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082			_223 _aT 541.3724 _bC172p CD
092	0		_223 _aT 541.3724 _bC172p CD
100	1		_aCamacho Caraballo, Lynette Y. _9298370
245	1	0	_aPreparation, characterization, and electrochemical behavior of organothiols self-assembled monolayers on polycrystalline and thin films gold electrode surfaces / _h[electronic resource] _cby Lynette Y. Camacho Caraballo.
260			_c2021.
300			_a1 disco de computadora ([11], 123 hojas) ; _c4¾ pulgadas (11.5 centímetros)
336			_2rdacontent _btxt _atexto
337			_2rdamedia _bc _acomputer
338			_2rdacarrier _bcd _acomputer disc
502			_aThesis (Master in Science- Chemistry) -- Pontificia Universidad Católica de Puerto Rico, 2021.
504			_aBibliographical references : pages 112-117.
520	3		_aThe use of modified electrode surfaces, such as Self- Assembled Monolayers (SAM’s), can improve electron transfer in electrode-electrolyte surface. These monolayers have a great stability and are easy to prepare. This research is focused on electrochemical behavior study of an aromatic SAM’s of 4-aminothiophenol (4-ATP), which has not been widely studied. Cyclic Voltammetry (CV) is the electroanalytical technique used in this project to correlates current (i) with applied potential (V). CV serves as a fingerprint of the electrode surface. 4-ATP adsorbs spontaneously and forms a stable (in a certain range of potential) and reproducible monolayer at polycrystalline Au electrode. Stability, electrochemical oxidation and desorption process from homogeneous and oxidized mixed surface-confined adsorbed 4ATP SAM’s were studied. Results showed that adsorbed 4ATP was stable in potentials below 0.5V and electrochemical oxidation of this monolayer occurs at 0.7V. A different structure of the monolayer was formed after the electrochemical oxidation which generates two surface-confined redox pairs. By controlling the experimental procedures, it is possible to generate different oxidized mixed SAM’s. Differences in voltammetric responses related to the SAMs desorption processes show that different structures are adsorbed onto Au surface. Electrochemical redox-probes responses were used i) to demonstrate that SAM’s were adsorbed uniformly onto Au surface and ii) to differentiate electrode surface composition. Also, it is possible to prepare, and characterized thin film Au electrodes, from Au recycled fragments, that show preferentially oriented Au (111) domains. The electrochemical oxidation of adsorbed 4ATP was carry out at thin film Au electrodes which also generates two pair redox surface-confined products. Reductive desorption voltammetric responses were found for different monolayers of adsorbed 4ATP, suggesting that different structures are adsorbed on the Au surface. Changes in the supporting electrolyte can generate different electrochemical responses.3
538			_aDisc characteristics : CD-ROM.
538			_aSystem requirements : PC, CD-ROM reader and Adobe Acrobat Reader.
610	2	7	_9294920 _aPontificia Universidad Católica de Puerto Rico _xDissertations. _2Local
650		0	_9298371 _aMonomolecular films _xResearch _zPuerto Rico
650		0	_aElectrodes _xResearch _zPuerto Rico _9220138
710	2		_aPontificia Universidad Católica de Puerto Rico. _bColegio de Ciencias. _bDepartamento de Química _9294919
942			_2ddc _c3 _e23 _hT 541.3724 _iC172p _mCD _n0
999			_c296423 _d296423