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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/75107
Título: 
The role of hierarchical morphologies in the superior gas sensing performance of CuO-based chemiresistors
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Massachusetts Institute of Technology (MIT)
  • Samsung Electronics Corporation
ISSN: 
  • 1616-301X
  • 1616-3028
Resumo: 
The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest given their potential for addressing important technological challenges. This work presents new insight towards the development of high-performance p-type semiconductor gas sensors. Gas sensor test devices, based on copper (II) oxide (CuO) with innovative and unique designs (urchin-like, fiber-like, and nanorods), are prepared by a microwave-assisted synthesis method. The crystalline composition, surface area, porosity, and morphological characteristics are studied by X-ray powder diffraction, nitrogen adsorption isotherms, field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Gas sensor measurements, performed simultaneously on multiple samples, show that morphology can have a substantial influence on gas sensor performance. An assembly of urchin-like structures is found to be most effective for hydrogen detection in the range of parts-per-million at 200 °C with 300-fold larger response than the previously best reported values for semiconducting CuO hydrogen gas sensors. These results show that morphology plays an important role in the gas sensing performance of CuO and can be effectively applied in the further development of gas sensors based on p-type semiconductors. High-performance gas sensors based on CuO hierarchical morphologies with in situ gas sensor comparison are reported. Urchin-like morphologies with high hydrogen sensitivity and selectivity that show chemical and thermal stability and low temperature operation are analyzed. The role of morphological influences in p-type gas sensor materials is discussed. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Data de publicação: 
12-Abr-2013
Citação: 
Advanced Functional Materials, v. 23, n. 14, p. 1759-1766, 2013.
Duração: 
1759-1766
Palavras-chaves: 
  • copper(II) oxide
  • gas sensors
  • morphology
  • semiconductors
  • urchin-like structures
  • Field emission scanning electron microscopy
  • Hierarchical morphology
  • Microwave assisted synthesis
  • Morphological characteristic
  • Nitrogen adsorption isotherm
  • p-Type semiconductor gas sensors
  • Technological challenges
  • Urchin-like structures
  • Chemical detection
  • Chemical sensors
  • Copper
  • Copper oxides
  • Design
  • Functional materials
  • Gas sensing electrodes
  • Hydrogen
  • Low temperature operations
  • Morphology
  • Nanorods
  • Semiconductor materials
  • Transmission electron microscopy
  • X ray powder diffraction
  • Gas detectors
Fonte: 
http://dx.doi.org/10.1002/adfm.201202332
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/75107
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