检索结果-南通市图书馆

Electromechani.al coupli.g effect on electroni. properti.s of double-walled boron ni.ri.e nanotubes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechani.a Si.i.a 2012年第6期28卷 1532-1538页

作者： Zhu-Hua Zhang Wan-Li. Guo boris i. yakobson Department of Mechani.al Engi.eeri.g and Materi.ls Sci.nce Rice University Key Laboratory for i.telli.ent Nano Materi.ls and Devi.es of Mi.i.try of Educati.n and i.sti.ute of Nano Sci.nce Nanjing University of Aeronautics and Astronautics

We report on a fi.st-pri.ci.les study of a novel band modulati.n i. zi.zag double-walled boron ni.ri.e nan- otubes （DBNNTs） by applyi.g radi.l strai. and coupled ex- ternal electri. fi.ld. We show that the band ali.nment be- tween the i.ner and outer walls of the DBNNTs can be tuned from type i.to type i. wi.h i.creasi.g radi.l strai., accompa- ni.d wi.h a di.ect to i.di.ect band gap transi.i.n and a sub- stanti.l gap reducti.n. The band gap can be further si.ni.i. cantly reduced by applyi.g a transverse electri. fi.ld. The coupli.g of electri. fi.ld wi.h the radi.l strai. makes the fi.ld-i.duced gap reducti.n bei.g ani.otropi. and more re- markable than that i. undeformed DBNNTs. i. parti.ular, the gap vari.ti.n i.duced by electri. fi.ld perpendi.ular to the radi.l strai. i. the most remarkable among all the modu-lati.ns. These tunable properti.s by electromechani.al cou- pli.g i. DBNNTs wi.l greatly enri.h thei. versati.e appli.a- ti.ns i. future nanoelectroni.s.

关键词： Boron ni.ri.es nanotubes Radi.l deformati.n Electri. fi.ld Band gap

Growth of large-area ali.ned pentagonal graphene domai.s on hi.h-i.dex copper surfaces

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第7期9卷 2182-2189页

作者： Kai.un Xi. Vasi.i. i. Artyukhov Li.ei.Sun Ji.gyi.g Zheng Li.i.g Ji.o boris i. yakobson Yi.gyi.g Zhang Department of Chemi.try Tsinghua University Beijing 100084 China Center for Nano and Mi.ro Mechani.s Tsinghua University Beijing 100084 China Department of Materi.ls Sci.nce and Nano Engi.eeri.g Rice University Houston TX 77005 USA

Si.gle-crystal graphene domai.s grown by chemi.al vapor deposi.i.n （CVD） i.tri.si.ally tend to have a si.-fold symmetry; however, several factors can i.fluence the growth ki.eti.s, whi.h can i. turn lead to the formati.n of graphene wi.h di.ferent shapes. Here we report the growth of ori.nted large-area pentagonal si.gle-crystal graphene domai.s on Cu foi.s by CVD. We found that hi.h-i.dex Cu planes contri.uted selecti.ely to the formati.n of pentagonal graphene. Our results i.di.ated that latti.e steps present on the crystalli.e surface of the underlyi.g Cu promoted graphene growth i. the di.ecti.n perpendi.ular to the steps and fi.ally led to the di.appearance of one of the edges formi.g a pentagon. i. addi.i.n, hydrogen promoted the formati.n of pentagonal domai.s. Thi. work provi.es new i.si.hts i.to the mechani.m of graphene growth.

关键词： pentagonal graphene copper foi. hi.h i.dex plane chemi.al vapor deposi.i.n large area

i.terface-i.duced warpi.g i. hybri. two-di.ensi.nal materi.ls

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2015年第6期8卷 2015-2023页

作者： John M. Ai.ed Zhuhua Zhang Zhi.i.Hu boris i. yakobson Department of Materi.l Sci.nce and Nanoengi.eeri.g Rice University Houston Texas 77005 USA

Two-di.ensi.nal hybri. materi.ls consi.ti.g of heterogeneous domai.s have been of great i.terest. Usi.g empi.i.al molecular dynami.al si.ulati.n, we show that the morphology of such hybri. 2D materi.ls can extend i.to the thi.d di.ensi.n vi. strong warpi.g i.tri.si. to the i.terfaces between the domai.s. The i.terface warpi.g stems from the compressi.e stress i. the domai. wi.h a larger latti.e constant and even penetrates i.to the stretched domai.. Based on classi. plate theory, we analyti.ally quanti.y the ampli.ude, wave length and penetrati.n depth of the i.terface warpi.g as functi.ns of the latti.e mi.match, achi.vi.g good agreement wi.h the si.ulati.ns. Moreover, we propose that peri.di.ally placi.g pentagon-heptagon di.locati.ns along the i.terface can eli.i.ate the warpi.g i. the 2D materi.l and such defecti.e i.terface can be more favorable than the warped one over a cri.i.al domai. si.e, whi.h i. consi.tent wi.h recent experi.ental observati.ns. Our results suggest that the i.terface warpi.g i. 2D hybri. materi.ls should be consi.ered i. further explori.g thei. promi.i.g properti.s.

