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Title: UV-activated room temperature NO{sub 2} gas sensing using In{sub 2}Ge{sub 2}O{sub 7} nanofiber sensors

Graphical abstract: The In{sub 2}Ge{sub 2}O{sub 7} nanofiber gas sensors showed a remarkably enhanced response to NO{sub 2} gas at room temperature under ultraviolet (UV) light illumination. The response of the In{sub 2}Ge{sub 2}O{sub 7} nanofibers to NO{sub 2} gas at room temperature increased from ∼104 to ∼601% with increasing the UV light illumination intensity from 0 to 1.2 mW/cm{sup 2}. - Highlights: • In{sub 2}Ge{sub 2}O{sub 7} nanofibers were synthesized using a thermal evaporation technique. • The In{sub 2}Ge{sub 2}O{sub 7} nanofibers were single crystals and 50–100 nm in diameter. • The In{sub 2}Ge{sub 2}O{sub 7} nanofibers showed a remarkably enhanced response to NO{sub 2} gas under UV illumination. • The origin of the enhanced response by UV irradiation is discussed. - Abstract: In{sub 2}Ge{sub 2}O{sub 7} nanofibers were synthesized using a thermal evaporation technique. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction revealed that the nanofibers were single crystals and 50–100 nm in diameter and up to a few hundreds of micrometers in length. The sensing properties of multiple networked In{sub 2}Ge{sub 2}O{sub 7} nanofiber sensors toward NO{sub 2} gas at room temperature under UV irradiation were examined. The In{sub 2}Ge{sub 2}O{sub 7} nanofiber gas sensors showedmore » a remarkably enhanced response to NO{sub 2} gas at room temperature under ultraviolet (UV) light illumination. The response of the In{sub 2}Ge{sub 2}O{sub 7} nanofibers to NO{sub 2} gas at room temperature increased from ∼104 to ∼601% with increasing the UV light illumination intensity from 0 to 1.2 mW/cm{sup 2}. The significant improvement in the response of the In{sub 2}Ge{sub 2}O{sub 7} nanofibers to NO{sub 2} gas by UV irradiation is attributed to the increased change in resistance due to the increase in the number of electrons participating in the reactions with NO{sub 2} molecules by photo-generation of electron–hole pairs.« less
Authors:
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Publication Date:
OSTI Identifier:
22420579
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 58; Conference: IFFM2013: International forum on functional materials, Jeju City (Korea, Republic of), 27-29 Jun 2013; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRICAL PROPERTIES; ELECTRON DIFFRACTION; EVAPORATION; GERMANATES; HOLES; INDIUM COMPOUNDS; IRRADIATION; MOLECULES; MONOCRYSTALS; NANOFIBERS; NITROGEN DIOXIDE; SCANNING ELECTRON MICROSCOPY; SENSORS; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; X-RAY DIFFRACTION