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Mechanism of photoinduced charge transfer at MEH-PPV and titanium dioxide nanoparticle interface

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Title Mechanism of photoinduced charge transfer at MEH-PPV and titanium dioxide nanoparticle interface
 
Creator Shankar, Jaya Seeli
Kumar, Sangeetha Ashok
Periyasami, Bhuvana K
Nayak, Sanjay K
 
Subject Charge transfer
Conjugated polymer
Hybrid polymer nanocomposite (HPNC)
Photoluminescence quenching
Photovoltaics
 
Description 1278-1284
In this study, we investigated mechanisms of photoinduced electron transfer from a conjugated polymer (poly(2-methoxy-5-(2-ethylhexyloxy) 1,4-phenylenevinylene (MEH-PPV) to titanium dioxide (TiO2) nanoparticles (acceptor) through steady-state photoluminescence (PL) spectroscopy. Since mixed phase TiO2 has better photocatalytic compared to single phase, it is an efficient charge separation process during photoexcitation of polymer nanocomposites by incorporating the mixed phase TiO2 nanoparticles into the MEH-PPV polymer matrix through in situ polymerization. Structural characterization revealed only physical interaction between the polymer matrix and dispersed nanoparticles. The absorbance spectra of nanocomposites also indicated the absence of ground state complex formation. Luminescence quenching of polymer nanocomposites compared to pristine MEH-PVV signifies the charge transfer taking place at the MEH-PPV/TiO2 interfaces. Thus, the MEH-PPV/ mixed phase TiO2 nanocomposite serves as an active layer for photovoltaic application.
 
Date 2020-09-26T08:29:14Z
2020-09-26T08:29:14Z
2020-09
 
Type Article
 
Identifier 0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/55351
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJC-A Vol.59A(09) [September 2020]