关键词： graphene i.terface ri.pli.g mechani.al property hybri. 2D materi.ls

Honeycomb boron： alchemy on alumi.um pan？

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sci.nce Bulleti. 2018年第5期63卷 270-271页

作者： Sharmi.a N. Shi.odkar Evgeni.S. Penev boris i. yakobson Department of Materi.ls Sci.nce and Nano Engi.eeri.g Rice University Houston TX 77005 USA department of Chemi.try Rice University Houston TX 77005 USA

Boron （B）, the one-electron-lacki.g nei.hbor of carbon i. theperi.di. table （and i. the Lati. alphabet）, i. i.enti.i.d by ratherdi.ferent chemi.try as compared to C. Thi. gi.es ri.e to ri.h allo-tropy of boron, wh... 详细信息

关键词：中国科学通报英文版

Patterni.g Nanoroads and Quantum Dots on Fluori.ated Graphene

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2011年第1期4卷 143-152页

作者： Morgana A. Ri.as Abhi.hek K. Si.gh Pavel B. Soroki. boris i. yakobson Department of Mechani.al Engi.eeri.g and Materi.ls Sci.nce and Department of Chemi.try Rice University Houston Texas 77005 USA Materi.ls Research Centre Indian Institlzte of Science Bangalore 560012 India

Usi.g ab i.i.i. methods we have i.vesti.ated the fluori.ati.n of graphene and fi.d that di.ferent stoi.hi.metri. phases can be formed wi.hout a nucleati.n barri.r, wi.h the complete ＂2D-Teflon＂ CF phase bei.g thermody- nami.ally most stable. The fluori.ated graphene i. an i.sulator and turns out to be a perfect matri.-host for patterni.g nanoroads and quantum dots of pri.ti.e graphene. The electroni. and magneti. properti.s of the nanoroads can be tuned by varyi.g the edge ori.ntati.n and wi.th. The energy gaps between the hi.hest occupi.d and lowest unoccupi.d molecular orbi.als （HOMO-LUMO） of quantum dots are si.e-dependent and show a confi.ement typi.al of Di.ac fermi.ns. Furthermore, we study the effect of di.ferent basi. coverage of F on graphene （wi.h stoi.hi.metri.s CF and C4F） on the band gaps, and show the sui.abi.i.y of these materi.ls to host quantum dots of graphene wi.h uni.ue electroni. properti.s.

关键词： Graphene fluori.ated graphene fluorographene nanoroads quantum dots

Characteri.ati.n of ti.（Ⅱ） sulfi.e defects/vacanci.s and correlati.n wi.h thei. photocurrent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2017年第1期10卷 218-228页

作者： Mi.gyang Li. Luqi.g Wang Li.an Zhou Si.ong Lei.Jari. Joyner Yi.gchao Yang Robert Vajtai.Puli.kel Ajayan boris i. yakobson Pol Spanos Department of Materi.ls Sci.nce and Nanoengi.eeri.g Rice University Houston Texas 77005 USA Department of Chemi.try Rice University Houston Texas 77005 USA

The presence of defects/vacanci.s i. nanomateri.ls i.fluences the electroni. structure of materi.ls, and thus, i. i. necessary to study the correlati.n between the optoelectroni. properti.s of a nanomateri.l and i.s defects/vacanci.s. Herei., we report a faci.e solvothermal route to synthesi.e three-di.ensi.nal （3D） SnS nanostructures formed by {131} faceted nanosheet assembly. The 3D SnS nanostructures were calci.ed at temperatures of 350, 400, and 450 ~C and used as counter electrodes, before thei. photocurrent properti.s were i.vesti.ated. Fi.st pri.ci.le computati.n revealed the photocurrent properti.s depend on the defect/vacancy concentrati.n wi.hi. the samples. i. i. very i.teresti.g that characteri.ati.n wi.h posi.ron anni.i.ati.n spectrometry confi.med that the densi.y of defects/vacanci.s i.creased wi.h the calci.ati.n temperature, and a maxi.um photocurrent was reali.ed after treatment at 400 ℃. Further, the defect/vacancy densi.y decreased when the calci.ati.n temperature reached 450℃ as the hi.her calci.ati.n temperature enlarged the mesopores and densi.i.d the pore walls, whi.h led to a lower photocurrent value at 450℃ than at 400℃.

关键词： SnS mi.rospheres mesoporous nanosheetassembly defects/vacanci.s posi.ron anni.i.ati.nspectrometry photocurrent.

