THE PREPARATION AND CHARACTERISTICS STUDY OF TiN_xO_y SPECTRAL SELECTIVE ABSORBING FILM BY MAGNETRON SPUTTERING

Spectral selective absorbent film is a crucial factor for the solar heating devi ce. There are many kinds of spectral selective absorbing film made by different ways. TiNxOy thin film with excellent spectral selecting absobent property were successfully prepared by DC magnetron sputtering with Ar as working gas, N2 and O2 as reactive gas, 99.9% titanium as the target and is copper slice as the subs trate. In this article, the optical characteristics and microstructure of TiNxO y thin film were studied. Inputing O2 can decrease the reflection of the visible lights, and double layer film can get good absorption for solar energy.

Tunable dual-band terahertz graphene absorber with guided mode resonances

A tunable dual-band terahertz absorber is designed and investigated. The unit cell of the proposed absorber consists of a graphene monolayer on a guided-mode resonant filter. The graphene absorber presents > 40% absorption at two resonance frequencies, which is attributed to the guided mode resonances with different mode numbers. The electric field intensity distribution is analyzed to disclose the physical mechanism of such a dual-band absorption effect. Furthermore,the influence of optical properties of graphene, including Fermi level and relaxation time, on the absorption spectra are investigated. Finally, the influence of geometric parameters on the absorption spectrum is studied, which will provide useful guidance for the fabrication of this absorber. We believe that the results may be useful for developing the next-generation graphene-based optoelectronic devices.

Crystal Structure and Spectroscopic Analysis of Polyphenyl Quinoxaline with Hg(Ⅱ)

The interaction of Hg^2＋ with polyphenyl quinoxaline ligand 2,3,6,7,10,11-hexaphenyldipyrazino[2,3-f：2＇,3＇-h]quinoxaline（HPQ） was investigated, and a new complex（C（49）H（32）N6Br2Cl2Hg） has been synthesized and characterized. It exhibits a 0D single-core structure,and adopts triclinic P 1 space group with a = 11.139（2）, b = 13.429（3）, c = 14.488（3）A, α =76.10（3）, β = 83.16（3）, γ = 87.36（3）o, V = 2088.4（7） A^3, Z = 2, S = 1.056, F（000） = 1104, R = 0.0417 and w R = 0.0931（I 〉 2σ（I））. Furthermore, the behavior of HPQ with Hg^2＋ in the solution was also investigated, and the result shows that HPQ was found to have excellent fluorescent selectivity for Hg^2＋ over many other metal ions（Li^＋, K^＋, Na^＋, Sr^＋, Ca^2＋, Mg^2＋, Mn^2＋, Fe^3＋, Ni^2＋, Co^2＋, Cu^2＋, Zn^2＋,Cd^2＋, Pb^2＋, Al^3＋ and Cr^3＋） based on the intermolecular charge-transfer mechanism, which makes HPQ a potential fluorescence sensor or probe for Hg^2＋.

Energy saving analysis of a transparent radiative cooling film for buildings with roof glazing

A transparent radiative cooling(T-RC)film with low transmittance in solar spectra and selectively high emissivity in the atmospheric window(8-13𝜇m)is applied on roof glazing for building energy saving.To evaluate the per-formance of the T-RC film,two identical model boxes(1.0 m×0.6 m×1.2 m,L×W×H)were constructed and the inside air temperatures were measured in August in Ningbo,China.Results show that the maximum temperature difference between the two model boxes with and without the T-RC film was 21.6℃during the experiment.A whole building model was built in EnergyPlus for the model box.With a good agreement achieved between the calculation results and the measured temperature data,the experimentally validated EnergyPlus model was then extended to an 815.1 m^(2)exhibition building with roof glazing to analyze the annual air conditioning(AC)energy consumption.The results show that by incorporating both the T-RC film’s cooling benefit in summer and heating penalty in winter,the annual AC energy consumption of the exhibition building can be reduced by 40.9-63.4%,varying with different climate conditions.