Tecnai G2 F20 U-TWIN场发射透射电子显微镜技术应用案例

Tecnai G2 F20 U-TWIN场发射透射电子显微镜是北京纳米科学大型仪器区域中心国家纳米科学中心的大型仪器设备，是由美国FEI公司生产的，最高加速电压200 kV，Schottky热场发射电子枪，点分辨率 0.19 nm，具有电子束亮度高，束斑尺寸小，相干性好，分辨率高，综合分析能力强等特色。该仪器配备有美国Gatan公司的GIF Tridiem能量过滤成像系统及894 CCD相机、美国EDAX公司X射线能谱仪、数字化扫描附件及高角环形暗场探头等附件，适用于观察各种材料的微观结构并对样品进行纳米尺度的微区分析，功能包括：形貌观察，高分辨电子显微学研究，电子衍射，衍射衬度成像，电子能量损失谱分析及能量过滤成像，X射线能谱分析，原子序数Z-衬度成像等。

该设备自2008年7月正式投入使用以来，有效使用机时已超过5000小时，为国家纳米科学中心、化学所、物理所、过程所、北京大学、清华大学、北京邮电大学、北京理工大学、北京化工大学等三十多家科研院所和高校提供了高水平及高效率的技术支撑服务，为各课题组完成973计划、863计划、国家自然科学基金、院工程创新项目等重大课题提供了关键数据，许多研究成果发表在Nature Nanotechnology，J. Am. Chem. Soc.，Langmuir，Advanced Materials，Angew. Chem. Int. Ed.等国际著名杂志上。

应用案例：

支撑了国家纳米科学中心纳米材料研究室唐志勇研究员课题组所开展的关于纳米粒子自组装的研究，利用扫描透射模式下高角环形暗场成像技术结合X射线能谱技术解决了纳米粒子的元素分布问题，其相关研究结果发表于Nature Nanotechnology 2011, 6, 580-587。

Au-CdSe球状、(k)Au-CdSe棒状核壳结构纳米颗粒的扫描透射高角环形暗场像和X射线能谱元素分布图。

代表性论文：

Jianxiao Gong, Fei Zhou, Zhiyuan Li,* and Zhiyong Tang*. Synthesis of Au@Ag Core−Shell Nanocubes Containing Varying Shaped Cores and Their Localized Surface Plasmon Resonances. Langmuir 2012, 28, 8959−8964.

Xuemei Zhou, Jinyao Lan, Gang Liu,* Ke Deng, Yanlian Yang, Guangjun Nie, Jiaguo Yu,* and Linjie Zhi*. Facet-Mediated Photodegradation of Organic Dye over Hematite Architectures by Visible Light. Angew. Chem. Int. Ed. 2012, 51, 178 –182.

Zhenjiang Zhang, Liming Wang, Jing Wang, Xiumei Jiang, Xiaohui Li, Zhijian Hu,Yinglu Ji, Xiaochun Wu*, Chunying Chen*，Mesoporous Silica-coated Gold Nanorods as a Light-mediated Multifunctional Theranostic Platform for Cancer Treatment. Advanced Materials, 2012, 24: 1418-1423.

Yunsheng Xia, Trung Dac Nguyen, Ming Yang, Byeongdu Lee, Aaron Santos, Paul Podsiadlo, Zhiyong Tang*, Sharon C. Glotzer* and Nicholas A. Kotov*. Self-assembly of self-limiting monodisperse supraparticles from polydisperse nanoparticles. Nature Nanotechnology, 2011, 6, 580-587.

Cuiji Sun, Hui Yang, Yi Yuan, Xin Tian, Liming Wang, Yi Guo, Li Xu,* Jianlin Lei, Ning Gao,Gregory J. Anderson, Xing-Jie Liang, Chunying Chen, Yuliang Zhao,* and Guangjun Nie*. Controlling Assembly of Paired Gold Clusters within Apoferritin Nanoreactor for in Vivo Kidney Targeting and Biomedical Imaging. J. Am. Chem. Soc. 2011, 133, 8617–8624.

Chuan Fei Guo, Sihai Cao, Jianming Zhang, Haoying Tang, Shengming Guo,Ye Tian, and Qian Liu*. Topotactic Transformations of  uperstructures: From Thin Films to Two-Dimensional Networks to Nested Two-Dimensional Networks. J. Am. Chem. Soc. 2011, 133, 8211-8215.

