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Nioradze, Nikoloz (2010) DEVELOPMENT OF NANOFABRICATED PROBES FOR SCANNING ELECTROCHEMICAL MICROSCOPY. Master's Thesis, University of Pittsburgh. (Unpublished)

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ABSTRACTNikoloz Nioradze, MSUniversity of Pittsburgh 2009The work describes development of novel Pt disk electrodes with nanometer diameters using focused ion beam (FIB) milling. The nanofabricated electrodes are applied as probes of scanning electrochemical microscopy (SECM) for studying of electrochemical processes on redox reactive substrates. Nanotips are fabricated by pulling a platinum wire sealed in a glass capillary using a laser pipette puller. An inlaid platinum disk eventually is exposed by milling the tip of a pulled capillary by FIB. Electrodes are as small as 300-500 nm in diameter with a ratio of insulating glass sheath and Pt wire (RG) as small as 3. Moreover, FIB milling gives a flat tip surface. The small RG and smooth surface are helpful for approaching a probe close to a substrate in SECM feedback experiments. Nanometer-sized electrodes can be readily positioned within 100 nm from a polished platinum surface. After placing the tip close to the Pt disk, a potential of the Pt substrate is swept to drive a redox reaction, which is monitored as a current response at the nanometer-sized electrode. Presented method of combination of SECM and substrate cyclic voltammetry (CV) will allow for accurate extraction of electrochemical kinetic parameters of a redox reaction. Overall, it can be concluded that tips fabricated by presented method can be successfully exploited for SECM experiments. Described SECM-substrate CV approach will be useful for monitoring of electrochemical behavior of different conductive substrates.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Nioradze, Nikoloznzn1@pitt.eduNZN1
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAmemiya, Shigeruamemiya@pitt.eduAMEMIYA
Committee MemberMichael, Adrianamichael@pitt.eduAMICHAEL
Committee MemberWaldeck, Daviddave@pitt.eduDAVE
Date: 20 September 2010
Date Type: Completion
Defense Date: 24 November 2009
Approval Date: 20 September 2010
Submission Date: 13 July 2010
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: mass transport rates; steady-state diffusion profiles
Other ID:, etd-07132010-181621
Date Deposited: 10 Nov 2011 19:51
Last Modified: 15 Nov 2016 13:45


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