Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research
5 years ago

Preparation of In(OH)3 and In2O3 Nanorods through a Novel Hydrothermal Method and the Effect of Sn Dopant on Crystal Structures

Preparation of In(OH)3 and In2O3 Nanorods through a Novel Hydrothermal Method and the Effect of Sn Dopant on Crystal Structures
Yujun Wang, Fan Zhang, Guangsheng Luo, Jingchuo Wang
Indium hydroxide (In(OH)3) nanorods and Sn-doped indium oxyhydroxide (InOOH) nanoparticles were synthesized through the hydrothermal method in an aqueous solution. Sodium hydroxide (NaOH) was introduced to adjust the pH value, and sodium acetate (CH3COONa) was employed as the inducer to accelerate the growth along the preferential orientation. Cubic In(OH)3 was synthesized at pH values ranging from 4.0 to 8.0. In(OH)3 nuclei grows in the direction {100} into nanorods observed from lattice fringes with an interplanar spacing of about 0.403 nm. The SAED pattern of In(OH)3 nanorods indicates the rodlike nanocrystal is a single crystal which matches well with the characteristic peaks of cubic In(OH)3 XRD patterns. The FTIR spectrum signifies the absorption of CH3COO– onto the surface of In(OH)3 nanorods, which accelerate the growth along the direction {100}. Due to the inhibition effect of OH–, In(OH)3 particles with a smaller aspect ratio and In2O3 particles with a smaller crystal size were synthesized with the increase of pH values. At a high hydrothermal temperature, cubic In(OH)3 transformed into orthorhombic InOOH owing to the dopant of Sn with a size smaller than In3+ and r(Sn4+)/r(O2–) = 0.58. The lattice fringes and SAED patterns of InOOH and hexagonal In2O3 nanoparticles were determined. It was also observed that the average size increased from 27 to 46 nm when Sn doping content increased from 2% to 10%. The sensors based on the Sn-doped In2O3 nanoparticles showed a fast (6–7 s) and high response (Ra/Rg = 8.9) to 100 ppm acetone at an operating temperature of 280 °C. This work provides a preliminary investigation into the effect of sodium acetate and Sn on the growth of In(OH)3 nuclei.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b05085

DOI: 10.1021/acs.iecr.7b05085

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