Crystal shape engineering and studies on the performance of vapour deposited InSe platelets

Teena, M.; Kunjomana, A. G.

doi:10.1007/s10854-018-8522-5

Cited by 2 publications

(5 citation statements)

References 27 publications

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“…1(c)]. A similar kind of microfiber was observed in physical-vapor-deposited InSe crystals (Teena & Kunjomana, 2018). The particular feature of interest of the asgrown Sb 2 Se 3 fibers is impeded growth with fast crystallization along the c axis, inhibiting growth along the other two directions because the side faces are of low energy, exhibiting a stable configuration.…”

Section: Resultsmentioning

confidence: 58%

“…1( f ). Nanocrystallization with polyhedral morphology was thermodynamically facilitated by the kinetic factor Gibbs free energy as a function of ÁT, according to the expression (Teena & Kunjomana, 2018;Pamplin, 1975) research papers…”

Section: Resultsmentioning

confidence: 99%

“…When ÁT was reduced to 60 K, the mass transfer was restricted, facilitating a decrease in Á proportionate to the concentration gradient. Hence, nanospheres were formed with minimal change in free energy, compared to other geometrical shapes (Teena & Kunjomana, 2018;Sunagawa, 2005). The typical equilibrium morphology was thus determined by the restricted mass transfer from the host stoichiometric charge with a decrease in T N (903 K).…”

Section: áG ¼ àmentioning

confidence: 99%

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Facile synthesis of novel antimony selenide nanocrystals with hierarchical architecture by physical vapor deposition technique

Bibin

Kunjomana

2019

J Appl Cryst

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Stoichiometric antimony selenide (Sb 2 Se 3 ) nanocrystals have been successfully engineered by a facile physical vapor deposition method, employing a single precursor of polycrystalline Sb 2 Se 3 charge in a closed quartz ampoule under high vacuum without any foreign seed or extraneous chemical elements. This work underscores the efficacy of the vapor deposition process and provides synthetic strategies to scale down bulk Sb 2 Se 3 into novel nanostructures. The morphological evolution of the tailored architecture was examined on micro and nano size scales by scanning electron microscopy and high-resolution transmission electron microscopy. The intrinsic mechanism governing the nanostructure formation is revealed as layer-by-layer growth, related to the unique layered structure of Sb 2 Se 3 . The optical properties of the grown crystals were probed by UV-vis-NIR and photoluminescence tools. The band-gap values of the microfibers, nanorods, nanooctahedra and nanospheres estimated from UV-vis-NIR analysis are found to be 1.25, 1.47, 1.51 and 1.75 eV, respectively. Powder X-ray diffraction, energy-dispersive analysis by X-rays, X-ray photoelectron spectroscopy, Raman spectroscopy and photoluminescence studies confirmed the quality, phase purity and homogeneity of the as-grown nanostructures. The adopted physical vapor deposition method is thus shown to be a simple and elegant route which resulted in the enhancement of the band gap for the Sb 2 Se 3 samples compared with their counterparts grown by chemical methods. This approach has great potential for further applications in optoelectronics.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: áG ¼ àmentioning

confidence: 99%

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Facile synthesis of novel antimony selenide nanocrystals with hierarchical architecture by physical vapor deposition technique

Bibin

Kunjomana

2019

J Appl Cryst

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“…Note that the crystallization peaks occasionally exhibit an irregular shape, which is a consequence of the sample stacking; as shown by the repeated measurements, the position of the peaks remains unchanged regardless of the shape. The melting of InSe occurs at ∼611 °C, i.e., outside of the standard DSC measurement range.…”

Section: Resultsmentioning

confidence: 99%

“…The q + dependence of the characteristic temperatures (glass-transition temperature T g , maximum of the first crystallization peak T c1 , maximum of the second crystallization peak T c2 , and melting temperature T m ) evaluated for the InSe films deposited on the Kapton foil are depicted in Figure C. Note that the two dependences shown for each of the crystallization peaks correspond to the lower and upper limits obtained within the set of films with different d f s. The higher thermal stability of the amorphous phase, i.e., the higher T c1 value, is generally found in InSe films with lower d f .…”

Section: Resultsmentioning

confidence: 99%

Formation of 2D-Structured InSe Ceramics from Amorphous Phase Deposited on a Kapton Foil

et al. 2023

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The formation kinetics of the 2D-layered InSe crystalline phase in thin amorphous InSe films was studied by means of differential scanning calorimetry, Raman spectroscopy, X-ray diffraction analysis, and X-ray absorption spectroscopy. All measurements were performed on as-deposited films (thicknesses ranging between 200 and 1500 nm), with Kapton foil used as a substrate. In the films with thickness ≥ 1000 nm, the formation was found to proceed via two steps: the exothermic reorganization of the amorphous phase (activation energy of 420 kJ•mol −1 ), followed by the exothermic formation of the crystalline phase (activation energy of 227 kJ•mol −1 ). For InSe films with thickness ≤ 500 nm, the two processes merged, but their reaction mechanism was still found to consist of two sequential phase transformations, with the reorganization in the amorphous phase being the necessary preliminary step. Both kinetic processes were found to be slowed down by the presence of mechanical defects and by the surface/interface imperfections. The possibility of two-step preparation of ideally layered flexible 2D InSe ceramics is suggested based on the separated hightemperature amorphous phase reorganization, followed by a low-temperature crystal growth step (during which excellent 2D InSe layering could be achieved).

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Crystal shape engineering and studies on the performance of vapour deposited InSe platelets

Cited by 2 publications

References 27 publications

Facile synthesis of novel antimony selenide nanocrystals with hierarchical architecture by physical vapor deposition technique

Facile synthesis of novel antimony selenide nanocrystals with hierarchical architecture by physical vapor deposition technique

Formation of 2D-Structured InSe Ceramics from Amorphous Phase Deposited on a Kapton Foil

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