期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 11, 页码 8567-8574出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501380d
关键词
titanate; nanosheets; Langmuir-Blodgett deposition; exfoliation; tetraalkylammonium
资金
- Chemical Sciences division of The Netherlands Organization for Scientific Research (NWO-CW)
- China Scholarships Council (CSC) [2011704003]
The exfoliation and deposition of large (10-100 mu m) Ti0.87O2 and small (0.1-1 mu m) Ti0.91O2 nanosheets from lepidocrocite-type protonated titanates was investigated for getting high quality films. Exfoliation was carried out with different tetra-alkyl ammonium ions (TAA(+)) and varying TAA(+)/H+ ratios, and the colloidal solutions were characterized by small-angle X-ray scattering (SAXS) and ultraviolet-visible (UV-vis) spectroscopy. Using Langmuir-Blodgett deposition the titanate nanosheets were directly transferred onto a Si substrate. The resulting films were characterized by atomic force microscopy (AFM). The results indicate that the H1.07Ti1.73O4 titanate exfoliated at very low ratios of TAA(+)/H+; no lower threshold for exfoliation was observed for the TAA(+) concentration. Nanosheets exfoliated at very low ratios of TAA(+)/H+ typically showed a small size and porous surface. Subsequent exfoliation of the remaining layered titanate particles yielded much higher quality nanosheets. The optimized deposition parameters for Langmuir-Blodgett films suggest that the surface pressure is a key parameter to control the coverage of the film. The bulk concentration of nanosheets was found to be a less important deposition parameter in the LB deposition process. It only influenced whether the desired surface pressure could be reached at a given maximum degree of compression.
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