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ABSRACT: Measurement of ionizing radiation using cabon nanotubes FET
Physics in Medicine and Biology
Volume 50, 7 February 2005
http://www.iop.org/EJ/toc/-alert=1462/0031-9155/50/3
. . .
Measurement of ionizing radiation using carbon
nanotube field effect transistor
Xiao-Wu Tang, Yong Yang, Woong Kim, Qian Wang,
Pengfei Qi, Hongjie Dai and Lei Xing
2005 Phys. Med. Biol. 50 N23-N31
Abstract:
http://www.iop.org/EJ/abstract/-alert=1462/0031-9155/50/3/N02
Full text:
http://www.iop.org/EJ/article/-alert=1462/0031-9155/50/3/N02/pmb5_3_n02.pdf
Single-walled carbon nanotubes (SWNTs) are a new
class of highly promising nanomaterials for future
nano-electronics. Here, we present an initial
investigation of the feasibility of using SWNT field
effect transistors (SWNT-FETs) formed on silicon-oxide
substrates and suspended FETs for radiation dosimetry
applications. Electrical measurements and atomic
force microscopy (AFM) revealed the intactness of
SWNT-FET devices after exposure to over 1 Gy of 6 MV
therapeutic x-rays. The sensitivity of SWNT-FET
devices to x-ray irradiation is elucidated by
real-time dose monitoring experiments and accumulated
dose reading based on threshold voltage shift.
SWNT-FET devices exhibit sensitivities to x-rays that
are at least comparable to or orders of magnitude
higher than commercial MOSFET (metal-oxide
semiconductor field effect transistor) dosimeters and
could find applications as miniature dosimeters for
microbeam profiling and implantation.
. . .
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