材料分析文獻(xiàn)報(bào)告

1、材料分析文獻(xiàn)報(bào)告（納米光子學(xué)中用到的材料測試方法） 姓名：陳義富 學(xué)號：157238242015.10.111.Optical properties of silver nano-cubes介紹金屬內(nèi)部與表面存在大量自由電子, 形成自由電子氣團(tuán), 即等離子體(plasmon); 而表面等離子體則特指存在于金屬表面的自由電子氣團(tuán). 當(dāng)入射光與金屬納米結(jié)構(gòu)表面自由電子氣團(tuán)的振動發(fā)生共振時就形成了表面等離子體共振(surface plasmon resonance,SPR)。金屬納米結(jié)構(gòu)的表面等離子體光學(xué)在光催化、光學(xué)傳感、生物標(biāo)記、醫(yī)學(xué)成像、太陽能電池, 以及表面增強(qiáng)拉曼光譜等領(lǐng)域有廣泛的應(yīng)用前景

2、, 這些功能也和金屬納米結(jié)構(gòu)與光相互作用時產(chǎn)生的表面等離子體共振密切相關(guān)。(a) 電場作用下金屬納米顆粒等離子體振蕩示意圖 (b) 電場作用下金屬-電介質(zhì)界面等離子體振蕩示意圖, 電場可以被局域在亞波長尺度內(nèi)Synthesis of silver nano-cubes Optical properties is an important property and signature of nanomaterials. Here the silver nano-cubes prepared by chemical reduction method. Silver nano-cubes have

3、been synthesized by reducing AgNO3 with ethylene glycol using poly (vinyl pyrrolidone) (PVP) as a stabilizing agent. Characterization analysisX-ray diffraction studies of the silver nano-cubes have been carried out X-ray diffractometer (XRD). Cu Ka X-rays of wavelength = 1.54056 . Size and morpholog

4、y of the silver nano-cubes have been obtained by transmission electron micro-scopy (TEM), operating at an accelerating voltage of 200 kV.(1).X-ray diffraction(XRD) analysisThe reflections are indexed as (111), (200) and (220) with thecorresponding 2h values of 38.013, 44.133and 64.104 respectively.A

5、ll the reflection peaks as obtained correspond to the pure silver metal with face centered cubic (fcc) symmetry. Average particle size has been calculated using Debye Scherrer formula: D = K/bCosh where K denotes the Scherrer constant (shape factor) and b is broadening of diffraction line measured a

6、t half of its maximum intensity (in radian); = 0.1541 nm is the wavelength of the incident Cu K-a radiation; and h is Bragg diffraction angle (in degree)，the calculation the average crystallite size of the silver nano-cubes is found to be 86 nm (approx). (A) TEM micrograph of silver nano-cubes, with

7、 (C) High resolution TEM image, (B) Particle size distribution histogram and (D) SAED pattern of silver nanocrystals(2).High Resolution Transmission Electron Microscopy(HRTEM)2.Effect of Ag shapes and surface compositions on the photocatalytic performance of Ag/Zno nanorodsLately, a growing interest

8、 on photocatalysis over semiconductor has been aroused for the treatment of wastewater and indoor air pollution.most researches focused on the influences of noble metal size and concentration on photocatalytic performance. However, the shape of noble metals was also an important factor which may aff

9、ect the SPR effect.XRD patterns of different samples. (a) ZnO; (b) 0.04AZP; (c) 0.06AZP; (d)0.08AZP; (e) 0.04AZH; (f) 0.06AZH; (g) 0.08AZH.XRD analysisP： Photoreduction；H： hydrothermal。 For all patterns, the primary diffraction peaks at 2h values of 31.72,33.42 and 36.28 corresponding to the (002),

10、(100), and (101)crystal planes of ZnO are clearly observed. The diffraction peak of ZnO at 2h = 33.42 is the strongest and sharpest among all peaks, which may be attributed to the epitaxy growth of ZnO nanorods along 001 direction. The other peaks in the XRD patterns of AZP and AZH samples are obser

11、ved due to the dispersion of Ag on ZnO nanorods surface. FESEM images of AZP and AZH samples. (a) 0.06AZP (low magnification); (b) 0.06AZP (high magnification); (c) 0.06AZH (low magnification); (d) 0.06AZH (highmagnification).TEM study3.Photodetection with Active Optical AntennasOptical antennas are

12、 key elements in the conversion of light from free space to ultrasmall, nanometer-scale volumes.4.Narrow-Linewidth and High-Transmission Terahertz Bandpass Filtering by Metallic GratingsTerahertz (THz) radiation has attracted great interests due to its potential applications in imaging,spectroscopy,

13、security and sensing, etc.Schematic of a THz bandpass GMR filter.A Fourier transform infrared spectrometer (FTIR, Thermo Nicolet 6700) was used for the spectral measurement(b)Experimentaland simulated spectra. (c) Measured transmission spectra of devices with different FWHM.5.Narrowband photodetection in the near-inf