Nature Nanotechnology Contents November 2012 Volume 7 Number 11 pp 683-765

Advertisement World's Ultimate AFM Bruker's FastScan achieves atomic force microscopy imaging without compromising highest resolution, application flexibility, or productivity. Work hundreds of times faster. Click to learn more.  TABLE OF CONTENTS November 2012 Volume 7, Issue 11 Editorial Commentary Research Highlights News and Views Review Letters Articles Addendum Advertisement Writing with both hands simultaneously?  Visit Raith and learn about simultaneous electron and ion beam lithography. Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature Outlook: Physics Masterclass From subatomic particles to cosmic-scale phenomena, Nature Outlook: Physics Masterclass uses the Lindau Nobel Laureate Meeting 2012 to launch an examination of some of the biggest breakthroughs in physics. Access the Outlook free online for six months. Supported by: Mars, Incorporated   Editorial Top Graphene is not alone   p683 doi:10.1038/nnano.2012.205 With the rise of two-dimensional transition metal dichalcogenides, graphene is no longer the only two-dimensional crystal attracting significant interest in the research community. Commentary Top Microscopic reversibility as the organizing principle of molecular machines   pp684 - 688 R. Dean Astumian doi:10.1038/nnano.2012.188 Biological motors and pumps are equilibrium devices that couple chemical, electrical and mechanical processes in an environment that is far from equilibrium. Recognition of the key role played by microscopic reversibility in their operation is a first step towards rational design of artificial molecular devices. Research Highlights Top Our choice from the recent literature   p689 doi:10.1038/nnano.2012.199 News and Views Top Atomic force microscopy: A tip for diagnosing cancer   pp691 - 692 Małgorzata Lekka doi:10.1038/nnano.2012.196 Stiffness measurements of tumour biopsies and single cells show unique fingerprints that identify the different stages of cancer. See also: Article by Plodinec et al. Spin injection: Graphene wins the match   pp692 - 693 Hanan Dery doi:10.1038/nnano.2012.180 A single layer of graphene can be used as a tunnel barrier for spin injection in silicon with several advantages over other materials that have previously been used. See also: Article by van 't Erve et al. Graphene: Conductivity measurements pick up   pp693 - 694 Saw Wai Hla doi:10.1038/nnano.2012.195 The conductivity of a single graphene nanoribbon can be measured by lifting the nanoribbon off a surface with the tip of a scanning tunnelling microscope. See also: Letter by Koch et al. Nanowires: Hall effect breaks new ground   pp695 - 696 Ray LaPierre doi:10.1038/nnano.2012.191 Direct determination of carrier concentration and doping in a single nanowire is achieved by placing four electrical contacts along its sidewall. See also: Letter by Storm et al. Spintronics: News from the organic arena   pp696 - 697 Stefano Sanvito and V. Alek Dediu doi:10.1038/nnano.2012.197 Many experiments have demonstrated that the spin direction of an electron survives for a relatively long time in an organic material. Results presented at a recent conference show how such long spin-lifetimes can be used in devices. Nanotechnology JOBS of the week Professor of Polymer Nanotechnology Monash University Postdoc in drug delivery, nanotechnology, and biomaterials University of Michigan 1 Post-Doctoral Research Position (Senior Researcher) and 1 PhD Research Position (a PhD Candidate) in the Fields of Nanotechnology, Self–assembly based Manufacturing, Nanotransfer, Flexible Electronics Ilmenau University of Technology (Germany) More Science jobs from Nanotechnology EVENT 2nd International Conference on Nanotek and Expo 03.