A Tunable Photosensor

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A pyrene-modified beta-cyclodextrin (pyrenecyclodextrin)-decorated single-walled carbon nanotube (SWNT) field-effect transistor (FET) device was fabricated, which can serve as a tunable photosensor to sense a fluorescent adamantyl-modified Ru complex (ADA-Ru). When the light is on (l = 40 W m(-2) and lambda = 280 nm), the transfer curve of the pyrenecyclodextrin-SWNT/FET device shifts toward a negative gate voltage by about 1.6 V and its sheet resistance increases quickly, indicating a charge-transfer process from the pyrenecyclodextrins to the SWNTs. In contrast, the transfer curve of the pyrenecyclodextrin SWNT/FET device in the presence of the ADA-Ru complex shifts toward a positive gate voltage by about 1.9 V and its sheet resistance decreases slowly when the light is on (l = 40 W m(-2) and lambda = 490 nm), showing a charge-transfer process from the pyrenecyclodextrin-SWNT hybrids to the ADA-Ru complex. Because these photoresponse processes are recoverable following the removal of the light, the present photosensor exhibits a promising application in the area of tunable light detection.
Publisher
AMER CHEMICAL SOC
Issue Date
2008-12
Language
English
Article Type
Article
Keywords

WALLED CARBON NANOTUBES; DONOR-ACCEPTOR NANOHYBRIDS; FIELD-EFFECT TRANSISTORS; PHOTOINDUCED ELECTRON-TRANSFER; CHEMICAL SENSORS; NONCOVALENT FUNCTIONALIZATION; CHARGE-TRANSFER; SIDEWALL FUNCTIONALIZATION; COMPLEXES; COMPOSITES

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.50, pp.16996 - 17003

ISSN
0002-7863
DOI
10.1021/ja805393b
URI
http://hdl.handle.net/10203/87042
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