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Name (Title):
Qingmin Ji (MANA researcher, Supermolecules group)
Affiliation:
Supermolecules Group, WPI Research Center for Materials
Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: JI.Qingmin@nims.go.jp
Home Page: http://www.nims.go.jp/super/HP/Ji.htm
Presentation Title:
Fabrication of Selectivity Controllable Gas Sensor Film Composed by Hollow Mesoporous
Carbon Capsules
Abstract:
Sensors for various volatile solvents are of increasing significance in daily life to maintain the
safety standards and keeping good environment. The efficiency of a sensor evaluates from their
selectivity and sensibility to the sensing molecules. To accomplish the selectivity on certain
sensing molecules, it always need the adjustment on the structure of the sensor substrate. We
have tried to desire a sensor substrate not only with high selectivity and sensibility, but also
controllable selectivity. Carbon capsule with mesoporous wall and macroporous core was used
for the formation of sensor film into aqueous solution by mixing with different surfactants. With
covering surfactant molecules on the surface of the carbon capsules, we can fabricate stable
carbon capsule films through layer-by-layer technique.
It was shown that anion surfactants covered carbon
capsule preferred to form more homogeneous film
structures than the cation surfactants. The study on the
adsorption properties of the carbon capsule films
indicated high sensitivity and selectivity on aromatic
solvent (with phenyl group) vapors compared with
porous carbon and silica capsule films. It should be due
to the dual pores morphology and benzenoid rings in
the carbon capsule structure favoring the adsorption of
aromatic solvents. In addition, by imprinting certain
molecules in the carbon capsule core, we can control
the selectivity on gas sorption according to the
imprinted molecules. The carbon capsule films were
thus shown as smart sensor films with controllable
selectivity on gases sorption (Figure 1).
References:
1. Ariga, K.; Hill, J. P.; Ji, Q. Phys. Chem. Chem. Phys. 2007, 9, 2319-2340.
2. Ariga, K.; Vinu, A.; Ji, Q. M.; Ohmori, O.; Hill, J. P.; Acharya, S.; Koike, J.; Shiratori, S.
Angew. Chem. Int. Ed. 2008, 47, 7254-7257.
3. Ji, Q.; Miyahara, M.; Hill, J. P.; Acharya, S.; Vinu, A.; Yoon, S. B.; Yu, J. S.; Sakamoto, K.;
Ariga, K. J. Am. Chem. Soc. 2008, 130, 2376-2377.
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Poster Session PM-8
Figure 1. The scheme for carbon capsule film
for controllable selectivity on gas sorption.