Deconvolution of the Lorentzian Linewidth and Determination of Fraction Lorentzian Character from the Observed Profile of a Raman Line by a Comparison Technique

Asthana, B. P.; Kiefer, W.

doi:10.1366/0003702824638647

Cited by 68 publications

(85 citation statements)

References 13 publications

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“…From the obtained data, the maximum values of DOD and CE (32.36 cm 2 /C) in the T sub =400 o C. Therefore, this temperature is the optimum spray temperature. Results confirm the results of other works [13,25]. Also, the CE was calculated as a function SM.…”

Section: Evaluation Of Colouration Efficiencysupporting

confidence: 89%

Influence of Growth Conditions on the Electrochromic Efficiency and the Energy Band Gap of Iridium Oxide Thin Films.

Akl¹,

MSalman²,

Kashita³

2017

IJAR

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In the present research, work has been focused on the efficiency of electrochromic properties and energy gap of Ir-oxide thin films as a function of preparative parameters. IrO 2 thin films were deposited onto preheated indium tin oxide (ITO) coated glass substrates by cost effective chemical spray pyrolysis technique (SPT) at different substrate temperature (T sub ) and solution molarity (SM). Electrochromic characteristic of IrO 2 thin films was studied in aqueous electrolyte of 0.1M H 2 SO 4 . The optimum potential difference of coloration and bleaching state at +1.2 and -1.2V, respectively. The results show that, the best value of electrochromic efficiency (CE) and the optical density difference (DOD) λ=630nm were obtained at the conditions of preparation of 400 o C and solution molarity of 0.01M. IrO 2 thin films were found to have a direct transition allowed. The value of energy gap ( …………………………………………………………………………………………………….... Introduction:-The electrochromic process is defined as the material's ability to undergo electrochemical driven reversible light absorption changes [1,2]. Depending on the wavelengths absorbed, the phenomenon of electrochromic can be divided into two types: the visible type that occurs in the range of 350nm to 850nm and the other invisible type that occurs in the range smaller than 350nm and in the range greater than 850nm. The materials that possess this characteristic are the metal transition oxides such as tungsten, nickel, vanadium, etc., which are divided into two basic types of polarization, one of which is anodic and the other is cathodic. Iridium oxide (IrO 2 ) is one of them, an anodic electrochromic material, which is able to change the color from transparent to bluish-black in positive potential and is bleached inversely when negative potential is applied [3]. The study of the physical properties of iridium oxide is important for many applications such as the optical information storage [4], catalyst for the

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Section: Evaluation Of Colouration Efficiencysupporting

confidence: 89%

Influence of Growth Conditions on the Electrochromic Efficiency and the Energy Band Gap of Iridium Oxide Thin Films.

Akl¹,

MSalman²,

Kashita³

2017

IJAR

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“…Although the fitting is done by taking the sum of Lorentzian and Gaussian line shapes, a judicious mixture of the two profiles is nearly as good as a Voigt profile. [31] Since we face much larger diameters for the outer tubes for typical MWCNT samples with most samples consisting of an ensemble of nanotubes with different diameters, the characteristic spectral differences that distinguish Raman spectra of SWCNTs from those of graphite are not so evident for MWCNTs. As there are different MWCNT varieties that have not been well investigated up to now, some new features were expected to be observed in the Raman spectra of the especially prepared MWCNT filter variety.…”

Section: Raman G-bandmentioning

confidence: 98%

Characterisation of carbonaceous materials using Raman spectroscopy: a comparison of carbon nanotube filters, single‐ and multi‐walled nanotubes, graphitised porous carbon and graphite

Heise

Kuckuk

Ojha

et al. 2008

J Raman Spectroscopy

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158

103

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Multi-walledcarbon nanotube (MWCNT) filters have been recentlysynthesisedwhich have specificmolecular filteringcapabilities and good mechanical strength. Optical and scanning electron microscopy (SEM) reveals the formation of highly aligned arrays of bundles of carbon nanotubes having lengths up to 500 µm. The Raman spectra of this material along with four other carbonaceous materials, commercially available single-walled carbon nanotubes (SWCNTs) and MWCNTs, graphitised porous carbon (Carbotrap) and graphite have been recorded using two-excitation wavelengths, 532 and 785 nm, and analysed for band positions and shape with special emphasis paid to the D-, G-and G -bands. A major difference between the different MWCNT varieties analysed is that G-bands in the MWCNT filters exhibit almost no dispersion, whereas the other MWCNTs show a noticeable dispersive behaviour with a change in the excitation wavelength. Spectral features similar to those of the MWCNTfilter varieties were observed for the Carbotrap material. From the line shape analysis, the intensity ratio, I D /I G , of the more ordered MWCNT filter material using the integral G-band turns out to be two times lower than that of the less ordered MWCNT filter product at both excitation wavelengths. This parameter can, therefore, be used as a measure of the degree of MWCNT alignment in filter varieties, which is well supported also by our SEM study.

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“…The spectra for neat Acr and binary mixtures with low dilution (up to C = 0.6) were fitted taking two Voigt profiles [45,46] and using curve-fitting program Spectra Calc., which is specially suited for the analysis of Raman line profiles in order to get its multiple components. During the fitting of the Raman line profiles, each component was assumed to be a mixture of a Lorentzian and a Gaussian profile, which is essentially as good as a Voigt profile [45]. There is a slight asymmetry towards the lower wavenumber side of the m(C"N) stretching band for neat Acr as evident from the uppermost spectra in Figs.…”

Section: Raman Spectra Of Acrylonitrile In Methanol (M) and Ethanol (E)mentioning

confidence: 99%

Clusters of acrylonitrile in methanol/ethanol: A structure–spectra correlation by quantum chemical and polarized Raman study

2011

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Deconvolution of the Lorentzian Linewidth and Determination of Fraction Lorentzian Character from the Observed Profile of a Raman Line by a Comparison Technique

Cited by 68 publications

References 13 publications

Influence of Growth Conditions on the Electrochromic Efficiency and the Energy Band Gap of Iridium Oxide Thin Films.

Influence of Growth Conditions on the Electrochromic Efficiency and the Energy Band Gap of Iridium Oxide Thin Films.

Characterisation of carbonaceous materials using Raman spectroscopy: a comparison of carbon nanotube filters, single‐ and multi‐walled nanotubes, graphitised porous carbon and graphite

Clusters of acrylonitrile in methanol/ethanol: A structure–spectra correlation by quantum chemical and polarized Raman study

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