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Titolo:
Effects of heat annealing on the film characteristics and gas sensing properties of substituted and un-substituted copper phthalocyanine films
Autore:
Lee, YL; Tsai, WC; Chang, CH; Yang, YM;
Indirizzi:
Chia Nan Univ Pharm & Sci, Dept Appl Chem, Tainan 717, Taiwan Chia Nan Univ Pharm & Sci Tainan Taiwan 717 ppl Chem, Tainan 717, Taiwan Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan Natl Cheng Kung Univ Tainan Taiwan 701 ept Chem Engn, Tainan 701, Taiwan
Titolo Testata:
APPLIED SURFACE SCIENCE
fascicolo: 3-4, volume: 172, anno: 2001,
pagine: 191 - 199
SICI:
0169-4332(20010315)172:3-4<191:EOHAOT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANGMUIR-BLODGETT-FILMS; THIN-FILMS; RESPONSE CHARACTERISTICS; NITROGEN-DIOXIDE; SENSOR; NO2; DEPOSITION; MORPHOLOGY; ADSORPTION; GROWTH;
Keywords:
phthalocyanine; vacuum deposition; heat treatment; gas sensor; film morphology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Lee, YL Chia Nan Univ Pharm & Sci, Dept Appl Chem, Tainan 717, Taiwan ChiaNan Univ Pharm & Sci Tainan Taiwan 717 , Tainan 717, Taiwan
Citazione:
Y.L. Lee et al., "Effects of heat annealing on the film characteristics and gas sensing properties of substituted and un-substituted copper phthalocyanine films", APPL SURF S, 172(3-4), 2001, pp. 191-199

Abstract

Copper phthalocyanine and tetra-tert-butyl copper phthalocyanine were vacuum deposited onto gold electrode. The effects of substrate materials (glassand gold) and post-deposition annealing on the film morphology and crystalline structure were studied. The Aim characteristics were related to their sensing propertied to NO2. The results show that the growth behaviors of CuPc on glass and gold surfaces were different in the early growth stage, buttheir surface morphologies were similar at the later stage. The CuPc filmshave structures of amorphous and beta form crystallite, respectively, on gold and glass surfaces. After heat annealing, the grains grow larger and a beta form structure were obtained on both surfaces. The films without heat treatment show a short response time and higher sensitivity to NO2 due to the higher surface area of their loosely packed fine-grain structure. But this characteristic also causes in-diffusion of NO2 deeply into the bulk crystal and thus, the recovery process is slow and not completely reversible. Comparing with CuPc films, ttb-CuPc films have smoother morphology both on glass and gold and thus, the gas sensitivity is much smaller due to their smaller exposing area for the adsorption of NO2. The ttb-CuPc films have a diffraction peak at D = 16.04 Angstrom after heat annealing. The substitutionof tetra-tert-butyl group into the phthalocyanine ring leads to a larger lattice spacing of crystal, which may be the reason for ttb-CuPc films to have faster recovery process. Because no apparent variation of the crystal morphology was found on the heat-treated ttb-CuPc films, the gas sensing properties vary little due to the heat treatment, (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 23:02:19