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Large tuning of Surface Plasmon Resonance of Au-fullerene nanocomposite
Ritu Vishnoi,Satakshi Gupta,Ganesh D. Sharma,Rahul Singhal 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
Gold–fullerene C 60 nanocomposite thin fi lms prepared by thermal co-deposition were irradiated by a high energy beam of120 MeV Ag ions using Pelletron accelerator. Absorption spectra revealed a large and progressive tuning of surface plasmonresonance wavelength when the fi lms were irradiated at higher fl uences. This blue shift (~ 119 nm) can be ascribed to theevolution of fullerene into amorphous carbon upon bombardment of high energy ions at higher fl uences and causes a shiftin refractive index of the matrix. Raman spectra ascertained this transformation with the presence of two bands: D and Gband. Ion irradiation also leads to the formation of bigger size Au nanoparticles with well defi ned spherical shape at higherfl uences as confi rmed by TEM. XRD results demonstrated decrease in FWHM of diff raction peaks indicating the increasein particle size which is in agreement with the result obtained from TEM analysis.
Supratim Mitra,Satakshi Gupta,Aneesh M. Joseph,Umesh Kumar Dwivedi 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.2
An attempt has been made to synthesize (Ca 0.4 Sr 0.6 )Bi 4 Ti 4 O 15 (CSBT) thin fi lm using pulsed laser deposition method andsuccessfully optimized the deposition conditions. Film with the desired phase was obtained at a substrate temperature 650 °Cbased on phase and morphology studies using vast analytical techniques. The average thickness and grain size of as preparedfi lm was found to be in the range of 330–400 nm and 40–65 nm. Piezoresponse force microscopy showed a completedomain reversal using switching spectroscopy. A comparatively high eff ective d *3 3 value as ~ 120 pm/V has been achieved. These results suggest that CSBT has a great future potential in electromechanical applications specially in high-temperaturesensors and actuators.