Capacitive Transduction for Liquid Crystal Based Sensors, Part II: Partially Disordered System

被引：11

作者：

Abu-Abed, Alaeddin S. ^{[1
]}

Lindquist, Robert G. ^{[1
]}

机构：

[1] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA

来源：

IEEE SENSORS JOURNAL | 2008年 / 8卷 / 9-10期

基金：

美国国家科学基金会;

关键词：

Biosensors; capacitive sensing; chemical sensors; liquid crystal (LC); neuro-fuzzy;

D O I：

10.1109/JSEN.2008.925451

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents the capacitive transduction technique involved with liquid crystal (LC) based sensors in partially disordered systems. These sensors have the potential applications in chemical and biological systems. The theory for tracking the average molecular deformation (state of alignment) and degree of ordering of anisotropic and partially disordered LC film via capacitive sensing is investigated. This system is modeled using the Q-tensor approach in modeling uniaxial LC material. The proposed sensor design is an interdigitated electrodes structure. Transverse and fringing capacitances as function of the molecular deformation are calculated. It is verified that three capacitance measurements are required to track the average molecular orientation and the degree of disorder in the LC film. The sensitivity for the sensor at different alignments and ordering degree is also studied. Toward practical sensor, neuro-fuzzy system is modeled to simulate the capacitive transduction and to monitor the LC profile. Sensors are fabricated and tested. Both the experimental and calculated capacitances are presented and compared.

引用

页码：1557 / 1564

页数：8

共 26 条

[1] Capacitive transduction for liquid crystal-based sensors, part I: Ordered system [J].

Abu-Abed, Alaeddin ;

Lindquist, Robert G. ;

Choi, Woo-Hyuck .

IEEE SENSORS JOURNAL, 2007, 7 (11-12) :1617-1624

[2]

ABUABED A, 2007, P 6 IEEE C SENS ATL

[3] Use of surface plasmon resonance biosensor technology as a possible alternative to detect differences in binding of enantiomeric drug compounds to immobilized albumins [J].

Ahmad, A ;

Ramakrishnan, A ;

McLean, MA ;

Breau, AP .

BIOSENSORS & BIOELECTRONICS, 2003, 18 (04) :399-404

[4]

[Anonymous], 1997, NEURO FUZZY SOFT COM

[5] Biomolecular interactions at phospholipid-decorated surfaces of liquid crystals [J].

Brake, JM ;

Daschner, MK ;

Luk, YY ;

Abbott, NL .

SCIENCE, 2003, 302 (5653) :2094-2097

[6] Near real-time biosensor-based detection of 2,4-dinitrophenol [J].

Carter, RM ;

Blake, RC ;

Nguyen, TD ;

Bostanian, LA .

BIOSENSORS & BIOELECTRONICS, 2003, 18 (01) :69-72

[7] Identification of antigenic peptide recognized by the anti-JL1 leukemia-specific monoclonal antibody from combinatorial peptide phage display libraries [J].

Chung, J ;

Park, S ;

Kim, D ;

Rhim, J ;

Kim, I ;

Choi, I ;

Yi, K ;

Ryu, S ;

Suh, P ;

Chung, D ;

Bae, Y ;

Shin, Y ;

Park, SH .

JOURNAL OF CANCER RESEARCH AND CLINICAL ONCOLOGY, 2002, 128 (12) :641-649

[8]

de Gennes PG., 1994, The physics of liquid crystals

[9]

de Jeu W.H., 1980, Physical Properties of Liquid Crystalline Materials

[10] COPLANAR WAVE-GUIDES FOR MMIC APPLICATIONS - EFFECT OF UPPER SHIELDING, CONDUCTOR BACKING, FINITE-EXTENT GROUND PLANES, AND LINE-TO-LINE COUPLING [J].

GHIONE, G ;

NALDI, CU .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 1987, 35 (03) :260-267

← 1 2 3 →