المؤلفون: Muhildharani, E., Saranya, K., Raja, C. Ramachandra

المصدر: Journal of Materials Science: Materials in Electronics; Jun2024, Vol. 35 Issue 17, p1-10, 10p

مستخلص: An organic single crystal of cytosinium succinate (CS) has been synthesized by slow evaporation technique at ambient temperature. Single-crystal X-ray diffraction study reveals that CS crystal has monoclinic crystal system with centrosymmetric space group C2/c. Powder X-ray diffraction method establishes the crystallinity of CS. UV–Vis-NIR study shows that CS has high transmittance in the visible and NIR portion having a cut-off wavelength of 194 nm. Infrared and Raman spectra reveals the vibrational characteristics of functional groups of CS crystal. Cytosinium cation and succinate anion are joined by N–H…O and O–H…O bonds which are well established in NMR analysis. The third-order NLO behaviour has been determined by Z-scan method. Third-order susceptibility (χ³) is evaluated as 1.231 × 10⁻⁷esu. The larger χ³ value of CS is due to the presence of hydrogen bonds within the structure. Photoluminescence study reveals the suitability of crystal for UV fluorescence detection, UV filter and optoelectronic devices. Thermogravimetric and differential thermal analysis facilitates the thermal behaviour of CS and establishes the crystal that is stable upto 135 °C The above-said properties of CS crystal allow it to explore its applications in optoelectronic devices, laser Q-switching and in night vision devices. [ABSTRACT FROM AUTHOR]

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المؤلفون: Deepa, P., Aarthi, R., Kalainathan, S., Raja, C. Ramachandra

المصدر: Journal of Electronic Materials; May2024, Vol. 53 Issue 5, p2333-2339, 7p

مصطلحات موضوعية: NONLINEAR analysis, POTASSIUM dihydrogen phosphate, NUCLEAR magnetic resonance, HYDROGEN bonding interactions, HYDROGEN, CRYSTALS, HYDROGEN plasmas

مستخلص: 4-Methylbenzylammonium hydrogen succinate (4MLBAHS) was synthesized and successfully grown via a slow solvent evaporation process. The structure was solved and the space group identified as P 1 ¯ . In the 4MLBAHS molecule, 4-methylbenzylammonium and hydrogen succinate are linked by O–H···O and N–H···O bonds. Functional group vibrations were revealed through vibrational analysis. UV–Vis–NIR analysis was used to determine the transparency bandwidth range from 260 nm to 1100 nm. ¹H and ¹³C nuclear magnetic resonance (NMR) spectroscopy established the carbon–hydrogen network in 4MLBAHS. In ¹H NMR, the chemical shift for the NH2 group of 4-methylbenzylamine was revealed at 1.42 ppm. This was shifted to 8.094 ppm in 4MLBAHS, owing to the origination of the N–H···O bond between the 4-methylbenzylammonium cation and hydrogen succinate anion. The third-order nonlinear optical characteristics were analysed using Z-scan analysis. χ³ was established as 3.0879 × 10⁻⁵ esu. The presence of hydrogen bond interactions in the 4MLBAHS crystal enhanced the χ³ value. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Electronic Materials is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Saranya, K., Muhildharani, E., Raja, C. Ramachandra

المصدر: Journal of Electronic Materials; May2024, Vol. 53 Issue 5, p2467-2476, 10p

مصطلحات موضوعية: SINGLE crystals, OXALATES, DIFFERENTIAL thermal analysis, X-ray powder diffraction, MOLECULAR structure, OPTICAL sensors, Q-switching

مستخلص: Isobutylammonium hydrogen oxalate hemihydrate (IHOH), an organic nonlinear optical (NLO) crystal, is developed in this work using a solvent evaporation process. The single-crystal XRD (SCXRD) study reveals the monoclinic system and centrosymmetric space group C2/c of IHOH. The highly crystalline nature of IHOH is confirmed by the presence of well-defined peaks in the powder x-ray diffraction (PXRD) pattern. The presence of various functional groups in IHOH is ascertained by vibrational analysis. The lower cutoff wavelength of IHOH is 223 nm, and it is transparent up to 1100 nm. The refractive index (n), extinction coefficient (k), optical absorption coefficient (α) and optical bandgap (Eg) are determined. Nuclear magnetic resonance (NMR) spectral analysis establishes the molecular structure of IHOH. Z-scanning is employed to analyse the NLO characteristics of IHOH crystal. The crystal demonstrates saturable absorption and a self-defocusing nature. The third-order NLO susceptibility (χ³) of IHOH is calculated as 2.6718 × 10⁻⁷ esu. The presence of N–H···O and O–H···O bonds in the IHOH crystal is the reason for the high χ³ value. The photoluminescence (PL) spectrum reveals violet and blue emission from the crystal. The decomposition of IHOH is investigated using thermogravimetry/differential thermal analysis (TG/DTA analysis. The results reveal the suitability of IHOH for Q-switching, optical pulse shortening, optical sensors, and photonic and optoelectronic applications. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Electronic Materials is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Muhildharani, E., Saranya, K., Raja, C. Ramachandra

المصدر: Applied Physics A: Materials Science & Processing; Apr2024, Vol. 130 Issue 4, p1-10, 10p

