Community

Stanford Nanoscience & Nanotechnology Society (SNNS) is a student organization dedicated to foster interdisciplinary collaboration on nanoscience & technology in Stanford's nano-community, to provide a forum for exchange of ideas among students from different backgrounds, and to promote interaction with industrial (particularly Silicon Valley) and academic institutes beyond the university. As part of this effort our website attempts to bring together people in the nanosociety community through the Forums section. Please register and post questions, answers and potential collaborations to the Stanford Nano-community

Focus

The Society is consisted of five sub-fields, Nanophotonics, Nanoelectronics, Energy/Clean Technology, Nano-Biology and Nanostructures/Nano-characterization.

Seminars

The Society host biweekly student seminar every other Friday lunchtime (see Events) which features in-depth discussion on certain research topic among one of the sub-fields.

News

• 2009-05-19 09:20:25: May 22, 2009: NanoLab: Handheld Diagnostic Laboratory
  NanoLab: Handheld Diagnostic Laboratory
  
  Speakers: Drew Hall and Rich Gaster, Shan X. Wang Group
  
  Friday, May 22, 12-1 pm, McCullough 115
  
  
  Abstract
  
  In third world countries, access to medical diagnostic laboratories and well
  trained technicians is limited. As a result, the majority of diagnoses in
  these regions are based upon patient signs and symptoms. While this method
  of patient care is suitable in straightforward situations such as diagnosing
  the flu, the vast majority of illnesses cannot be determined by simple
  observation. In contrast, in the developed world, medical decision-making is
  increasingly based on molecular testing where quantitative detection of
  disease-specific proteins in serum and other bodily fluids has become the
  basis behind virtually any therapy. Here, we present a technology that will
  make it feasible to bring the same diagnostic potential of the developed
  world to third world countries or the patient’s home. More specifically, we
  have designed a handheld device capable of quantitative multiplex protein
  detection in a very simple to use, wash-free assay that is more sensitive
  than the Enzyme Linked Immunosorbent Assay (ELISA), the current gold
  standard in protein detection. Due to the ease of use, portability, and low
  cost, our platform could have a very broad impact on society ranging from
  molecular diagnostics in remote villages in Africa (which lack laboratory
  equipment and skilled technicians) to over the counter home diagnostics kits
  that can be purchased at your local pharmacy.
  
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  Pizzas will be served.
  
  
  
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• 2009-05-08 07:42:50: Mechanical Properties of Small Scale Materials Using Nanoindentation
  Speaker - Dr. Seung Min Han
  Bio - Dr. Han graduated with Ph.D. from Dr. William Nix’s group in Materials Science and Engineering in 2006, and joined the MSE department as an Acting Assistant Professor since then. Dr. Han is currently also part of Dr. Yi Cui’s group for in-situ TEM nanoindentation of nanosturctures.
  
  Location: McCullough 115
  Time: 12:00 noon - 1:00pm
  Date: May 08(Friday) – Tomorrow!
  
  Abstract:
  
  As the dimensions of today’s devices become smaller and smaller, understanding the mechanical properties of materials at sub-micron length scales becomes more challenging. The conventional methods for evaluating strengths of materials in bulk form cannot be applied, and new methodologies are required for accurately evaluating mechanical properties of thin films. In this study, the method of microcompression testing, which involves using a focused ion beam to synthesize sub-micron sized pillars and subsequently testing with a flat punch tip of a nanoindenter, is used to evaluate mechanical properties of Al-Al3Sc multilayers with varying bilayer thicknesses from 6-100nm. The measured yield strengths show the trend of increasing strength with decreasing bilayer period, and agree with the nanoindentation hardness results upon applying the suitable Tabor factor correction. The deformation of the Al-Al3Sc pillars at large strains showed strain softening that causes inhomogeneous deformation. A new model was developed to account for the inhomogeneous geometry to calculate the stress-strain in this regime of strain softening. A TEM study of deformed pillar showed shearing and rotation of layering structure that could be responsible for the observed strain softening behavior.
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• 2009-04-24 02:32:37: Apr. 24 (Friday) Stanford Nanoscience & Nanotechnology Society Seminar
  Stanford Nanoscience & Nanotechnology Society Seminar:
  
  Transparent Conductors: the Current and the Future
  
  Speaker - Jung-Yong Lee (Prof. Peter Peumans group)
  http://peumans-pc.stanford.edu/
  
  Location: McCullough 115
  Time: 12:00 noon - 1:00pm
  Date: Apr. 24 (Friday) – Tomorrow!
  
  Abstract:
  Transparent conductive electrodes are important components of thin-film solar cells, light-emitting diodes, and many display technologies. Doped metal oxides are commonly used, but their optical transparency is limited for films with a low sheet resistance. Furthermore, they are prone to cracking when deposited on flexible substrates, are costly, and require a high-temperature step for the best performance. We demonstrate solution-processed transparent electrodes consisting of random meshes of metal nanowires that exhibit an optical transparency equivalent to or better than that of metal-oxide thin films for the same sheet resistance. Organic solar cells deposited on these electrodes show a performance equivalent to that of devices based on a conventional metal-oxide transparent electrode.
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