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Tuning infrared absorption in hyperbolic polaritons coated silk fibril composite

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Chinese Physics B 2022年第11期31卷 381-387页

作者： Lihong Shi Jiebin Peng School of Science JiangNan UniversityWuxi 214122China School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou 510006China

Advanced textiles for thermal management give rise to many functional applications and unveil a new frontier for the study of human thermal *** the coated quasi-particles between the composite components offers a platform to study the advanced thermoregulatory ***,we propose that coating the hyperbolic polariton can be an effective tool to tune infrared absorption in hexagonal boron nitride-coated silk ***,we achieve significant tuning of the infrared absorption efficiency of silk fibrils through the designed hexagonal boron nitride *** underlying mechanism is related to resonance coupling between hyperbolic phonon *** find a notably high infrared absorption efficiency,nearly 3 orders larger than that without hBN coating,which can be achieved in our composite *** results indicate the promising future of advanced polariton-coated textiles and open a pathway to guide the artificial-intelligence design of advanced functional textiles.

关键词： thermal radiation thermal management infrared absorption hyperbolic polaritons

Residual compressive stress and intensity of infrared absorption of cubic BN films prepared by plasma enhanced chemical vapor deposition

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Chinese Physics B 2014年第3期23卷 475-481页

作者：杨杭生金盼盼徐亚伯李海洋 State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Department of Physics Zhejiang University

Theoretical and experimental investigations on the dependence of the intensity of infrared （IR） absorption of poly- crystalline cubic boron nitride thin films under the residual compressive stress conditions have been performed. Our results indicate that the intensity of the IR absorption is proportional to the total degree of freedom of all the ions in the ordered regions. The reduction of interstitial Ar atom concentration, which causes the increase in the ordered regions of cubic boron nitride （cBN） crystallites, could be one cause for the increase in the intensity of IR absorption after residual compressive stress relaxation. Theoretical derivation is in good agreement with the experimental results concerning the IR absorption intensity and the Ar interstitial atom concentration in cubic boron nitride films measured by energy dispersion X-ray spec- troscopy. Our results also suggest that the interstitial Ar is the origin of residual compressive stress accumulation in plasma enhanced cBN film deposition.

关键词： infrared absorption compressive stress degree of freedom interstitial atom

Magnetism, Electronic Transport and infrared absorption Spectra in Perovskite Manganite La_(0.67-x)Dy_xCa_(0.33)MnO_3 (x=0～0.6)

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Journal of Rare Earths 2007年第S1期25卷 207-210页

作者：曹晓明卢遵铭陈红建李养贤 School of Material Science and Engineering Hebei University of Technology Hebei Tiangong Chemical Machines Manufacture Co. Ltd

Polycrystalline samples La0.67-xDyxCa0.3MnO3 (x=0～0.6) were prepared by traditional solid-state reaction method. The magnetization and resistivity of the samples were measured by PPMS (Quantum Design). The infrared absorption spectra (temperature scope: 20～300 K, frequency: 400～4400 cm-1) were collected by WQF-410 Fourier Transform Spectrophotometer. The substitution of Dy on La sites results in a decrease of the Curie temperature Tc and the magnetization, and also induces cluster-glass behaviors. The resistivity of the compounds is enhanced by Dy doped. infrared absorption spectra provide the evidence of the variety of Mn-O-Mn bond length due to the Dy substitution and temperature changing. These results suggest that all of the magnetic coupling between Dy and Mn sublattice and La-Dy average ionic radius contribute to the magnetic and electronic character.

关键词： perovskite spin glass infrared absorption rare earths

Calculation of the infrared absorption for MX Compounds

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Semiconductor Photonics and Technology 2003年第2期9卷 99-101页

作者： ZHANGLu-yin QUShi-ming ShandongUniversityofScienceandTechology Tai‘an271021CHN Dept.ofPhys NormalCollegeofQingdaoUniverisytQingdao266071CHN

In the theory calculation of lattice vibration, one acoustic and three optical branches were found to compose the phonon vibrating *** isolated modes with frequencies lying outside the continuum branches will arise under the defect *** local model results in the sharp peaks in the infrared absorption and Raman *** calculation of the infrared absorption,the local mode with the infrared activity is obtained in the infrared absorption spectrum of MX compounds.