مستخلص: Cytosinium dihydrogen phosphite (CDHP), a semiorganic crystal has been grown by slowly evaporating the solvent. It crystallizes in triclinic system with non-centrosymmetric space group P1. Optical transmittance study of CDHP shows its transmitting ability from 277 to 1100 nm. Fourier Transform Infrared and Raman spectral analysis establishes the vibrations of functional groups present in CDHP. Presence of H2PO3⁻ ion’s characteristic vibrations ensures the formation of CDHP crystal. Nuclear Magnetic Resonance (NMR) spectral analysis elucidates the proton and carbon environment and the molecular structure of CDHP has been confirmed. Second harmonic generation (SHG) efficiency has been measured using Kurtz and Perry powder method. SHG efficiency of CDHP is 0.88 times that of KDP. Photoluminescence emission spectrum suggests suitability of CDHP crystal to design UV fluorescence detection, UV filter and optoelectronic devices. The third order nonlinear optical (NLO) parameters have been analysed by Z-scan technique which reveals the self-defocusing and saturable absorption nature of CDHP. The third order NLO susceptibility (χ³) is determined as 1.0633 × 10^–7 esu. Presence of N–H…O and O–H…O hydrogen bonds in CDHP crystal is the reason for this high χ³ value. The results reveals that the crystal can be used in laser Q-switching, optical sensors and optoelectronic applications. Thermal stability of CDHP is analysed by thermogravimetric and differential thermal analysis (TG/DTA).Highlights: Single crystal of CDHP were grown from solution growth technique. CDHP has high optical transmittance and can be used for optoelectronic and harmonic generation applications. Vibrational analysis ensures the existence of H2PO3− anion. Molecular structure of CDHP was confirmed by NMR analysis. CDHP shows better SHG efficiency. Z scan analysis reveals CDHP to be a perfect material for designing optical sensors. [ABSTRACT FROM AUTHOR]

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المؤلفون: Deepa, P., Aarthi, R., Kalainathan, S., Raja, C. Ramachandra

المصدر: Optical & Quantum Electronics; Dec2023, Vol. 55 Issue 13, p1-22, 22p

مصطلحات موضوعية: MALEIC acid, NIGHT vision devices, OPTICAL limiting, NUCLEAR magnetic resonance spectroscopy, CRYSTAL structure, CRYSTALS

مستخلص: 4-Methylbenzylammonium hydrogen maleate (4MBAHM), a novel organic nonlinear optical single (NLO) crystal has been developed by solvent evaporation method at ambient temperature. The structure of the 4MBAHM crystal has been solved and it reveals monoclinic system and space group P21/c. FT-IR and FT-Raman analyses are carried out to ascertain the functional groups present in the crystal structure. Optical properties are determined by UV–Vis-NIR analysis. 4MBAHM crystal is transparent from 262 to 1100 nm. Proton and carbon environment have been identified using NMR spectroscopy. The NMR spectroscopy reveals the formation of N–H...O, O–H...O and C–H...O bonds between 4-methylbenzylammonium (C8H12N)⁺ cation and hydrogen maleate (C4H3O4)⁻ anion. The nonlinear optical parameters have been determined using Z-scan study. The third order NLO susceptibility (χ³) value is found to be 2.8975 × 10⁻⁵ esu. The closed aperture curve reveal 4MBAHM possess self-defocusing nature and the open aperture curve reveals reverse saturable absorption which find application in the field of night vision devices and optical limiting. [ABSTRACT FROM AUTHOR]

: Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Saranya, K., Muhildharani, E., Raja, C. Ramachandra

المصدر: Journal of Materials Science: Materials in Electronics ; volume 34, issue 7 ; ISSN 0957-4522 1573-482X

مصطلحات موضوعية: Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

الإتاحة: https://doi.org/10.1007/s10854-023-10118-1Test

المؤلفون: Saranya, K., Muhildharani, E., Raja, C. Ramachandra

المصدر: Journal of Materials Science: Materials in Electronics ; volume 34, issue 7 ; ISSN 0957-4522 1573-482X

مصطلحات موضوعية: Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

الإتاحة: https://doi.org/10.1007/s10854-023-10088-4Test

المؤلفون: Aarthi, R, Raja, C Ramachandra

المصدر: Bulletin of Materials Science ; volume 42, issue 5 ; ISSN 0250-4707 0973-7669

مصطلحات موضوعية: Mechanics of Materials, General Materials Science

الإتاحة: https://doi.org/10.1007/s12034-019-1903-4Test

المؤلفون: Ramya, K., Raja, C. Ramachandra

المصدر: Journal of Minerals and Materials Characterization and Engineering ; volume 04, issue 02, page 143-153 ; ISSN 2327-4077 2327-4085

الإتاحة: https://doi.org/10.4236/jmmce.2016.42014Test
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المؤلفون: Vigneshwaran, A.N., Joseph, A. Antony, Raja, C. Ramachandra

المساهمون: Council of Scientific and Industrial Research

المصدر: Optik ; volume 127, issue 13, page 5365-5369 ; ISSN 0030-4026

مصطلحات موضوعية: Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

الإتاحة: https://doi.org/10.1016/j.ijleo.2016.03.035Test
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