Peculiarities of near-room-temperature thermal-emission measurements using FTIR spectroscopy

2018 ◽  
Author(s):  
Yuzhe Xiao ◽  
Alireza Shahsafi ◽  
Patrick J. Roney ◽  
Chenghao Wan ◽  
Graham Joe ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Room Temperature ◽  
Thermal Emission

scholarly journals Materials for Future Quantum Dot-Based Memories

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
T. Nowozin ◽  
D. Bimberg ◽  
K. Daqrouq ◽  
M. N. Ajour ◽  
M. Awedh
Keyword(s):  
Cross Sections ◽  
Room Temperature ◽  
Storage Time ◽  
Thermal Emission ◽  
Current Status ◽  
Strong Electron ◽  
Self Organized ◽  
Hole Confinement ◽  
Storage Times ◽  
Capture Cross Sections

The present paper investigates the current status of the storage times in self-organized QDs, surveying a variety of heterostructures advantageous for strong electron and/or hole confinement. Experimental data for the electronic properties, such as localization energies and capture cross-sections, are listed. Based on the theory of thermal emission of carriers from QDs, we extrapolate the values for materials that would increase the storage time at room temperature to more than millions of years. For electron storage, GaSb/AlSb, GaN/AlN, and InAs/AlSb are proposed. For hole storage, GaSb/Al0.9Ga0.1As, GaSb/GaP, and GaSb/AlP are promising candidates.

DLTS studies of defects produced in n-type silicon by hydrogen implantation at low temperature

2002 ◽  
Vol 744 ◽  
Author(s):  
Takahide Sugiyama ◽  
Masayasu Ishiko ◽  
Shigeki Kanazawa ◽  
Yutaka Tokuda
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Room Temperature ◽  
Reverse Bias ◽  
Thermal Emission ◽  
Sample Temperature ◽  
Zero Bias ◽  
Type Silicon ◽  
Projected Range ◽  
Hydrogen Implantation

ABSTRACTMetastable defects are discovered in hydrogen-implanted n-type silicon. Hydrogen implantation was performed with the energy of 80 keV to a dose of 2×10 cm- at 109 K. After implantation, the sample temperature was raised to room temperature. DLTS measurements were carried out in the temperature range 80–290 K for fabricated diodes. When the sample is reverse-biased at 10V for 10 min at room temperature and then is cooled down to 80 K, three new peaks labeled EM1, EM2 and EM3 appear around 150, 190 and 240 K, respectively. The introduction of metastable defects is found to be characteristic of low temperature implantation. We have evaluated properties of EM1 in detail. EM1 with thermal emission activation energy of 0.29 eV has a peak in concentration around the depth of 0.64 μ m, which corresponds to the projected range of 80 keV hydrogen. EM1 is regenerated with the reverse bias applied around 270 K and is removed with the zero bias around 220 K.

Peculiarities of the energy spectrum of InSb/InAs/InGaAs/InAlAs/GaAs nanoheterostructures revealed by room temperature photomodulation FTIR spectroscopy

2019 ◽  
Vol 58 (5) ◽  
pp. 050923 ◽  
Author(s):  
Oleg S. Komkov ◽  
Dmitrii D. Firsov ◽  
Aleksey D. Andreev ◽  
Mikhail Yu. Chernov ◽  
Victor A. Solov’ev ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Ftir Spectroscopy ◽  
Room Temperature

Synthesis and characterization of single-crystal indium nitride nanowires

2004 ◽  
Vol 19 (2) ◽  
pp. 423-426 ◽  
Author(s):  
Tao Tang ◽  
Song Han ◽  
Wu Jin ◽  
Xiaolei Liu ◽  
Chao Li ◽  
...  
Keyword(s):  
Electronic Transport ◽  
Room Temperature ◽  
Thermal Emission ◽  
Indium Nitride ◽  
Chemical Vapor ◽  
Gold Clusters ◽  
Vapor Generation ◽  
Vapor Deposition Technique ◽  
Single Nanowires

InN nanowires were synthesized and characterized using a variety of techniques. A two-zone chemical vapor deposition technique was used to operate the vapor generation and the nanowire growth at differential temperatures, leading to high-quality single-crystalline nanowires and growth rates as high as 4–10 μm/h. Precise diameter control was achieved by using monodispersed gold clusters as the catalyst. Photoluminescence and Raman studies have been carried out for the InN nanowires at room temperature. Devices consisting of single nanowires have been fabricated to explore their electronic transport properties. The temperature dependence of the conductance revealed thermal emission as the dominating transport mechanism.

