Positron annihilation studies on chalcone chromophore doped PVA

R. F. Bhajantri, V. Ravindrachary, A. Harisha, Ismayil, C. Ranganathaiah

Research output: Contribution to journalConference article

9 Citations (Scopus)

Abstract

A novel organic non-linear optical material 1-(4-methylphenyl)-3-(4- N, N dimethyl amino phenyl)-2-propen-1-one (MPDMAPP) chalcone chromophore has been synthesized by standard method. Pure and MPDMAPP doped Poly(vinyl alcohol) films are prepared using solution casting method and characterized using UV-Visible absorption and Positron Annihilation Lifetime Spectroscopy. The optical spectroscopic study shows three absorption bands, 196-202 nm assigned to localized n→π* transitions, 205-320 nm to n→π* inter-band and 385-428 nm assigned to π→π* transition and arises due to the charge transfer complex. Using observed UV-Vis spectra, three optical energy gaps, Eg1 (4.96-4.25 eV), Eg2 (3.47-3.32 eV) and Eg3 (2.33-2.24 eV) have been estimated. The observed change in Eg upon doping is understood based on the formation of charge transfer complex arising from the - HC=CH- structure present in the composite and due to the interactions of dopant and OH group of PVA. The PALS results shows that the o-Ps lifetime decreases continuously as doping concentration increases and I3 initially increases (from 18.82% to 20.95%) from 0 wt% to 0.05 wt% and then decreases gradually up to 16.76% for higher dopant concentrations with decrease in optical band gaps. The variation of positron data with Eg is understood by correlating the probability of Ps formation with the complex.

Original languageEnglish
Pages (from-to)2429-2431
Number of pages3
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume6
Issue number11
DOIs
Publication statusPublished - 28-12-2009

Fingerprint

positron annihilation
chromophores
charge transfer
life (durability)
optical materials
positrons
alcohols
methylidyne
absorption spectra
composite materials
spectroscopy
interactions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Bhajantri, R. F. ; Ravindrachary, V. ; Harisha, A. ; Ismayil ; Ranganathaiah, C. / Positron annihilation studies on chalcone chromophore doped PVA. In: Physica Status Solidi (C) Current Topics in Solid State Physics. 2009 ; Vol. 6, No. 11. pp. 2429-2431.
@article{d7d75803674c46de84522dbf7b0b798f,
title = "Positron annihilation studies on chalcone chromophore doped PVA",
abstract = "A novel organic non-linear optical material 1-(4-methylphenyl)-3-(4- N, N dimethyl amino phenyl)-2-propen-1-one (MPDMAPP) chalcone chromophore has been synthesized by standard method. Pure and MPDMAPP doped Poly(vinyl alcohol) films are prepared using solution casting method and characterized using UV-Visible absorption and Positron Annihilation Lifetime Spectroscopy. The optical spectroscopic study shows three absorption bands, 196-202 nm assigned to localized n→π* transitions, 205-320 nm to n→π* inter-band and 385-428 nm assigned to π→π* transition and arises due to the charge transfer complex. Using observed UV-Vis spectra, three optical energy gaps, Eg1 (4.96-4.25 eV), Eg2 (3.47-3.32 eV) and Eg3 (2.33-2.24 eV) have been estimated. The observed change in Eg upon doping is understood based on the formation of charge transfer complex arising from the - HC=CH- structure present in the composite and due to the interactions of dopant and OH group of PVA. The PALS results shows that the o-Ps lifetime decreases continuously as doping concentration increases and I3 initially increases (from 18.82{\%} to 20.95{\%}) from 0 wt{\%} to 0.05 wt{\%} and then decreases gradually up to 16.76{\%} for higher dopant concentrations with decrease in optical band gaps. The variation of positron data with Eg is understood by correlating the probability of Ps formation with the complex.",
author = "Bhajantri, {R. F.} and V. Ravindrachary and A. Harisha and Ismayil and C. Ranganathaiah",
year = "2009",
month = "12",
day = "28",
doi = "10.1002/pssc.200982109",
language = "English",
volume = "6",
pages = "2429--2431",
journal = "Physica Status Solidi (C) Current Topics in Solid State Physics",
issn = "1862-6351",
publisher = "Wiley-VCH Verlag",
number = "11",

}

Positron annihilation studies on chalcone chromophore doped PVA. / Bhajantri, R. F.; Ravindrachary, V.; Harisha, A.; Ismayil; Ranganathaiah, C.

