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Soluble Graphene Through Edge-Selective Functionalization

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Nano Research 2010年第2期3卷 117-125页

作者： zhengzong sun Shin-ichiro Kohama Zengxing Zhang Jay RLomeda James M.Tour Department of Chemistry and Mechanical Engineering and Materials Science and the Smalley Institute for Nanoscale Science and Technology Rice UniversityMS 2226100 Main StreetHoustonTexas 77005USA

Thermally expanded graphite was functionalized with 4-bromophenyl addends using the in situ diazonium formation procedure,and after mild sonication treatment in N,N’-dimethylformamide,thin graphene layers were exfoliated from the bulk *** chemically-assisted exfoliated graphene(CEG)sheets had higher solubility than pristine graphene without any stabilizer *** than 70%of these soluble flakes had less than 5 *** filtered transmission electron microscopy(EFTEM)elemental mapping provided evidence of the edge-selective diazonium functionalization with graphene.A majority of the Br signals came from the edges of the CEG indicating that the basal planes were not highly *** CEG was also characterized by X-ray photoelectron spectroscopy,atomic force microscopy,Raman spectroscopy,and transmission electron microscopy.

关键词： Edge-selective functionalization graphene energy filtered transmission electron microscopy(EFTEM) chemically-assisted exfoliation

Proton antagonist membrane towards exclusive CO_(2)reduction

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Nano Research 2023年第4期16卷 4589-4595页

作者： Taishi Xiao Yao Ma Shicheng Zeng Xiang Yao Tong Ye Hongbin Li Wei Li zhengzong sun Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200433China School of Microelectronics and State Key Laboratory of ASIC and System Fudan UniversityShanghai 200433China

Membrane electrode assembly reactor offers great promise toward practical CO_(2)***,traditional proton exchange membrane possesses strong acidic chemical environment,which facilitates undesired hydrogen evolution *** we report a proton antagonist strategy,through which the proton diffusion pathways have been severely impeded by Na+cation to produce an alkaline-rich *** this new membrane electrode assembly,we can significantly suppress the hydrogen evolution and achieve a Faradaic efficiency of 95.7%for CO with 51.5%energy *** addition,our proton antagonist membrane outperforms the commercial anion exchange membrane in both conductivity and oxidation resistance lifetime,which are crucial for large scale electrolysis of carbon neutral chemicals.

关键词： CO_(2)reduction proton antagonist membrane electrode assembly

Effect of anchor and functional groups in functionalized graphene devices

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Nano Research 2013年第2期6卷 138-148页

作者： Elvira Pembroke Gedeng Ruan Alexander Sinitskii David A. Corley Zheng Yan zhengzong sun James M. Tour Departments of Chemistry Rice University MS 222 6100 Main Street Houston Texas 77005 USA Computer Science Mechanical Engineering and Materials Science and the Smalley Institute for Nanoscale Science and Technology Rice University MS 222 6100 Main Street Houston Texas 77005 USA

The electrical properties of chemically derived graphene and graphene grown by chemical vapor deposition （CVD）, until now, have been inferior to those of mechanically exfoliated graphene. However, because graphene is easier to produce in large quantities through CVD or growth from solid carbon sources, it has a higher potential for use in future electronics applications. Generally, modifications to the pristine lattice structure of graphene tend to adversely affect the electrical properties by shifting the doping level and changing the conductivity and the mobility. Here we show that a small degree of graphene surface functionalization, using diazonium salts with electron-withdrawing and electron-donating functional groups, is sufficient to predominantly induce p-type doping, undiminished mobility, and higher conductivity at the neutrality point. Molecules without a diazonium anchor group desorb easily and do not have a significant effect on the electronic properties of graphene devices. We further demonstrate the variability between identically fabricated pristine devices, thereby underscoring the caution needed when characterizing graphene device behaviors lest conclusions be drawn based on singular extremes.