scholarly journals Influence of Erbium Ions on the Optical and Structural Properties of Polyvinyl Alcohol

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Taymour A. Hamdalla ◽  
Taha A. Hanafy ◽  
Ashraf E. Bekheet
Keyword(s):  
Refractive Index ◽  
Polyvinyl Alcohol ◽  
Aqueous Solutions ◽  
Ftir Spectroscopy ◽  
Room Temperature ◽  
Energy Gap ◽  
Optical Measurement ◽  
Optical Parameters ◽  
Erbium Ions ◽  
Erbium Chloride

Polyvinyl alcohol (PVA) films doped with erbium chloride (ErCl3) have been prepared by casting from their aqueous solutions. The structure of the doped samples as well as the interactions between the host PVA and Er+3was investigated using FTIR spectroscopy. The optical measurement was recorded at room temperature in the range from 200 nm to 2000 nm. FTIR measurements revealed that Er+3forms complex configuration within the PVA structure. PVA doped with 9 wt% of ErCl3exhibits energy gap and refractive index of 5.1 eV and 1.72, respectively. The effect of the doping increment of ErCl3on the optical parameters has been discussed.

Comparison of Polarities of Room-Temperature Ionic Liquids Using FT-IR Spectroscopic Probes

2005 ◽  
Vol 58 (5) ◽  
pp. 327 ◽  
Author(s):  
Guo-hong Tao ◽  
Ming Zou ◽  
Xiao-hua Wang ◽  
Zhi-yu Chen ◽  
David G. Evans ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Ionic Liquids ◽  
Ftir Spectroscopy ◽  
Room Temperature ◽  
General Type ◽  
Room Temperature Ionic Liquids ◽  
Spectroscopic Probes ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Solvent Properties

The solvent properties, especially the polarity, of room-temperature ionic liquids (RTILs) of the general type [Cnmim]X, where [Cnmim] is the 1-CnH2n+1-3-methylimidazolium cation and X is [BF4]−, [PF6]−, [NO3]−, [SCN]−, or [NTf2]− (Tf = CF3SO2), have been investigated using Fourier-transform infrared (FTIR) spectroscopy. Comparing the experimental shifts in the νC=O stretching frequencies of acetone and N,N-dimethylformamide (DMF) as probe molecules suggests that the polarities of most common RTILs are between that of DMF and methanol. A more sensitive probe, Fe(CO)5, can distinguish small polarity differences between RTILs with similar structures. The effects of varying the structure of RTILs by introducing functional groups and different anions on their polarity are also compared.

scholarly journals Comprehensive Investigation of Thermal Degradation Characteristics and Properties Changes of Plant Edible Oils by FTIR-Spectroscopy

2019 ◽  
Vol 27 (2) ◽  
pp. 263-286
Author(s):  
Fatos Rexhepi ◽  
Andriana Surleva ◽  
Arbër Hyseni ◽  
Melisa Bruçi ◽  
Blerina Kodraliu
Keyword(s):  
Ftir Spectroscopy ◽  
Room Temperature ◽  
Edible Oils ◽  
Fatty Acid Content ◽  
Thermal Heating ◽  
Degree Of Unsaturation ◽  
Absorbance Ratio ◽  
Initial Decrease ◽  
Specific Absorbance

Abstract Structural characterization of edible oils after thermal treatment was made by (FTIR) spectroscopy. Olive, corn and sunflower oil samples were thermally treated at three consecutive cycles. Each cycle consisted of heating at the boiling point for 8 h, followed by cooling at room temperature for 16 h. At the end of each cycle the characteristics of oils were studied by FTIR spectroscopy and standard methods. Study of FTIR spectra of the treated oils revealed that the heating of oils caused significant changes in the intensities of their bands and produced shifts in the position of specific bands such as 3008 cm−1 and 1745 cm−1. The level of oil oxidation during different heating period was followed by the absorbance ratio at 3530/3472 cm−1. Additionally, the absorbance ratio 2853/3008 cm−1 was used as a measure of degree of unsaturation. The thermal heating of oils produced an initial decrease in the specific absorbance ratios which could be attributed to the reduction of unsaturated fatty acid content due to oxidation process. The results in this study demonstrated that FTIR could be used for assessment of the state of oils by using specific absorbance ratios as indicators.

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