Molecular sieve sensors for selective detection at the nanogram level
- Univ. of New Mexico, Albuquerque (USA)
- Sandia National Labs., Albuquerque, NM (USA)
Zeolites have long been known for their molecular sieving properties based upon crystalline pore structures of molecular dimensions. The authors explore strategies to introduce molecular sieving functions into inorganic thin films and membranes which are of current interest for sensor coatings and gas-phase separations. The zeolite films offer high thermal stability (> 770 K) and chemical resistance. Surface acoustic wave devices can be operated as highly sensitive piezoelectric balances that respond to small fractions of single-crystal monolayer adsorption via frequency changes of an oscillator circuit. Since the response is nonselective, a number of organic and organometallic coatings on SAW devices have previously been explored to impart chemical selectivity. The SAW device (97 MHz, detection limit ca. 100 pg/cm{sup 2}) used in the present study to measure selective adsorption of organic vapors (0.1% of saturation in nitrogen flow, 295 K) consists of a single-crystal quartz substrate with interdigital transducers which was coated with zeolite-silica thin films and mounted in a test chamber with gas inlet and outlet.
- OSTI ID:
- 6716718
- Journal Information:
- Journal of the American Chemical Society; (USA), Vol. 111:19; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nanosized AlPO{sub 4}-5 molecular sieves and ultrathin films prepared by microwave synthesis
Synthesis and applications of molecular sieve layers and membranes
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
MOLECULAR SIEVES
ADSORPTION
CALCULATION METHODS
COATINGS
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
THIN FILMS
VAPORS
ZEOLITES
ADSORBENTS
DATA
FILMS
FLUIDS
GASES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
NUMERICAL DATA
SORPTION
400201* - Chemical & Physicochemical Properties
360603 - Materials- Properties