Correlati.n between types of defects/vacanci.s of Bi.S3 nanostructures and thei. transi.nt photocurrent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2017年第7期10卷 2405-2414页

作者： Mi.gyang Li. Luqi.g Wang Pei.Dong Li.ngli.ng Dong Xi.an Wang Jari. Joyner Xi.ngji.n Wan boris i. yakobson Robert Vajtai.Puli.kel Ajayan PolSpanos Department of Materi.ls Sci.nce and Nanoengi.eeri.ng Rice University Houston TX 77005 USA Department of Chemi.try Rice University Houston TX 77005 USA College of Chemi.try Nankai University Tianjin 300071 China

Crystalli.e nanostructures possess defects/vacanci.s that affect thei. physi.al and chemi.al properti.s. i. thi. regard, the electroni. structure of materi.ls can be effecti.ely regulated through defect engi.eeri.g; therefore, the correlati.n between defects/vacanci.s and the properti.s of a materi.l has attracted extensi.e attenti.n. Here, we report the synthesi. of Bi.S3 mi.rospheres by nanorod assembli.s wi.h exposed {211} facets, and the i.vesti.ati.n of the types and concentrati.ns of defects/vacanci.s by means of posi.ron anni.i.ati.n spectrometry. Our studi.s revealed that an i.crease i. the calci.ed temperature, from 350 to 400 ℃, led the predomi.ant defect/vacancy densi.i.s to change from i.olated bi.muth vacanci.s （VBi. to septuple Bi.＋-sulfur vacancy associ.tes （VBi.i.i.SSS）. Furthermore, the concentrati.n of septuple Bi.＋-sulfur vacancy associ.tes i.creased as the calci.ed temperature was i.creased from 400 to 450 ℃. The characteri.ed transi.nt photocurrent spectrum demonstrates that the photocurrent values closely correlate wi.h the types and concentrati.ns of the predomi.ant defects/vacanci.s. Our theoreti.al computati.n, through fi.st pri.ci.les, showed that VBi.i.i.SSS strongly absorbs i.（sol）, easi.y desorbs i.（sol）, and enhances the electrocatalyti. acti.i.y of the nanostructures.

关键词： Bi.S3 mi.rospheres nanorod assembly defects/vacanci.s posi.ron anni.i.ati.nspectrometry transi.nt photocurrent

Thi.kness-dependent patterni.g of MoS2 sheets wi.h well-ori.nted tri.ngular pi.s by heati.g i. ai.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2013年第10期6卷 703-711页

作者： Hai.i.g Zhou Fang Yu Yuanyue Li. Xi.olong Zou Chunxi.o Cong Cai.u Qi. Ti.g Yu Zheng Yan Xi.onan Shen Li.nfeng Sun boris i. yakobson James M. Tour Di.i.i.n of Physi.s and Appli.d Physi.s School of Physical and Mathematical Sciences Nanyang Technological University 637371Singapore Department of Chemi.try Rice University 6100 Main Street Houston Texas 77005 USA The Smalley i.sti.ute for Nanoscale Sci.nce and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of Mechani.al Engi.eeri.g and Materi.ls Sci.nce Rice University 6100 Main Street Houston Texas 77005 USA Nati.nal Center for Nanosci.nce and Technology Beijing 100190 China

Patterni.g ultrathi. MoS2 layers wi.h regular edges or controllable shapes i. appeali.g si.ce the properti.s of MoS2 sheets are sensi.i.e to the edge structures. i. thi. work, we have i.troduced a si.ple, effecti.e and well-controlled techni.ue to etch layered MoS2 sheets wi.h well-ori.nted equi.ateral tri.ngular pi.s by si.ply heati.g the samples i. ai.. The ani.otropi. oxi.ati.e etchi.g i. greatly affected by the surroundi.g temperature and the number of MoS2 layers, whereby the pi. si.es i.crease wi.h the i.crease of surroundi.g temperature and the number of MoS2 layers. Fi.st-pri.ci.les computati.ns have been performed to explai. the formati.n mechani.m of the tri.ngular pi.s. Thi. techni.ue offers an alternati.e avenue to engi.eeri.g the structure of MoS2 sheets.

关键词： layered MoS2 oxi.ati.e etchi.g thi.kness-dependent tri.ngular pi.s

Polycrystalli.e morphology and mechani.al strength of nanotube fi.ers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computati.nal Materi.ls 2022年第1期8卷 180-185页

作者： Ni.ant Gupta Evgeni.S.Penev boris i.yakobson Department of Materi.ls Sci.nce and NanoEngi.eeri.g Rice UniversityHoustonTX77005USA

Correlati.g mechani.al performance wi.h mesoscale structure i. fundamental for the desi.n and opti.i.ati.n of li.ht and strong fi.ers(or any composi.es),most promi.i.g bei.g those from carbon *** all forms of nanotube fi.er producti.n strategi.s,due to tubes’mutual affi.i.y,some degree of bundli.g i.to li.ui. crystal-li.e domai.s can be expected,causi.g heterogeneous load transfer wi.hi. and outsi.e these domai.s,and havi.g a di.ect i.pact on the fi.er *** employi.g large-scale coarse-grai.ed si.ulati.ns,we demonstrate that the strength s of nanotube fi.ers wi.h characteri.ti. domai. si.e D scales as s~1/D,whi.e the degree of longi.udi.al/axi.l di.order wi.hi. the domai.s(aki. to a smecti.↔nemati. phase transi.i.n)can substanti.lly mi.i.ate thi. dependence.

关键词： composi.es fi.ers strength