The random distribution of TiO2 anatase nanoparticle in PPy matrix forms variety of carrier barriers on the surface and inside of the materials. As expectation, the charge exchange between oxygen and the PPy affects the carrier barrier’s regions and then modify the electrical properties of PPy. | Communications in Physics, Vol. 28, No. 1 (2018), pp. 87-96 DOI: EFFECT OF TiO2 ANATASE NANOCRYSTALLITE ON ELECTRICAL PROPERTIES OF PPY/TiO2 NANOCOMPOSITE DUONG NGOC HUYEN1,† , THANH-PHUONG NGUYEN1 AND NGUYEN TRONG TUNG1,2 1 School of Engineering Physics, Hanoi University of Science and Technology No. 1 Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam 2 College of Television Vietnam, Thuong Tin, Hanoi 158500, Viet Nam. † E-mail: Received 30 December 2017 Accepted for publication 19 January 2018 Published 26 March 2018 Abstract. Polypyrrole/titanium dioxide nanocomposite (PPy/TiO2 ) was synthesized by in-situ chemical polymerization of pyrrole (Py) monomer in colloidal suspension of TiO2 anatase. TEM images show that TiO2 anatase nanoparticles with size of around 3–4 nm are randomly imbedded on the surface and inside of PPy grain. The random distribution of TiO2 anatase nanoparticle in PPy matrix forms variety of carrier barriers on the surface and inside of the materials. As expectation, the charge exchange between oxygen and the PPy affects the carrier barrier’s regions and then modify the electrical properties of PPy. Upon exposure to the open air the conductivity of the PPy/TiO2 nanocomposite exhibits an increase of about 20 folds much larger than that of neat PPy. The enhancement is accounted for the modification of in the surface conductance of PPy/TiO2 nanocomposite as a combination of the TiO2 coupling and oxygen interaction. Keywords: PPy, TiO2 anatase, nanocomposite PPy/TiO2 , complex impedance spectrum. Classification numbers: ; ; . I. INTRODUCTION The unique structure of alternative single and double bonds in the linear chain of intrinsic conjugated polymers (CPs) [1,2] has found to be susceptible to the ambient chemical and physical interactions. Consequently, the polymer chain will lose or attract some electrons and then converts to either p-type or n-type semiconducting. .
