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Sensing materials based on ionic liq...

Georgia Institute of Technology.

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Sensing materials based on ionic liquids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sensing materials based on ionic liquids./
Author:	Saheb, Amir H.
Description:	119 p.
Notes:	Adviser: Jiri A. Janata.
Contained By:	Dissertation Abstracts International69-09B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3327650
ISBN:	9780549800897

Sensing materials based on ionic liquids.
Saheb, Amir H.

Sensing materials based on ionic liquids. - 119 p.

Adviser: Jiri A. Janata.

Thesis (Ph.D.)--Georgia Institute of Technology, 2008.

The first chapter of this thesis describes the motivation behind using room temperature ionic liquids (RTILs) in gas sensor research and provides the reader with background knowledge of RTILs and a review of current applications of RTILs in various sensors.

ISBN: 9780549800897Subjects--Topical Terms:

586156
Chemistry, Analytical.

Sensing materials based on ionic liquids.
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008 100804s2008 ||||||||||||||||| ||eng d
020 $a 9780549800897
035 $a (UMI)AAI3327650
035 $a AAI3327650
040 $a UMI $c UMI
100 1 $a Saheb, Amir H. $3 1036056
245 1 0 $a Sensing materials based on ionic liquids.
300 $a 119 p.
500 $a Adviser: Jiri A. Janata.
500 $a Source: Dissertation Abstracts International, Volume: 69-09, Section: B, page: 5373.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2008.
520 $a The first chapter of this thesis describes the motivation behind using room temperature ionic liquids (RTILs) in gas sensor research and provides the reader with background knowledge of RTILs and a review of current applications of RTILs in various sensors.
520 $a The second chapter describes electrochemical polymerization of aniline in room temperature 1-butyl-3-methylimmidazolium (BMI) ionic liquids without addition of any acid. It is shown that the polymerization of aniline in BMI(BF 4) does require small but controlled amounts of water whereas the polymerization in BMI(PF6) and in BMI(TF2N) does not require any water addition. Differences in the cyclic voltammograms during polymerization of aniline are observed. In addition, all the synthesized polyaniline films show stable electroactivity in a wide potential range.
520 $a The third chapter describes the construction of reference electrodes for RTIL applications that have a known and reproducible potential versus the ferrocene/ferrocenium couple. They are based on reference electrodes of the first kind, Ag/Ag+ couple type, or of the second kind, based on Ag/AgCl in M+Cl-. The former uses AgNO3 salt and the latter tetrabutylammonium chloride, Bu 4N+Cl-, dissolved in acetonitrile which are then introduced to the ionic liquid of choice for a final concentration of 0.1M. The stability, reproducibility, and temperature behavior of the two reference systems have been characterized in the following ionic liquids: 1-butyl-3-methylimidazolium tetrafluoroborate [BMI(BF4)], 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [BMI(TF2N)], and 1-butyl-3-methylimidazolium hexafluorophosphate [BMI(PF6)].
520 $a The fourth chapter describes the electrochemical preparation and spectral analysis of gold clusters by adding gold atoms one-by-one ("bottom up" approach) through polyaniline's ability to form a strong complex with chloroaurate at the protonated imine sites. It is contrasted with the "top down" approach in which the growth of multi-atom Au clusters was also controlled electrochemically. Our results confirm that both the amount and the size of gold clusters affects the properties of the composite material.
520 $a The fifth chapter describes the development and characterization of a CHEMFET sensing layer based on a composite of CSA-doped polyaniline (PANI), and the room temperature ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, BMI(TF2N) for the sensing of ammonia gas. The work function responses of the cast films with and without IL are analyzed by "step-wise" changes of ammonia gas concentration from 0.5 to 694 ppm in air as a function of the mole fraction of IL to PANI. The PANI·CSA/BMI(TF2N) layers shows enhanced sensitivities, lower detection limit and shorter response times. There is a strong indication that ammonia also forms a charge transfer complex with imidazolium cation in which it acts as an electron acceptor.
520 $a The final chapter describes the preparation and characterization of field-effect transistors with mixed ionic-electronic conductors that have been created by varying the ratio of room temperature ionic liquid and emeraldine salt of polyaniline. Transistor with sufficiently high electronic conductivity (32mol% ES-PANI) and Au gate contact exhibited theoretical behavior of insulated gate field-effect transistor. On the other hand the purely ionic gate behaved irreproducibly, indicating that a capacitive divider has been formed in the gate.
590 $a School code: 0078.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0486
690 $a 0494
690 $a 0495
710 2 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 69-09B.
790 $a 0078
790 1 0 $a Janata, Jiri A., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3327650