材料分析文献报告

1、材料分析文献(wnxin)报告（纳米光子学中用到的材料测试方法） 姓名(xngmng)：陈义富 学号：157238242015.10.11共十八页1.Optical properties of silver nano-cubes介绍金属内部与表面存在大量自由电子, 形成自由电子气团, 即等离子体(plasmon); 而表面等离子体则特指存在于金属表面的自由电子气团. 当入射光与金属纳米结构表面自由电子气团的振动发生共振时就形成了表面等离子体共振(surface plasmon resonance,SPR)。金属纳米结构的表面等离子体光学(gungxu)在光催化、光学(gungxu)传感、生物标

2、记、医学成像、太阳能电池, 以及表面增强拉曼光谱等领域有广泛的应用前景, 这些功能也和金属纳米结构与光相互作用时产生的表面等离子体共振密切相关。共十八页(a) 电场作用下金属纳米颗粒等离子体振荡(zhndng)示意图 (b) 电场作用下金属-电介质界面等离子体振荡示意图, 电场可以被局域在亚波长尺度内共十八页Synthesis of silver nano-cubes Optical properties is an important property and signature of nanomaterials. Here the silver nano-cubes prepared by

3、 chemical reduction method. Silver nano-cubes have been synthesized by reducing AgNO3 with ethylene glycol using poly (vinyl pyrrolidone) (PVP) as a stabilizing agent. 共十八页 Characterization analysisX-ray diffraction studies of the silver nano-cubes have been carried out X-ray diffractometer (XRD). C

4、u Ka X-rays of wavelength = 1.54056 . Size and morphology of the silver nano-cubes have been obtained by transmission electron micro-scopy (TEM), operating at an accelerating voltage of 200 kV.共十八页(1).X-ray diffraction(XRD) analysisThe reflections are indexed as (111), (200) and (220) with thecorres

5、ponding 2h values of 38.013, 44.133and 64.104 respectively.共十八页All 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 (

6、shape factor) and b is broadening of diffraction line measured at 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

7、be 86 nm (approx).共十八页 (A) TEM micrograph of silver nano-cubes, with (C) High resolution TEM image, (B) Particle size distribution histogram and (D) SAED pattern of silver nanocrystals(2).High Resolution Transmission Electron Microscopy(HRTEM)共十八页2.Effect of Ag shapes and surface compositions on the

8、 photocatalytic performance of Ag/Zno nanorodsLately, a growing interest 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. Howev

9、er, the shape of noble metals was also an important factor which may affect the SPR effect.共十八页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。共十八页 For all patterns, the primary diff

10、raction peaks at 2h values of 31.72,33.42 and 36.28 corresponding to the (002), (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

11、 direction. The other peaks in the XRD patterns of AZP and AZH samples are observed due to the dispersion of Ag on ZnO nanorods surface. 共十八页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 (highmagni

12、fication).TEM study共十八页3.Photodetection with Active Optical AntennasOptical antennas are key elements in the conversion of light from free space to ultrasmall, nanometer-scale volumes.共十八页4.Narrow-Linewidth and High-Transmission Terahertz Bandpass Filtering by Metallic GratingsTerahertz (THz) radiat

13、ion has attracted great interests due to its potential applications in imaging,spectroscopy,security and sensing, etc.Schematic of a THz bandpass GMR filter.共十八页A Fourier transform infrared spectrometer (FTIR, Thermo Nicolet 6700) was used for the spectral measurement(b)Experimentaland simulated spe

14、ctra. (c) Measured transmission spectra of devices with different FWHM.共十八页5.Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device(a) Schematic of a gold grating on an n-type silicon substrate with a 2-nm Ti adhesion layer (b) Scanning electron microscopy image of gold grating structure.共十八页共十八页内容摘要