Infrared band strengths for amorphous and crystalline methyl propionate, a candidate interstellar molecule

Hudson, R. L.; Mullikin, Ella

doi:10.1016/j.saa.2018.09.032

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…These sharp edges were suggested to indicate the crystallinity of these samples. 33 Since, for amorphous material, there is a variation in the frequency of the vibrational modes which gives broader peaks compared to crystalline films, suggests that the sp 2 -BN films grown on r-cut and m-cut Al 2 O 3 were amorphous. hich originate from sp 2 -BN (000ℓ) and sp 2 -BN (0002ℓ), respectively.…”

Section: A Chemical Bonding Statesmentioning

confidence: 99%

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (112¯), (11¯02), and (101¯) substrates

Sharma

Souqui

Pedersen

et al. 2022

Journal of Vacuum Science &Amp; Technology A

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Thin films of boron nitride in its sp2-hybridized form (sp2-BN) have potential uses in UV devices and dielectrics. Here, we explore chemical vapor deposition (CVD) of sp2-BN on various cuts of sapphire: Al2O3 [Formula: see text], Al2O3 [Formula: see text], Al2O3 [Formula: see text], and Al2O3 (0001) using two CVD processes with two different boron precursors triethylborane and trimethylborane. Fourier transform infrared spectroscopy shows that sp2-BN grows on all the sapphire substrates; using x-ray diffraction, 2θ/ω diffractogram shows that only Al2O3 [Formula: see text] and Al2O3 (0001) rendered crystalline films: and using phi(ϕ)-scans, growth of the rhombohedral polytype (r-BN) films on these substrates is confirmed. These films were found to be epitaxially grown on an AlN interlayer with comparatively higher crystalline quality for the films grown on the Al2O3 [Formula: see text] substrate, which is determined using omega(ω)-scans. Our study suggests that Al2O3 [Formula: see text] is the most favorable sapphire substrate to realize the envisioned applications of r-BN films.

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Section: A Chemical Bonding Statesmentioning

confidence: 99%

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (112¯), (11¯02), and (101¯) substrates

Sharma

Souqui

Pedersen

et al. 2022

Journal of Vacuum Science &Amp; Technology A

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“…These sharp edges are suggested to indicate the crystallinity of these samples. 28 Since, for amorphous material there is a variation in the frequency of the vibrational modes which gives broader peaks compared to crystalline films, suggesting that the sp 2 -BN films grown on r-cut and m-cut sapphire are amorphous. originate from sp 2 -BN (000ℓ) and sp 2 -BN (0002ℓ) respectively.…”

Section: B Film Characterizationmentioning

confidence: 99%

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (11𝟐0), (1𝟏02) and (10𝟏0) substrates

Sharma

Souqui

Pedersen

et al. 2021

Preprint

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Thin films of boron nitride in its sp2-hybridized form (sp2-BN) have potential use in UV-devices and dielectrics. Here, we explore chemical vapor deposition (CVD) of sp2-BN on various cuts of sapphire; Al2O3(112̅0), Al2O3(11̅02), Al2O3(11̅00) and Al2O3 (0001) using two CVD processes with different boron precursors; triethylborane (TEB) and trimethylborane (TMB). Fourier transform infrared spectroscopy (FTIR) showed that sp2-BN grows on all the sapphire substrates, using X-ray diffraction (XRD), 2θ/ω diffractograms showed that only Al2O3(112̅0) and Al2O3(0001) renders crystalline films and using phi(ɸ)-scans the growth of rhombohedral polytype (r-BN) films on these substrates is confirmed. These films are found to be epitaxially grown on an AlN interlayer with a higher crystalline quality for the films grown on the Al2O3(112̅0) substrate which is determined using omega(ω)-scans. Our study suggests that Al2O3(112̅0) is the most favorable sapphire substrate to realize the envisioned applications of r-BN films.

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“…Simultaneous studies of mixtures by various methods such as measurement of the refractive index (RI), Fourier transform infrared (FTIR) spectroscopy, and mass spectroscopy help us to understand the significance of the studied parameters of amorphous structures at low temperatures obtained in the experiment. Currently, various methods for studying the RI of a wide range of substances at low temperatures are described. , …”

Section: Introductionmentioning

confidence: 99%

“…Currently, various methods for studying the RI of a wide range of substances at low temperatures are described. 1,2 Cryovacuum condensates of organic substances, such as methane, methanol, ethanol, and freons, are prone to the formation of glassy states with their subsequent transformation with a change in temperature or pressure. Methanol is able to form various cluster structures due to intermolecular hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

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Infrared Analysis and Effect of Nitrogen and Nitrous Oxide on the Glass Transition of Methanol Cryofilms

et al. 2022

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Methanol plays an important role in studying the structure and dynamics of hydrogen bonds in alcohols and other physiologically important compounds in the condensed state. The physical vapor deposition method and two-beam interferometry make it possible to study the structure of polyatomic molecules, the nature and character of intermolecular interactions, and the internal structure of various compounds. Thus, it becomes possible to analyze changes in the internal structure of substances near the points of their phase transitions and glass transitions at ultralow temperatures. In this work, we have studied the effect of nitrogen and nitrous oxide on the dependence of refractive indices of methanol on temperature and on structural-phase transformations upon heating from 16 to 160 K.

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Infrared band strengths for amorphous and crystalline methyl propionate, a candidate interstellar molecule

Cited by 12 publications

References 30 publications

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (112¯), (11¯02), and (101¯) substrates

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (112¯), (11¯02), and (101¯) substrates

Chemical vapor deposition of sp2-boron nitride films on Al2O3 (0001), (11𝟐0), (1𝟏02) and (10𝟏0) substrates

Infrared Analysis and Effect of Nitrogen and Nitrous Oxide on the Glass Transition of Methanol Cryofilms

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