The characterisation of polypyrrole polymer films for electro-chemical sensors

การศึกษาคุณลักษณะของฟิล์มโพลิเมอร์ไพลิไพโรลสำหรับเซนเชอร์เคมี-ไฟฟ้า

Name: Duangkhae Bootkul

Organization : King Mongkut's University of Technology Thonburi

Abstract: An electroconductive membrane containing glucose oxidase wasprepared potentiostatically on a platinum electrode surface. The membranewas a thin film of poly(pyrrole) and the immobilized enzyme waselectrostatically entrapped in the poly(pyrrole) f i l m duringelectropolymerization onto the electrode. The mechanism of catalysis ofthe oxidase enzyme was that the enzyme substrate was oxidised whileoxygen was reduced to hydrogen peroxide. The activity of the enzymewas monitored amperometrically by oxidizing the hydrogen peroxideproduced during the catalytic cycle. This approach was limited by therelatively high potential needed to oxidize peroxide (eg. 0.7 V vs SCE forplatinum), and hence this system had the problem of co-oxidation ofinterferents such as ascorbate. Therefore two methods were examined toreduce interference. In the first, the polymer was overoxidised to createanion-repelling groups which would stop interferents, from reaching theelectrode. In the second, rhodium microparticles were incorporated into thepoly(pyrrole) film by electrodeposition at -0.5 V vs SCE to act as catalystsfor hydrogen peroxide reduction, and thereby enable a lower operatingpotential. The Rh particles were uniformly distributed, with diametersranging from 0.1 to 0.9 pm and a coverage of approximately 4.7 x lo7center cm. This thesis is the first report of an enzyme containingconductive film capable of detecting hydrogen peroxide by reduction. Thiswas achieved with a sensitivity of 1.7 PA r&I-l cm.The study investigated the influence of factors such as monomerconcentration, enzyme concentration and film thickness, on both thepolymer morphology (using SEM) and the current response (usingamperometry). For rhodium-loaded films, the size and distribution of themicroparticles was examined using SEM and EDX.

King Mongkut's University of Technology Thonburi

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Krissanapong Kirtikara

Role: Supervisor

Name: Mithran Somasundrum

Name: Morakot Tanticharoen

Name: Panthip Taotong

Created: 1995

Issued: 2005-04-09

Modified: 2008-06-17

วิทยานิพนธ์/Thesis

ISBN: 9746217595

CallNumber: MT13

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Materials Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	MT13.pdf	1.33 MB	106	2025-02-14 16:59:22
2	MT13ab.pdf	90.82 KB	34	2020-07-21 14:48:59
3	MT13ab.smi	2.18 KB	11	2018-05-13 01:39:23

ใช้เวลา

0.040927 วินาที