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Morphology‐Controllable Synthesis of Cubic‐Structured In 2 O 3 Particles with Enhanced NO 2 Gas Sensitivity
Author(s) -
Lu Bin,
Chen Pen,
Zou Jie,
Yao Bin,
Chen Hongbing
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800401
Subject(s) - oxide , materials science , solvent , chemical engineering , precipitation , hydrolysis , volume fraction , particle size , inorganic chemistry , particle (ecology) , chemistry , organic chemistry , composite material , physics , oceanography , meteorology , engineering , metallurgy , geology
A hydrated basic sulfate precursor for In 2 O 3 is facilely prepared from the mixed indium nitrate and ammonium sulfate solutions via means of single‐step hydrolysis precipitation at a relatively low synthetic temperature of ≈60 °C, which subsequently converts to an oxide powder via pyrolyzing. The morphologies of the precursor and oxide can be controlled via adjusting volume fractions of ethanol‐water solvents. The pure water solvent in the reaction system leads to a thick two‐dimension plate‐like precursor and its oxide generally retains the original shape, while the addition of ethanol up to the volume fraction of 75% in the mother liquor is able to effectively reduce the thickness of the plates to result in well‐dispersed oxide powder with round morphology via partial split, full collapse, and particle growth processes. The as‐prepared In 2 O 3 gas sensors have rapid response and recovery time to trace NO 2 and the In 2 O 3 gas sensor derived from the well‐dispersed oxide powder has a rather higher sensitivity than the agglomerated one.