关键词： MX compounds infrared absorption calculation

infrared absorption and [CuO_5] Pyramid of High T_c Superconductor Bi-Sb-Sr-Ca-Cu-O System

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Journal of Beijing Institute of Technology 1996年第1期5卷 63-67页

作者：宋桂兰朱正芳白培光北京理工大学光电工程系内蒙古大学物理系

The infrared absorption spectra of different superconducting phase of high Tc super conductor Bi-Sb-Sr-Ca-Cu-O have been measured . The results show that only in the range of 400cm-1 -700cm-1,there is a group of peaks which changes with different superconducting *** to group theory and infrared spectra of CuO, this group of peaks could be assigned to be the [CuO6]octahedron, the [CuO5] pyramid and the [CuO4]plane quadrilateral,but not CU-O plane or CU-O chain. Furthermore, the quasi-three dimensional Cu-O layers consisting of [CuO5] pyramids and proper coupling between them are essential factor for high Tc. It seems that the weaker compling of layers, the higher Tc

关键词： infrared absorption high temperature superconductivity [CuO_5] pyramid structure

Methane concentration detection system based on differential infrared absorption

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Journal of Measurement Science and Instrumentation 2015年第2期6卷 193-196页

作者：宋林丽中北大学信息与通信工程学院山西太原030051

The infrared absorption method for methane concentration detection is an ideal way to detect methane at present. However, it is difficult to spread this method due to its high cost. In this paper, by using a wideband infrared light emitting di- ode （LED） accompanied with a PIN photo electric diode, a low-cost methane detection system was designed. To overcome the shortcomings caused by the wide working band, a differential light path was designed. By means of a differential ratio algo- rithm, the stability and the accuracy of the system were guaranteed. Finally, the validity of the system with the proposed algo- rithm was verified by the experiment results.

关键词： methane detection infrared absorption differential light path differential ratio algorithm

First-principles Study on infrared absorptions of Transition Metal-doped ZnO with Oxygen Vacancy

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 467-472页

作者： Yinhua YAO Quanxi CAO School of Technical Physics Xidian University

Using first-principle theory, the infrared absorptions of transition metal （Mn, Fe, Co, Ni）-doped ZnO were investigated. The results indicate that the absorptions of Mn- and Co-incorporated ZnO without oxygen vacancy are reduced, while those of Fe- and Ni-doped ZnO are raised. This is consistent with the previous experimental results. The effects of oxygen vacancy on the absorptions of the doped systems were predicted. When a neutral oxygen vacancy is introduced, all doping elements decrease the absorptions. On the contrary, the absorptions of the doped systems are enhanced if the vacancies are charged. Degraded absorptions can be obtained by increasing the permeability. However, the appearance of anti-bonding states may cause enhanced absorptions. In the current study, Mn-doped ZnO is the most suitable for use as low infrared absorption materials.

关键词： infrared absorption Oxygen vacancy ZnO Transition metal

Vibrational Energy—Spectra and Infraned absorption of α—Helical Protein Molecules

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Chinese Physics Letters 2002年第8期19卷 1096-1099页

作者：庞晓峰陈相容 InstituteofLifeScienceandTechnology UniversityofElectronicScienceandTechnologyofChinaChengdu610054 InstituteofAtomicandMolecularPhysics SichuanUniversityChengdu610065

The quantum energy spectra, including high excited states, of vibrational amide-I or of intramolecular excitations in α-helical protein molecules, are calculated by the discrete nonlinear Schrödinger equation together with the parameters appropriate to the systems. The distribution of energy levels obtained is basically consistent with the experimental values obtained by infrared absorption and Raman scattering. Utilizing the energy spectra we explain the laser Raman spectrum from metabolically active escherichia coli and we present some further features of the infrared absorption of the protein molecules.

关键词： infrared absorption

Determination of spin-orbit splitting Δ_0 of valence band at Γ for gallium phosphide nanoparticles using fluorescence and infrared spectroscopes

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Rare Metals 2011年第5期30卷 510-515页

作者： ZHANG Zhaochun LI Jianlin School of Material Science and Technology Shanghai University Shanghai 200072 China

The value of spin-orbit splitting Δ 0 of gallium phosphide （GaP） nanoparticles was determined. The information concerning the spin-orbit splitting of the valence band at Γ was acquired using fluorescence and infrared spectroscopes. Detailed investigation on the fluorescence characteristics under ultraviolet photoexcitation reveals that two doublets of emission transitions are related to the spin-orbit splitting of the valence band. The origin of two broad violet emissions, 3.00 and 3.10 eV, can be attributed to the direct transitions near the Γ point of the Brillouin zone between the Γ 1 conduction band and Γ 15 valance band, that is, Γ 6c –Γ 8v and Γ 6c –Γ 7v , respectively. The origin of two blue emissions, 2.74 and 2.64 eV, can be attributed to the indirect transitions between the X 1 conduction band and Γ 15 valance band, that is, Δ 5c –Γ 8v and Δ 5c –Γ 7v , respectively. Based on these transitions, the spin-orbit splitting Δ 0 of the GaP nanoparticles is determined as 0.10 eV. The infrared spectrum of the GaP nanoparticles shows a band at 817 cm -1 which is assigned to the transition between the Γ 7v and Γ 8v valence band maxima. It follows therefore that the spin-orbit splitting Δ 0 is 0.10 eV.

关键词： spin-orbit splitting nanoparticles gallium phosphide fluorescence infrared absorption