Journal
ACS NANO
Volume 7, Issue 10, Pages 8932-8939Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn403428m
Keywords
two-dimensional nanosheet; vanadium doping; ferroelectricity; piezoelectric nanogenerator; energy harvesting; direct current
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Funding
- National Research Foundation (NRF) of Korea
- Ministry of Science
- ICT
- Future Planning [2012R1A2A1A01002787, 2010-0019086, 2009-0083540]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy (MKE) [2011-8520010050]
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Here, we report the synthesis of lead-free single-crystalline two-dimensional (2D) vanadium(V)-doped Zn0 nanosheets (NSs) and their application for high-performance flexible direct current (DC) power piezoelectric nanogenerators (NGs). The vertically aligned Zn0 nanorods (NRs) converted to NS networks by V doping. Piezoresponse force microscopy studies reveal that vertical V-doped Zn0 NS exhibit typical ferroelectricity with clear phase loops, butterfly, and well-defined hysteresis loops with a piezoelectric charge coefficient of up to 4 pm/V, even in 2D nanostructures. From pristine In NR-based NGs, alternating current (AC)-type output current was observed, while from V-doped Zn0 NS-based NGs, a DC-type output current density of up to 1.0 mu Acm(-2) was surprisingly obtained under the same vertical compressive force. The growth mechanism, ferroelectric behavior, charge inverted phenomena, and high piezoelectric output performance observed from the V-doped Zn0 NS are discussed in terms of the formation of an ionic layer of [V(0H)(4)(-)], permanent electric dipole, and the doping-induced resistive behavior of Zn0 NS.
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