关键词： chemical vapor deposition graphene diazonium functionali zation neutrality point

Radical Addition of Perfluorinated Alkyl Iodides to Multi- Layered Graphene and Single-Walled Carbon Nanotubes

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Nano Research 2010年第2期3卷 138-145页

作者： Christopher E.Hamilton Jay R.Lomeda zhengzong sun James M.Tour Andrew R.Barron Richard E.Smalley Institute for Nanoscale Science and Technology Department of Chemistry and Department of Mechanical Engineering and Materials ScienceRice UniversityHoustonTexas 77005USA

A simple one-pot reaction that serves to functionalize graphite nanosheets(graphene)and single-walled carbon nanotubes(SWNTs)with perfluorinated alkyl groups is *** radical addition of 1-iodo-1H,1H,2H,2H-perfluorododecane to ortho-dichlorobenzene suspensions of the carbon nanomaterial is initiated by thermal decomposition of benzoyl ***,UV photolysis of 1-iodo-perfluorodecane serves to functionalize the carbon ***-SWNTs,perfluorododecyl-graphene,and perfluorodecyl-graphene are characterized by infrared(IR)and Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),thermogravimetric analysis(TGA),and atomic force microscopy(AFM).The products show enhanced dispersability in CHCl3 as compared to unfunctionalized starting *** advantage of this one-pot functionalization procedure lies in the use of pristine graphite as starting material thereby avoiding the use of harsh oxidizing conditions.

关键词： Nanotube single-walled carbon nanotube graphene radical addition

Large-area high quality PtSe2 thin film with versatile polarity

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InfoMat 2019年第2期1卷 260-267页

作者： Wei Jiang Xudong Wang Yan Chen Guangjian Wu Kun Ba Ningning Xuan Yangye sun Peng Gong Jingxian Bao Hong Shen Tie Lin Xiangjian Meng Jianlu Wang zhengzong sun National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghaiChina Department of Chemistry Shanghai UniversityShanghaiChina

Two-dimensional(2D)materials have attracted increasing attention for their outstanding structural and electrical ***,for mass-production of field effect transistors(FETs)and potential applications in integrated circuits,large-area and uniform 2D thin films with high mobility,large on-off ratio,and desired polarity are needed to synthesize ***,a transfer-free growth method for platinum diselenide(PtSe2)films has been *** PtSe2 films have been synthesized with various thicknesses in centimeter-sized *** FET made from a few layer PtSe2 show p-type unipolar,with a high field-effect hole mobility of 6.2 cm^(2) V^(−1) s^(−1) and an on-off ratio of 5×10^(3).The versatile semimetal-unipolar-ambipolar transition in synthesized PtSe2 films is also firstly observed as the thickness *** work realizes the large-scale preparation of PtSe2 with prominent electrical properties and provides a new strategy for polarity's modulation.

关键词： 2D materials large-area platinum diselenide polarity

An artificial neural network chip based on two-dimensional semiconductor

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Science Bulletin 2022年第3期67卷 270-277页

作者： Shunli Ma Tianxiang Wu Xinyu Chen Yin Wang Hongwei Tang Yuting Yao Yan Wang Ziyang Zhu Jianan Deng Jing Wan Ye Lu zhengzong sun Zihan Xu Antoine Riaud Chenjian Wu David Wei Zhang Yang Chai Peng Zhou Junyan Ren Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and TechnologyFudan UniversityShanghai 200433China Shenzhen Sixcarbon Technology Shenzhen 518106China School of Electronic and Information Engineering Soochow UniversitySuzhou 215006China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Recently,research on two-dimensional(2D)semiconductors has begun to translate from the fundamen-tal investigation into rudimentary functional *** this work,we unveil the first functional MoS2 artificial neural network(ANN)chip,including multiply-and-accumulate(MAC),memory and activation function *** MoS2 ANN chip is realized through fabricating 818 field-effect transistors(FETs)on a wafer-scale and high-homogeneity MoS2 film,with a gate-last process to realize top gate structured FETs.A 62-level simulation program with integrated circuit emphasis(SPICE)model is utilized to design and optimize our analog ANN *** demonstrate a practical application,a tactile digit sensing recognition was demonstrated based on our ANN *** training,the digit recognition rate exceeds 97%.Our work not only demonstrates the protentional of 2D semiconductors in wafer-scale inte-grated circuits,but also paves the way for its future application in AI computation.

