TY - JOUR
T1 - Highly sensitive hydrogen gas sensors using single-walled carbon nanotubes grafted with Pd nanoparticles
AU - Ju, Seonghwa
AU - Lee, Jun Min
AU - Jung, Yeongri
AU - Lee, Eunsongyi
AU - Lee, Wooyoung
AU - Kim, Sung Jin
N1 - Funding Information:
This work was supported by the Agency for Defense Development through the Defense Nano Technology Application Center , the Seoul Research and Business Development Program ( 10816 ), a Basic Research Program grant ( R01-2008-000-21078-0 ) and National Research Foundation of Korea Grant funded by the Korea Government (20090063004).
PY - 2010/4/8
Y1 - 2010/4/8
N2 - We have investigated the hydrogen gas sensing performance of single-walled carbon nanotubes (SWCNTs) grafted with Pd nanoparticles (NPs). The SWCNTs, modified with dendrimers before grafting, were found to have a much faster response time (3 s) and better recovery but lower response (8.6%) at 10,000 ppm hydrogen gas than those prepared without the dendrimer template (253 s, 25%). This can be ascribed to the dipole moments induced by the dendrimers. Removal of the dendrimers by heat treatment resulted in high response (25%), a fast response time (7 s) at 10,000 ppm hydrogen gas, and an ultra-low concentration H2 detection of 10 ppm at room temperature. In addition, this sample was found to satisfy Sievert's law. Our results demonstrate that SWCNTs grafted with Pd-NPs through a dendrimer-mediated process can be used to fabricate highly sensitive hydrogen gas sensors that exhibit a broad dynamic detection range, fast response times, and excellent recovery.
AB - We have investigated the hydrogen gas sensing performance of single-walled carbon nanotubes (SWCNTs) grafted with Pd nanoparticles (NPs). The SWCNTs, modified with dendrimers before grafting, were found to have a much faster response time (3 s) and better recovery but lower response (8.6%) at 10,000 ppm hydrogen gas than those prepared without the dendrimer template (253 s, 25%). This can be ascribed to the dipole moments induced by the dendrimers. Removal of the dendrimers by heat treatment resulted in high response (25%), a fast response time (7 s) at 10,000 ppm hydrogen gas, and an ultra-low concentration H2 detection of 10 ppm at room temperature. In addition, this sample was found to satisfy Sievert's law. Our results demonstrate that SWCNTs grafted with Pd-NPs through a dendrimer-mediated process can be used to fabricate highly sensitive hydrogen gas sensors that exhibit a broad dynamic detection range, fast response times, and excellent recovery.
KW - Dendrimers
KW - Heat treatment
KW - Pd nanoparticles
KW - Single-walled carbon nanotube
UR - http://www.scopus.com/inward/record.url?scp=77949918945&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2010.01.055
DO - 10.1016/j.snb.2010.01.055
M3 - Article
AN - SCOPUS:77949918945
SN - 0925-4005
VL - 146
SP - 122
EP - 128
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
IS - 1
ER -