In: Physica Status Solidi (C) Current Topics in Solid State Physics, Vol. 6, No. 11, 28.12.2009, p. 2429-2431.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Positron annihilation studies on chalcone chromophore doped PVA

AU - Bhajantri, R. F.

AU - Ravindrachary, V.

AU - Harisha, A.

AU - Ismayil,

AU - Ranganathaiah, C.

PY - 2009/12/28

Y1 - 2009/12/28

N2 - A novel organic non-linear optical material 1-(4-methylphenyl)-3-(4- N, N dimethyl amino phenyl)-2-propen-1-one (MPDMAPP) chalcone chromophore has been synthesized by standard method. Pure and MPDMAPP doped Poly(vinyl alcohol) films are prepared using solution casting method and characterized using UV-Visible absorption and Positron Annihilation Lifetime Spectroscopy. The optical spectroscopic study shows three absorption bands, 196-202 nm assigned to localized n→π* transitions, 205-320 nm to n→π* inter-band and 385-428 nm assigned to π→π* transition and arises due to the charge transfer complex. Using observed UV-Vis spectra, three optical energy gaps, Eg1 (4.96-4.25 eV), Eg2 (3.47-3.32 eV) and Eg3 (2.33-2.24 eV) have been estimated. The observed change in Eg upon doping is understood based on the formation of charge transfer complex arising from the - HC=CH- structure present in the composite and due to the interactions of dopant and OH group of PVA. The PALS results shows that the o-Ps lifetime decreases continuously as doping concentration increases and I3 initially increases (from 18.82% to 20.95%) from 0 wt% to 0.05 wt% and then decreases gradually up to 16.76% for higher dopant concentrations with decrease in optical band gaps. The variation of positron data with Eg is understood by correlating the probability of Ps formation with the complex.

AB - A novel organic non-linear optical material 1-(4-methylphenyl)-3-(4- N, N dimethyl amino phenyl)-2-propen-1-one (MPDMAPP) chalcone chromophore has been synthesized by standard method. Pure and MPDMAPP doped Poly(vinyl alcohol) films are prepared using solution casting method and characterized using UV-Visible absorption and Positron Annihilation Lifetime Spectroscopy. The optical spectroscopic study shows three absorption bands, 196-202 nm assigned to localized n→π* transitions, 205-320 nm to n→π* inter-band and 385-428 nm assigned to π→π* transition and arises due to the charge transfer complex. Using observed UV-Vis spectra, three optical energy gaps, Eg1 (4.96-4.25 eV), Eg2 (3.47-3.32 eV) and Eg3 (2.33-2.24 eV) have been estimated. The observed change in Eg upon doping is understood based on the formation of charge transfer complex arising from the - HC=CH- structure present in the composite and due to the interactions of dopant and OH group of PVA. The PALS results shows that the o-Ps lifetime decreases continuously as doping concentration increases and I3 initially increases (from 18.82% to 20.95%) from 0 wt% to 0.05 wt% and then decreases gradually up to 16.76% for higher dopant concentrations with decrease in optical band gaps. The variation of positron data with Eg is understood by correlating the probability of Ps formation with the complex.

UR - http://www.scopus.com/inward/record.url?scp=72449125714&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=72449125714&partnerID=8YFLogxK

U2 - 10.1002/pssc.200982109

DO - 10.1002/pssc.200982109

M3 - Conference article

VL - 6

SP - 2429

EP - 2431

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

JF - Physica Status Solidi (C) Current Topics in Solid State Physics

SN - 1862-6351

IS - 11

ER -