Giant magnetoresistance in non-magnetic phosphoric acid doped polyaniline silicon nanocomposites with higher magnetic field sensing sensitivity

被引：37

作者：

Gu, Hongbo ^{[1
,2
]}

Guo, Jiang ^{[1
]}

Wei, Huige ^{[1
,3
]}

Huang, Yudong ^{[2
]}

Zhao, Cunyu ^{[4
]}

Li, Ying ^{[4
]}

Wu, Qingliu ^{[5
]}

Haldolaarachchige, Neel ^{[6
]}

Young, David P. ^{[6
]}

Wei, Suying ^{[3
]}

Guo, Zhanhu ^{[1
]}

机构：

[1] Lamar Univ, Dan F Smith Dept Chem Engn, ICL, Beaumont, TX 77710 USA

[2] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150001, Heilongjiang, Peoples R China

[3] Lamar Univ, Dept Chem & Biochem, Beaumont, TX 77710 USA

[4] Univ Wisconsin, Dept Mech Engn, Milwaukee, WI 53211 USA

[5] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

[6] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 26期

基金：

美国国家科学基金会;

关键词：

ELECTRICAL-PROPERTIES; CONJUGATED POLYMERS; CONDUCTING POLYANILINE; OXIDE NANOCOMPOSITES; OPTICAL-PROPERTIES; TRANSPORT; METACOMPOSITES; NANOPARTICLES; POLYPYRROLE; COMPOSITE;

D O I：

10.1039/c3cp50698c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phosphoric acid doped conductive polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with silicon nanopowders have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the nanocomposites are characterized using Fourier transform infrared (FT-IR) spectroscopy. The enhanced thermal stability of the silicon-PANI PNCs compared with pure PANI is obtained using thermogravimetric analysis (TGA). The obtained optical band gap of the PNCs using Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) decreases with increasing silicon loading. The dielectric properties of the PNCs are strongly related to the silicon loading level. Temperature dependent resistivity analysis reveals a quasi 3-D variable range hopping (VRH) electrical conduction mechanism for the synthesized PNCs. Room temperature giant magnetoresistance (GMR) is observed in the synthesized non-magnetic nanocomposites and analyzed using the wave-function shrinkage model.

引用

页码：10866 / 10875

页数：10

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