Han Yan, Yong Yan, Zai Yu, and Zhixiang Wei*. Self-Assembling Branched and Hyperbranched Nanostructures of Poly(3-hexylthiophene) by a Solution Process. J. Phys. Chem. C 2011, 115, 3257–3262.

Jinyao Lan, Xuemei Zhou, Gang Liu,* Jiaguo Yu, Jingchang Zhang, Linjie Zhi* and Guangjun Nie*. Enhancing photocatalytic activity of one-dimensional KNbO3 nanowires by Au nanoparticles under ultraviolet and visible-light. Nanoscale, 2011, 3, 5161–5167.

Han Yan, Yong Yan, Zai Yu, and Zhixiang Wei*. Self-Assembling Branched and Hyperbranched Nanostructures of Poly(3-hexylthiophene) by a Solution Process. J. Phys. Chem. C 2011, 115, 3257–3262.

Yong Yan, Jin Fang, Yajie Zhang, Huili Fan, Zhixiang Wei*. Self-Assembled Single-Crystal Polyaniline Microplates and Their Anisotropic Electrical Transport Property. Macromol. Rapid Commun. 2011, 32, 1640–1644.

Peipei Guo, Penglei Chen* and Minghua Liu*. Shuttle-like supramolecular nanostructures formed by self-assembly of a porphyrin via an oil/water system. Nanoscale Research Letters 2011, 6:529.

Yuan-Yuan Feng, Gui-Rong Zhang, Jun-Hong Ma, Gang Liu and Bo-Qing Xu*. Carbon-supported Pt^Ag nanostructures as cathode catalysts for oxygen reduction reaction. Phys. Chem. Chem. Phys., 2011, 13, 3863–3872.

Chao Li, Ke Deng, Zhiyong Tang,* and Lei Jiang. Twisted Metal-Amino Acid Nanobelts: Chirality Transcription from Molecules to Frameworks. J. AM. CHEM. SOC. 2010, 132, 8202–8209.

Weiwei He, Xiaochun Wu,* Jianbo Liu, Ke Zhang, Weiguo Chu, Lili Feng, Xiaona Hu,Weiya Zhou, and Sishen Xie*. Formation of AgPt Alloy Nanoislands via Chemical Etching with Tunable Optical and Catalytic Properties. Langmuir 2010, 26(6), 4443–4448.

Weiwei He, Xiaochun Wu,* Jianbo Liu, Ke Zhang, Weiguo Chu, Lili Feng, Xiaona Hu,Weiya Zhou, and Sishen Xie*. Formation of AgPt Alloy Nanoislands via Chemical Etching with Tunable Optical and Catalytic Properties. Langmuir 2010, 26(6), 4443–4448.

Weiwei He, Xiaochun Wu*, Jianbo Liu, Xiaona Hu, Ke Zhang, Shuai Hou,Weiya Zhou, and Sishen Xie*.Design of AgM Bimetallic Alloy Nanostructures (M=Au, Pd, Pt) with Tunable Morphology and Peroxidase-Like Activity. Chem. Mater. 2010, 22, 2988–2994.

Xuemei Zhou, Hongchao Yang, Chenxuan Wang, Xiaobo Mao, Yinshu Wang, Yanlian Yang, and Gang Liu*. Visible Light Induced Photocatalytic Degradation of Rhodamine B on One-Dimensional Iron Oxide Particles. J. Phys. Chem. C 2010, 114, 17051–17061.

Hongchao Yang, Xuemei Zhou, Tengteng Tang, Xiaoying Qi, Chenxuan Wang, Jinyao Lan,Yinshu Wang, Yanlian Yang* and Gang Liu*. Anisotropic growth of multi-twinned goethite particles by oriented aggregation. CrystEngComm, 2010, 12, 4007–4011.

Qi Liu, Shibing Long, Hangbing Lv, Wei Wang, Jiebin Niu, Zongliang Huo, Junning Chen, and Ming Liu*. Controllable Growth of Nanoscale Conductive Filaments in Solid-Electrolyte-Based ReRAM by Using a Metal Nanocrystal Covered Bottom Electrode. ACS NANO VOL.4, NO.10, 6162–6168, 2010.

Yong-Chun Hong, Ke-Qiang Sun, Ke-Hang Han, Gang Liu, Bo-Qing Xu,∗. Comparison of catalytic combustion of carbon monoxide and formaldehyde over Au/ZrO2 catalysts. Catalysis Today 158 (2010) 415–422.