关键词： MoS_(2) Two-dimensional(2D)FETs Artificial neural network(ANN) Multiply-and-accumulate(MAC) Circuits

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氧化物结合多孔碳化硅陶瓷的性能研究

耐火材料 2019年第4期53卷 258-262页

作者：刘永启叶根喜孙广超陈正宗刘家栋栗艳兵刘开琪南京必蓝环境技术有限公司江苏南京211000 中国科学院过程工程研究所多相复杂系统国家重点实验室北京100190

为降低多孔碳化硅陶瓷的烧结温度,降低生产成本,使用210 μm的近等径碳化硅颗粒为骨料,以木炭粉为造孔剂,采用以铝溶胶和硅溶胶按1∶ 5质量比配成的混合溶胶以及 d 50 =12.4 μm的ρ-Al2O3粉为结合剂,于1 400 ℃空气气氛下常压烧结2 h... 详细信息

为降低多孔碳化硅陶瓷的烧结温度,降低生产成本,使用210 μm的近等径碳化硅颗粒为骨料,以木炭粉为造孔剂,采用以铝溶胶和硅溶胶按1∶ 5质量比配成的混合溶胶以及 d 50 =12.4 μm的ρ-Al2O3粉为结合剂,于1 400 ℃空气气氛下常压烧结2 h制备出氧化物结合多孔碳化硅试样。研究了试样的性能,并观察显微结构变化。结果表明:制备的氧化物结合多孔碳化硅O形环强度为23.4 MPa,抗热震试验10次后,强度降低到 19.7 MPa 。试样的平均孔径为64.3 μm,显气孔率为38.1%,在过滤风速1 m·min^-1 时,10 mm壁厚试样的阻力降为30.2 Pa;在1 200 ℃保温100 h热处理后阻力降增加到39.7 Pa。当温度超过1 000 ℃时,由于碳化硅表面氧化改变了孔隙结构,使得阻力降增加,因此不宜在超过1 000 ℃温度下长期使用。

关键词：氧化物结合多孔碳化硅阻力降 O形环强度过滤速度

纳米碳在腹腔镜胃癌根治术淋巴结示踪中的应用

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重庆医学 2022年第8期51卷 1371-1374页

作者：余仙谭镇宗孙浩李卫赵和照重庆大学附属肿瘤医院肿瘤转移与个体化诊治转化研究重庆市重点实验室 400030

目的探讨纳米碳在腹腔镜胃癌根治术淋巴结示踪的可行性。方法选取2016年3-10月该院胃肠外科收治的49例胃癌患者为研究对象,分为纳米碳组(23例)和对照组(26例)。纳米碳组采用腹腔镜下静脉输液针注射法在肿瘤周围浆膜下注射纳米碳后行腹... 详细信息

目的探讨纳米碳在腹腔镜胃癌根治术淋巴结示踪的可行性。方法选取2016年3-10月该院胃肠外科收治的49例胃癌患者为研究对象,分为纳米碳组(23例)和对照组(26例)。纳米碳组采用腹腔镜下静脉输液针注射法在肿瘤周围浆膜下注射纳米碳后行腹腔镜胃癌根治术,对照组则常规行腹腔镜胃癌根治术。比较2组淋巴结检出及手术情况,并观察围术期并发症发生情况。结果与对照组比较,纳米碳组淋巴结检出个数更多,微小淋巴结检出率更高,淋巴结检出时间更短,手术时间更长,手术出血量更低,差异有统计学意义(P0.05)。2组并发症发生率比较差异无统计学意义(P>0.05),无手术相关死亡,围术期未发生与纳米碳注射相关的不良反应。结论纳米碳可用于腹腔镜胃癌根治术淋巴结示踪。

关键词：胃癌腹腔镜手术纳米碳淋巴结示踪

西藏仲巴地区白垩系-第三系(C-T)界线的中子活化研究

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核技术 1984年第6期 4-7页

作者：柴之芳毛雪瑛马淑兰孙亦因尹集祥刘成杰徐道一张勤文杨正宗中国科学院高能物理所中国科学院地质所国家地震局地质所地质矿产部地质科学院地质所中国科学院北京天文台

用中子活化法研究了取自西藏仲巴地区白垩系-第三系界线的一套岩石样品,初步实验结果表明,界线粘土层显示有高浓度的铱,本文从铱的浓度分布、在界面附近碳酸钙的含量变化以及稀土元素的丰度模式等方面,探讨了界线事件的原因,其中地外物... 详细信息

用中子活化法研究了取自西藏仲巴地区白垩系-第三系界线的一套岩石样品,初步实验结果表明,界线粘土层显示有高浓度的铱,本文从铱的浓度分布、在界面附近碳酸钙的含量变化以及稀土元素的丰度模式等方面,探讨了界线事件的原因,其中地外物质撞击是有吸引力的一个机制。

关键词：中子活化罕见事件铱异常