| Title: | Thin films of block copolymer blends for enhanced performance of acoustic wave-based chemical sensors |
| Author(s): | Lipert RJ; Shinar R; Vaidya B; Pris AD; Porter MD; Liu G; Grabau TD; Dilger JP; |
| Address: | "Microanalytical Instrumentation Center, Department of Chemistry, and Ames Laboratory-USDOE, Iowa State University, Ames, Iowa 50011, USA. blipert@porter1.ameslab.gov" |
| ISSN/ISBN: | 0003-2700 (Print) 0003-2700 (Linking) |
| Abstract: | "The performance of quartz crystal oscillator-based volatile organic compound (VOC) sensors has been enhanced by using coatings made from poly(styrene-block-ethylene-co-butylene-block-styrene) block copolymers blended with resins and homopolymers. Enhanced performance is characterized by a wider operational temperature range (-10 to +50 degrees C) over which the sensors displayed, concurrently, an analyte sensitivity of >0.2 Hz/ppm toluene, minimal energy loss (resistance <120 ohms), and response times of <20 min (time required to reach 90% of full response). Atomic force microscopy images are consistent with a process in which the additive associates with the polystyrene portions of the microphase-separated block copolymer. This association reinforces the rigidity of the polystyrene network while allowing the rapid uptake of VOCs by the softer polyethylene/butylene phase" |
| Keywords: | "Air Pollutants/*analysis Environmental Monitoring/*instrumentation Microscopy, Atomic Force Polyenes/chemistry Polyethylene/chemistry Polymers/*chemistry Polystyrenes/chemistry *Quartz Temperature Toluene/*analysis/chemistry;" |
| Notes: | "MedlineLipert, Robert J Shinar, Ruth Vaidya, Bikas Pris, Andrew D Porter, Marc D Liu, Guojun Grabau, Ted D Dilger, John P eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2003/01/04 Anal Chem. 2002 Dec 15; 74(24):6383-91. doi: 10.1021/ac0260490" |