-05.12.12 PA, US More science events from Review Top Electronics and optoelectronics of two-dimensional transition metal dichalcogenides   pp699 - 712 Qing Hua Wang, Kourosh Kalantar-Zadeh, Andras Kis, Jonathan N. Coleman and Michael S. Strano doi:10.1038/nnano.2012.193 Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene. Letters Top Voltage-dependent conductance of a single graphene nanoribbon   pp713 - 717 Matthias Koch, Francisco Ample, Christian Joachim and Leonhard Grill doi:10.1038/nnano.2012.169 The conductance properties of a narrow graphene nanoribbon are correlated with its electronic states over a wide range of bias voltages using a scanning tunnelling microscope. See also: News and Views by Hla Spatially resolved Hall effect measurement in a single semiconductor nanowire   pp718 - 722 Kristian Storm, Filip Halvardsson, Magnus Heurlin, David Lindgren, Anders Gustafsson, Phillip M. Wu, Bo Monemar and Lars Samuelson doi:10.1038/nnano.2012.190 Hall effect measurement set-up on a single core–shell semiconductor nanowire enables spatially resolved determination of carrier concentration and mobility in the nanowire shell. See also: News and Views by LaPierre Photoresponse of a strongly correlated material determined by scanning photocurrent microscopy   pp723 - 727 T. Serkan Kasirga, Dong Sun, Jae H. Park, Jim M. Coy, Zaiyao Fei, Xiaodong Xu and David H. Cobden doi:10.1038/nnano.2012.176 Photocurrent microscopy on suspended vanadium dioxide nanobeams reveals the thermal origin of the photoresponse in materials with strong electron–electron and electron–phonon correlations. Selective molecular sieving through porous graphene   pp728 - 732 Steven P. Koenig, Luda Wang, John Pellegrino and J. Scott Bunch doi:10.1038/nnano.2012.162 Selective molecular sieves can be created from porous, micrometre-sized graphene membranes using oxidative etching. Determination of the elastic moduli of thin samples and adherent cells using conical atomic force microscope tips   pp733 - 736 Núria Gavara and Richard S. Chadwick doi:10.1038/nnano.2012.163 Current models used for estimating cell stiffness from atomic force microscopy measurements generally overestimate it. Now, an analytical correction for these models enables the cell stiffness to be estimated more accurately, and improves the use of atomic force microscopy as a diagnostic tool in cancer. Articles Top Low-resistance spin injection into silicon using graphene tunnel barriers   pp737 - 742 O. M. J. van 't Erve, A. L. Friedman, E. Cobas, C. H. Li, J. T. Robinson and B. T. Jonker doi:10.1038/nnano.2012.161 Spin can be injected into silicon from a ferromagnetic contact and across a graphene barrier with resistance-area products up to one thousand times lower than with comparable oxide tunnel barriers. See also: News and Views by Dery An 18.2%-efficient black-silicon solar cell achieved through control of carrier recombination in nanostructures   pp743 - 748 Jihun Oh, Hao-Chih Yuan and Howard M. Branz doi:10.1038/nnano.2012.166 The efficiency of solar cells with high-area, nanostructured surfaces is limited by surface and Auger charge-recombination processes, which can be slowed through appropriate levels of junction doping. In situ atomic-scale imaging of electrochemical lithiation in silicon   pp749 - 756 Xiao Hua Liu, Jiang Wei Wang, Shan Huang, Feifei Fan, Xu Huang, Yang Liu, Sergiy Krylyuk, Jinkyoung Yoo, Shadi A. Dayeh, Albert V. Davydov, Scott X. Mao, S. Tom Picraux, Sulin Zhang, Ju Li, Ting Zhu and Jian Yu Huang doi:10.1038/nnano.2012.170 In situ transmission electron microscopy can be used to study the dynamic lithiation of single-crystal silicon with atomic resolution. The nanomechanical signature of breast cancer   pp757 - 765 Marija Plodinec, Marko Loparic, Christophe A. Monnier, Ellen C. Obermann, Rosanna Zanetti-Dallenbach, Philipp Oertle, Janne T. Hyotyla, Ueli Aebi, Mohamed Bentires-Alj, Roderick Y. H. Lim and Cora-Ann Schoenenberger doi:10.1038/nnano.2012.167 Nanomechanical signatures of human breast biopsies obtained using an atomic force microscope show close correlation between softening of cancer cells and progression of cancer. See also: News and Views by Lekka Addendum Top Magnetoferritin nanoparticles for targeting and visualizing tumour tissues   p765 Kelong Fan, Changqian Cao, Yongxin Pan, Di Lu, Dongling Yang, Jing Feng, Lina Song, Minmin Liang and Xiyun Yan doi:10.1038/nnano.2012.204 Top Advertisement Confronting the Universe - 5 short films on physics At the 2012 Meeting of Nobel Laureates, we filmed five debates on issues that matter to the current generation of researchers. 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