Photoluminescence and Raman evidence for mechanico-chemical interaction of polyaniline-emeraldine base with ZnS in cubic and hexagonal phase

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.12.012· OSTI ID:21612914

Scocioreanu, M; Baibarac, M ^[1]; Baltog, I ^[1]; Pasuk, I; Velula, T ^[1]

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1. National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, MG-7, Bucharest-Magurele R77125 (Romania)

The mechanico-chemical interaction of a polyaniline-emeraldine base (PANI-EB) with ZnS in the cubic and wurtzite phases is studied by Raman spectroscopy and photoluminescence (PL). The results demonstrate that such an interaction leads to the formation of a PANI-salt and metallic Zn. Regardless of the structural form of the ZnS, the formation PANI-salt is indicated by a band in the Raman spectrum that shifts from 1162 to 1176 cm{sup -1} and the appearance of a new band at 1330 cm{sup -1} that indicates the protonated structure of a PANI-salt. The presence of the second product is determined by comparative PL studies performed on ZnS that has interacted mechanico-chemically with PANI-EB and metallic Zn powder. The variations of the PL spectra and their associated excitation spectra are explained as resulting from the charge collection processes that occur in the composite materials produced by the mechanico-chemical interaction between ZnS and PANI-EB or metallic Zn. - Graphical abstract: Photoluminescence spectra of ZnS with cubic (a{sub 1}) and wurtzite (a{sub 2}) structure. Highlights: Black-Right-Pointing-Pointer Mechanico-chemical interaction of polyaniline-emeraldine base with ZnS forms a hybrid material. Black-Right-Pointing-Pointer One used ZnS in two structural forms, cubic and hexagonal. Black-Right-Pointing-Pointer The hexagonal structure was obtained from the cubic structure annealed in vacuum at 1050 Degree-Sign C. Black-Right-Pointing-Pointer The hybrid material was studied by photoluminescence and Raman spectroscopy. Black-Right-Pointing-Pointer A charge collection process activated by the presence of polymer molecules is demonstrated.

• OSTI ID: 21612914
• Journal Information: Journal of Solid State Chemistry, Vol. 186; Other Information: DOI: 10.1016/j.jssc.2011.12.012; PII: S0022-4596(11)00682-7; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHARGE COLLECTION
COMPOSITE MATERIALS
EXCITATION
HYBRIDIZATION
INTERACTIONS
PHOTOLUMINESCENCE
POLYMERS
POWDERS
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SALTS
ZINC SULFIDES
CHALCOGENIDES
EMISSION
ENERGY-LEVEL TRANSITIONS
INORGANIC PHOSPHORS
LASER SPECTROSCOPY
LUMINESCENCE
MATERIALS
PHOSPHORS
PHOTON EMISSION
SPECTRA
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
ZINC COMPOUNDS