorganic layered crystals stems from the electrical contact mode between the semiconducting crystals and the metal counterparts in the electric circuit. Here, a materials tailoring strategy via nanocomposite decoration is carried out to reach metallic contact between MoS2 matrix and transition metal nanoparticles. Nickel nanoparticles (NiNPs) are successfully joined to the sides of a layered MoS2 crystal through gold nanobuffers, forming semiconducting and magnetic NiNPs@MoS2 complexes. The intrinsic semiconducting property of MoS2 remains unchanged, and it can be lowered to only few layers. Chemical bonding of the Ni to the MoS2 host is verified by synchrotron radiation based photoemission electron microscopy, and further proved by first-principles calculations. Following the system's band alignment, new electron migration channels between metal and the semiconducting side contribute to the metallic contact mechanism, while semiconductor-metal heterojunctions enhance the photocatalytic ability.
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