Synthesis, electrical and magnetotransport properties of polypyrrole-MWCNT nanocomposite

Abstract

The present work describes the preparation of nanocomposites in which the multiwall carbon nanotubes (MWCNT) have been mixed with conducting polypyrrole (PPy) via an in situ chemical oxidative preparation method. To reveal their structural, morphological and thermal properties, the composites have been characterized by x-ray diffraction, field emission scanning electron microscope, Fourier transform infrared, thermogravimetric analysis respectively. Electrical transport and magnetotransport properties have been investigated in the temperature range 77-300K in presence as well as in absence of magnetic field up to 1Tesla. The conductivities of the composites are greater than that of pure polypyrrole. All the investigated samples follow Mott's variable range hopping (VRH) theory whereas the magnetic field dependent conductivity have been explained in terms of two opposite but simultaneously acting hopping effect-wave function shrinkage and forward interference effect.

Synthesis of PPy–silver nanocomposites via in situ oxidative polymerization

“…It is one of the important green chemistry processes to prepare multifunctional polymers. This method has been widely used to prepare different types of conducting polymers and their different derivatives [1,5,[9][10][11][12][13][14][15][16][17]. The preparation of nanocomposite of PPy and organic nanoparticles becomes a novel challenge for investigators.…”

Facile fabrication of novel silver-polypyrrole-multiwall carbon nanotubes nanocomposite for replacement of platinum in dye-sensitized solar cell

“…Therefore strong interaction occurred between FMWCNTS and the quinoid rings of polymer chains in composite film which permote the charge transportation between the two constituents that increases the average localization length and hence the composite sample has increased conductivity. 45,46 The electrical conductivity of Ag-PPy-FMWCNTS(226Scm −1 ) is higher than pure PPy and PPy-FMWCNTS. The incorporation of silver nanoparticles in PPy-FMWCNTS provides a unique pathway for facial electron movement and causes an enhancement in conductivity.…”

“…In case of PPy-FMWCNTS composite the peaks centered at 26.93 0 ,41.43 0 and 50.99 0 could be attributed to (002) (100) and (004) reflection of graphite from MWCNTS. 45 characteristic peaks of PPy-FMWCNTS with little shift in peak position and decreased intensity are also present in Ag-PPy-FMWCNTS composite. These results confirm the crystalline nature of Ag-PPy-FMWCNTS composite.…”

“…The peak at approximately 1629 cm −1 and 1550 cm −1 could be ascribed to C-N and C-C asymmetric and symmetric ring vibration.The arrangement of peaks confirms the synthesis of PPy. [43][44][45] The FTIR spectra suggest that all the characteristic peaks of PPy and FMWCNTS are present in nanocomposite (PPy-FMWCNTS) and C-H, C-C, N-H become weaker and C-N bond become stronger in nanocomposite. It is found that inclusion of FMWCNTS into PPy results a little peak shift with enhanced intensity, this is due to the presence of carboxy group on the nanotube surface that gives the interaction on the different reaction sites of PPy that facilitate the fast electron transport between PPy and FMWCNTS.…”

“…It is found that inclusion of FMWCNTS into PPy results a little peak shift with enhanced intensity, this is due to the presence of carboxy group on the nanotube surface that gives the interaction on the different reaction sites of PPy that facilitate the fast electron transport between PPy and FMWCNTS. 42,45 The electrical conductivity of various CEs electrodes were measured by four probe instrument and summarized in table I.…”