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Electrochemical Studies of Colloidal...

Pattiyage Fernando, Ashantha Asiri.

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Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes./
Author:	Pattiyage Fernando, Ashantha Asiri.
Description:	136 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Contained By:	Dissertation Abstracts International75-05B(E).
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3608768
ISBN:	9781303671807

Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes.
Pattiyage Fernando, Ashantha Asiri.

Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes. - 136 p.

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)--University of Nevada, Reno, 2013.

In this thesis we describe a method to detect the collisions of semiconducting nanoparticle colloids by photoelectrochemical (PEC) current events at ultamicroelectrodes (UMEs). As the reference system, we studied oxidation of methanol by the photogenerated holes in the anatase TiO2 NPs (nanoparticles) with and without sensitization. The stepwise behavior of the photocurrent observed at Pt UME denotes long-term interactions of NPs with the UME. NPs interacting with FTO (fluorine doped tin oxide) UME show current oscillations rather than discrete current step observed with Pt UME. Further, the collisions of dye-sensitized TiO2 NPs (DSNPs) at FTO show similar trend as in bare TiO 2 NPs, the magnitude of these oscillations are comparatively larger than those of bare TiO2 NPs. The addition of iodide into the DSNP colloidal suspension did not result in increasing the size of the PEC current oscillations at FTO, as expected based on NPs film behavior. The electrochemical studies of iodide at FTO provide evidence of electrochemical generation of iodine atoms (I*) at FTO. Nitrone spin trapping agents, DMPO (5,5-Dimethyl-1-pyrroline N-oxide) and TMPO (3,3,5,5-Tetramethyl-1-pyrroline N-oxide) were used to investigate the formation of this unstable radical and in the electron paramagnetic resonance (EPR) spectrum the radical intermediates of DMPO and TMPO were observed. The GCMS (gas chromatography-mass spectrometry) analysis of the electrolyte after long term electrolysis of tetrabutyleammonium iodide (TBAI) in acetonitrile is consistent with the formation of I* during the electrolysis process of I- at FTO.

ISBN: 9781303671807Subjects--Topical Terms:

560527
Chemistry, Physical.

Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes.
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100 1 $a Pattiyage Fernando, Ashantha Asiri. $3 2106424
245 1 0 $a Electrochemical Studies of Colloidal Semiconducting Nanoparticles at Ultramicroelectrodes.
300 $a 136 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Adviser: Mario A. Alpuche-Aviles.
502 $a Thesis (Ph.D.)--University of Nevada, Reno, 2013.
520 $a In this thesis we describe a method to detect the collisions of semiconducting nanoparticle colloids by photoelectrochemical (PEC) current events at ultamicroelectrodes (UMEs). As the reference system, we studied oxidation of methanol by the photogenerated holes in the anatase TiO2 NPs (nanoparticles) with and without sensitization. The stepwise behavior of the photocurrent observed at Pt UME denotes long-term interactions of NPs with the UME. NPs interacting with FTO (fluorine doped tin oxide) UME show current oscillations rather than discrete current step observed with Pt UME. Further, the collisions of dye-sensitized TiO2 NPs (DSNPs) at FTO show similar trend as in bare TiO 2 NPs, the magnitude of these oscillations are comparatively larger than those of bare TiO2 NPs. The addition of iodide into the DSNP colloidal suspension did not result in increasing the size of the PEC current oscillations at FTO, as expected based on NPs film behavior. The electrochemical studies of iodide at FTO provide evidence of electrochemical generation of iodine atoms (I*) at FTO. Nitrone spin trapping agents, DMPO (5,5-Dimethyl-1-pyrroline N-oxide) and TMPO (3,3,5,5-Tetramethyl-1-pyrroline N-oxide) were used to investigate the formation of this unstable radical and in the electron paramagnetic resonance (EPR) spectrum the radical intermediates of DMPO and TMPO were observed. The GCMS (gas chromatography-mass spectrometry) analysis of the electrolyte after long term electrolysis of tetrabutyleammonium iodide (TBAI) in acetonitrile is consistent with the formation of I* during the electrolysis process of I- at FTO.
590 $a School code: 0139.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0494
690 $a 0488
710 2 $a University of Nevada, Reno. $b Chemistry. $3 1030667
773 0 $t Dissertation Abstracts International $g 75-05B(E).
790 $a 0139
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3608768