NO2 sensing characteristics of copper phthalocyanine films

Effects of low temperature annealing and doping time

Yuh-Lang Lee, Chi Hsiu Chang

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Low temperature annealing was performed on CuPc films to evaluate the possible structure transformation of the sensing films during the gas sensing period. The effects of heat annealing, as well as the doping time of NO2, on the sensing characteristics of CuPc films were investigated. The result shows that the structure transformation cannot be avoided even at a temperature as low as 100 °C. The structure transformation causes a decrease in film resistance and sensitivity to NO2, but an increase in response rate. After the NO2 doping period, the CuPc films cannot recover completely to the original resistance before doping due to the possible structure transformation and the deep diffusion of NO2 into the bulk crystal. The incomplete recovery problem of CuPc films can be solved by using responsivity instead of film resistance. The doping curves for the succeeding sensing cycles are nearly coincident, indicating that the change in film characteristics, resulted from the irreversible doping or structure transformation, can be eliminated by the present treatment. The experiments on the NO2 doping time show that a longer doing period causes a higher responsivity but a slower recovery rate.

Original languageEnglish
Pages (from-to)174-179
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume119
Issue number1
DOIs
Publication statusPublished - 2006 Nov 24

Fingerprint

Doping (additives)
Annealing
Copper
copper
annealing
Temperature
recovery
Recovery
copper phthalocyanine
causes
Gases
heat
Crystals
cycles
sensitivity
curves
gases
crystals
Experiments
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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NO2 sensing characteristics of copper phthalocyanine films : Effects of low temperature annealing and doping time. / Lee, Yuh-Lang; Chang, Chi Hsiu.

In: Sensors and Actuators, B: Chemical, Vol. 119, No. 1, 24.11.2006, p. 174-179.

Research output: Contribution to journalArticle

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AB - Low temperature annealing was performed on CuPc films to evaluate the possible structure transformation of the sensing films during the gas sensing period. The effects of heat annealing, as well as the doping time of NO2, on the sensing characteristics of CuPc films were investigated. The result shows that the structure transformation cannot be avoided even at a temperature as low as 100 °C. The structure transformation causes a decrease in film resistance and sensitivity to NO2, but an increase in response rate. After the NO2 doping period, the CuPc films cannot recover completely to the original resistance before doping due to the possible structure transformation and the deep diffusion of NO2 into the bulk crystal. The incomplete recovery problem of CuPc films can be solved by using responsivity instead of film resistance. The doping curves for the succeeding sensing cycles are nearly coincident, indicating that the change in film characteristics, resulted from the irreversible doping or structure transformation, can be eliminated by the present treatment. The experiments on the NO2 doping time show that a longer doing period causes a higher responsivity but a slower recovery rate.

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