TY - GEN
T1 - Nanomaterials enabled chemical sensors
T2 - 2006 5th IEEE Conference on Sensors
AU - Zhao, Zhouying
AU - Arrandale, Mayrita
AU - Carpenter, Michael A.
AU - Vassiltsova, Oxana
AU - Petrukhina, Marina A.
PY - 2006
Y1 - 2006
N2 - Nanocomposite materials composed of CdSe quantum dots embedded in polymer matrices were studied for their potential development and use as highly sensitive and selective hydrocarbon sensing materials. Multi-level selectivity enhancement characteristics have been incorporated into the design of this nanocomposite system to provide the high level of selectivity required for future field measurements. This has been achieved by using a combination of stabilizing and a "surface enhancing" group attached to the surface of CdSe semiconductor quantum dots. Benzoic acid (BA), pentafluorbenzoic acid (FBA) or naphthylamine (NA) was used as the surface enhancing group. The modified QDs were embedded into a poly (methyl methacrylate) polymer film. Reversible photoluminescence changes of the QDs were observed upon exposure to toluene and xylenes vapors. A comparison of the sensitivity and selectivity of the QD-BA, FBA and NA films was made for 50ppm toluene in N2 and 50ppm xylenes in N2 exposures revealed that the QD-FBA film had the best overall performance. By reducing the NA surface group coverage by a factor of 10 the detection limit of the QD-NA films was reduced by a factor of ∼3.
AB - Nanocomposite materials composed of CdSe quantum dots embedded in polymer matrices were studied for their potential development and use as highly sensitive and selective hydrocarbon sensing materials. Multi-level selectivity enhancement characteristics have been incorporated into the design of this nanocomposite system to provide the high level of selectivity required for future field measurements. This has been achieved by using a combination of stabilizing and a "surface enhancing" group attached to the surface of CdSe semiconductor quantum dots. Benzoic acid (BA), pentafluorbenzoic acid (FBA) or naphthylamine (NA) was used as the surface enhancing group. The modified QDs were embedded into a poly (methyl methacrylate) polymer film. Reversible photoluminescence changes of the QDs were observed upon exposure to toluene and xylenes vapors. A comparison of the sensitivity and selectivity of the QD-BA, FBA and NA films was made for 50ppm toluene in N2 and 50ppm xylenes in N2 exposures revealed that the QD-FBA film had the best overall performance. By reducing the NA surface group coverage by a factor of 10 the detection limit of the QD-NA films was reduced by a factor of ∼3.
UR - https://www.scopus.com/pages/publications/50149095613
U2 - 10.1109/ICSENS.2007.355501
DO - 10.1109/ICSENS.2007.355501
M3 - Conference contribution
SN - 1424403766
SN - 9781424403769
T3 - Proceedings of IEEE Sensors
SP - 444
EP - 447
BT - 2006 5th IEEE Conference on Sensors
Y2 - 22 October 2006 through 25 October 2006
ER -