Preparations of Nano/Micro Structured Polyaniline Membranes for pH Sensing

Abstract

Abstract: Effect of acidity on the growth of polyaniline nanostructures was investigated in various acidic media, such as 0.1 mol/L H₂SO₄, phosphate buffer solutions(PBS) at pH=4 and pH=7, and 0.1 mol/L ammonium hydroxide. PANI nanostructures, such as nanocactus, micromats, microflakes, microroses and interconnected three-dimensional networks, microdendrimers, microbranches, etc., were synthesized using ammonium persulfate as oxidant under frozen condition in solution and on dipped substrates, respectively. A possible mechanism for forming those PANI nanostructures, ascribed to pH effect and the crystalline anisotropy of ice to direct growth, was proposed. In addition, induction of dipped substrates and diffusion-limited growth play key roles in forming dendritic morphology on them. Moreover, pH responses of those four nanostructured PANI membranes in-situ deposited on glass substrates were further examined in the range of pH=3—9, which resulted in a high sensitivity.

Key words: Polyaniline, Nano/micro structures, Acidity, In-situ deposition, pH sensing

TrendMD:

SONG Ji-Xia, HAN Dong-Xue*, LI Fei, NIU Li. Preparations of Nano/Micro Structured Polyaniline Membranes for pH Sensing[J]. Chem. J. Chinese Universities, 2010, 31(8): 1688.

References

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