期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 49, 页码 27473-27478出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09456
关键词
layered perovskite-type niobate; molten salt synthesis; flux synthesis; protonation; exfoliation; monolayer nanosheets; PZT thin films; piezoelectric properties
资金
- Chemical Sciences division of The Netherlands Organization for Scientific Research (NWO-CW)
- China Scholarship Council (CSC) [2011704003]
The layered perovskite-type niobate KCa2Nb3O10 and its derivatives show advantages in several fields, such as templated film growth and (photo)catalysis. Conventional synthesis routes generally yield crystal size smaller than 2 mu m. We report a flux synthesis method to obtain KCa2Nb3O10 crystals with significantly larger sizes. By using different flux materials (K2SO4 and K2MoO4), crystals with average sizes of 8 and 20 mu m, respectively, were obtained. The KCa2Nb3O10 crystals from K2SO4 and K2MoO4 assisted synthesis were protonated and exfoliated into monolayer nanosheets, and the optimal exfoliation conditions were determined. Using pulsed laser deposition, highly (001)-oriented piezoelectric stacks (SrRuO3/PbZr0.52Ti0.48O3/SrRuO3, SRO/PZT/SRO) were deposited onto Langmuir-Blodgett films of Ca2Nb3O10- (CNO) nanosheets with varying lateral nanosheet sizes on Si substrates. The resulting PZT thin films showed high crystallinity irrespective of nanosheet size. The small sized nanosheets yielded a high longitudinal piezoelectric coefficient d(33) of 100 pm/V, while the larger sized sheets had a d(33) of 72 pm/V. An enhanced transverse piezoelectric coefficient d(31) of -107 pm/V, an important input parameter for the actuation of active structures in microelectromechanical systems (MEMS) devices, was obtained for PZT films grown on CNO nanosheets with large lateral size, while the corresponding value on small sized sheets was -96 pm/V.
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