Molecular oxygen sensors based on photoluminescent silica aerogels

被引:28
作者
Ayers, MR [1 ]
Hunt, AJ [1 ]
机构
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
关键词
aerogel; oxygen molecules; oxygen concentration; photoluminescence; air pressure;
D O I
10.1016/S0022-3093(98)00051-9
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Photoluminescent silica aerogel acts as the active element of an optical sensor for molecular oxygen. The luminescent aerogel is prepared by the action of energized reducing gases on a standard silica aerogel. Intensity of aerogel photoluminescence decreases as the collision frequency between oxygen molecules and the luminescent carriers in the aerogel matrix increases. This behavior is a characteristic of many photoluminescent materials and arises from a transfer of energy from the aerogel to surrounding oxygen molecules. A sensor for oxygen concentration or air pressure can therefore be simply constructed utilizing an ultraviolet source for excitation and a suitable detector for the emitted visible signal. Stern-Volmer quenching constants for the aerogel sensing element are 1.55 X 10(-2) Torr(-1) for hydrophilic aerogel and 2.4 X 10(-3) Torr(-1) for hydrophobic aerogel. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:343 / 347
页数:5
相关论文
共 11 条
[1]  
AYERS MR, 1997, J NONCRYST SOLIDS
[2]   LUMINESCENCE QUENCHING BEHAVIOR OF AN OXYGEN SENSOR-BASED ON A RU(II) COMPLEX DISSOLVED IN POLYSTYRENE [J].
HARTMANN, P ;
LEINER, MJP ;
LIPPITSCH, ME .
ANALYTICAL CHEMISTRY, 1995, 67 (01) :88-93
[3]   Effects of polymer matrices on calibration functions of luminescent oxygen sensors based on porphyrin ketone complexes [J].
Hartmann, P ;
Trettnak, W .
ANALYTICAL CHEMISTRY, 1996, 68 (15) :2615-2620
[4]   FAST AND SLOW VISIBLE LUMINESCENCE BANDS OF OXIDIZED POROUS SI [J].
KOVALEV, DI ;
YAROSHETZKII, ID ;
MUSCHIK, T ;
PETROVAKOCH, V ;
KOCH, F .
APPLIED PHYSICS LETTERS, 1994, 64 (02) :214-216
[5]   Dissolved oxygen sensor based on fluorescence quenching of oxygen-sensitive ruthenium complexes immobilized in sol-gel-derived porous silica coatings [J].
McEvoy, AK ;
McDonagh, CM ;
MacCraith, BD .
ANALYST, 1996, 121 (06) :785-788
[6]   NOVEL OXYGEN SENSOR MATERIAL BASED ON A RUTHENIUM BIPYRIDYL COMPLEX ENCAPSULATED IN ZEOLITE-Y - DRAMATIC DIFFERENCES IN THE EFFICIENCY OF LUMINESCENCE QUENCHING BY OXYGEN ON GOING, FROM SURFACE-ADSORBED TO ZEOLITE-ENCAPSULATED FLUOROPHORES [J].
MEIER, B ;
WERNER, T ;
KLIMANT, I ;
WOLFBEIS, OS .
SENSORS AND ACTUATORS B-CHEMICAL, 1995, 29 (1-3) :240-245
[7]   DESIGN OF OXYGEN SENSORS BASED ON QUENCHING OF LUMINESCENT METAL-COMPLEXES - EFFECT OF LIGAND SIZE ON HETEROGENEITY [J].
SACKSTEDER, LA ;
DEMAS, JN ;
DEGRAFF, BA .
ANALYTICAL CHEMISTRY, 1993, 65 (23) :3480-3483
[8]   Fibre-optic oxygen sensor based on luminescence quenching of a Pt(II) complex embedded in polymer matrices [J].
VanderDonckt, E ;
Camerman, B ;
Herne, R ;
Vandeloise, R .
SENSORS AND ACTUATORS B-CHEMICAL, 1996, 32 (02) :121-127
[9]   Oxygen sensors based on luminescence quenching of metal complexes: Osmium complexes suitable for laser diode excitation [J].
Xu, WY ;
Kneas, KA ;
Demas, JN ;
DeGraff, BA .
ANALYTICAL CHEMISTRY, 1996, 68 (15) :2605-2609
[10]   OXYGEN SENSORS BASED ON LUMINESCENCE QUENCHING - INTERACTIONS OF PYRENE WITH THE POLYMER SUPPORTS [J].
XU, WY ;
SCHMIDT, R ;
WHALEY, M ;
DEMAS, JN ;
DEGRAFF, BA ;
KARIKARI, EK ;
FARMER, BL .
ANALYTICAL CHEMISTRY, 1995, 67 (18) :3172-3180