Electrochemical and spectral studies of self-assembled monolayer of 1,8,15,22-tetraaminophthalocyanatocobalt(II) on indium tin oxide surface

Sivanesan, Arumugam; John, S. Abraham

doi:10.1016/j.jelechem.2009.07.008

Cited by 4 publications

(4 citation statements)

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“…The compound which satises our needs to quantify the SSEF based on the renewed approach is 1,8,15,22-tetraaminophthalocyanatocobalt(II) (4a-Co II TAPc). It forms a very stable monomolecular lm on GC, 26 Au, 27,28 Ag 27 and indium tin oxide (ITO) 29 surfaces. 4a-Co II TAPc is a very good electro-active molecule which demonstrates a well-dened redox peak for the Co II /Co III redox couple.…”

Section: Overview Of the Renewed Approachmentioning

confidence: 99%

“…19,28 In addition, 4a-Co II TAPc shows a very strong absorption band, known as Q band, around 750 nm in UV-visible spectroscopy. 29 Now comes the issue of the Raman cross-section, a critical point which has to be addressed. In fact, the key assumption in the present approach is that, identifying the Raman crosssection of the probe molecule is not necessary (see Section 4 for details) since in both the RRS and SERRS experiments, the chromophore (4a-Co II TAPc) is under resonant conditions.…”

Section: Overview Of the Renewed Approachmentioning

confidence: 99%

“…Moreover, it forms a stable monomolecular lm on GC, Au, Ag and indium tin oxide (ITO). 26,28,29 3.2. Preparation, characterization and estimation of the real surface area of the SERS substrates…”

Section: Overview Of the Renewed Approachmentioning

confidence: 99%

“…The ability of 4a-Co II TAPc to form the monomolecular lm on GC and GC/Au surfaces, via chemisorptions, and subsequent precise quantication of its surface coverage by the cyclic voltammetry method is well documented in the literature. 26,28,29 Since the real surface area of both the surfaces (GC and GC/Au) has now been identied (see Section 3.2), the surface coverage of the 4a-Co II TAPc monomolecular lm on GC (G RRS ) and GC/ Au (G SERRS ) surfaces can also be quantied by integrating the charge under redox waves of the obtained cyclic voltammogram shown in Fig. 2.…”

Section: Estimation Of Surface Coverage Of 4a-co II Tapc On Both Gc A...mentioning

confidence: 99%

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Towards improved precision in the quantification of surface-enhanced Raman scattering (SERS) enhancement factors: a renewed approach

Sivanesan

Adamkiewicz

Kalaivani

et al. 2015

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This paper demonstrates a renewed procedure for the quantification of surface-enhanced Raman scattering (SERS) enhancement factors with improved precision. The principle of this method relies on deducting the resonance Raman scattering (RRS) contribution from surface-enhanced resonance Raman scattering (SERRS) to end up with the surface enhancement (SERS) effect alone. We employed 1,8,15,22-tetraaminophthalocyanato-cobalt(II) (4α-Co(II)TAPc), a resonance Raman- and electrochemically redox-active chromophore, as a probe molecule for RRS and SERRS experiments. The number of 4α-Co(II)TAPc molecules contributing to RRS and SERRS phenomena on plasmon inactive glassy carbon (GC) and plasmon active GC/Au surfaces, respectively, has been precisely estimated by cyclic voltammetry experiments. Furthermore, the SERS substrate enhancement factor (SSEF) quantified by our approach is compared with the traditionally employed methods. We also demonstrate that the present approach of SSEF quantification can be applied for any kind of different SERS substrates by choosing an appropriate laser line and probe molecule.

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Section: Overview Of the Renewed Approachmentioning

confidence: 99%