Navigation Links
A giant step toward miniaturization
Date:4/3/2013

Bottom-up synthesis of nanowires through metal-catalyzed vapor phase epitaxy is a very attractive process to generate high-quality nanowires thus providing an additional degree of freedom in design of innovative devices that extend beyond what is achievable with the current technologies. In this nano-fabrication process, nanowires grow through the condensation of atoms released from a molecular vapor (called precursors) at the surface of metallic nano-droplets. Gold is broadly used to form these nano-droplets. This self-assembly of nanowires takes place spontaneously at optimal temperature and vapor pressure and can be applied to synthesize any type of semiconductor nanowires. However, to functionalize these nanomaterials a precise introduction of impurities is central to tune their electronic and optical properties. For instance, the introduction of group III and V impurities in a silicon lattice is a crucial step for optimal design and performance of silicon nanowire technologies. The accurate control of this doping process remains an outstanding challenge that is increasingly complex as a result of the relentless drive toward device miniaturization and the emergence of novel nanoscale device architectures.

In a recent development, a team of scientists from Polytechnique Montral (Canada), Northwestern University (USA), and Max Planck Institute of Microstructure Physics (Germany) led by Professor Oussama Moutanabbir has made a fascinating discovery of a novel process to precisely functionalize nanowires. By using aluminum as a catalyst instead of the canonical gold, the team demonstrated that the growth of nanowires triggers a self-doping process involving the injection of aluminum atoms thus providing an efficient route to dope nanowires without the need of post-growth processing typically used in semiconductor industry. Besides the technological implications, this self-doping implies atomic scale processes that are crucial for the fundamental understanding of the catalytic assembly of nanowires. The scientists investigated this phenomenon at the atomistic-level using the emerging technique of highly focused ultraviolet laser-assisted atom-probe tomography to achieve three-dimensional atom-by-atom maps of individual nanowires. A new predictive theory of impurity injections was also developed to describe this self-doping phenomenon, which provides myriad opportunities to create entirely new class of nanoscale devices by precisely tailoring shape and composition of nanowires. The results of their breakthrough will be published in Nature.


'/>"/>

Contact: Nathalie Rochette
nathalie.rochette@polymtl.ca
514-340-4711 x2339
Polytechnique Montral
Source:Eurekalert

Related biology news :

1. Giant squids giant eyes: The better to see hungry whales with
2. Jurassic pain: Giant flea-like insects plagued dinosaurs 165 million years ago
3. First satellite tag study for manta rays reveals habits and hidden journeys of ocean giants
4. Big-mouthed babies drove the evolution of giant island snakes
5. Ancient giant turtle fossil revealed
6. Giant raft of data to help us understand disease
7. Engineering technology reveals eating habits of giant dinosaurs
8. Study of giant viruses shakes up tree of life
9. Do Australias giant fire-dependent trees belong in the rainforest?
10. Climate change threatens giant pandas bamboo buffet and survival
11. Climate change threatens giant pandas bamboo buffet -- and survival
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/30/2016)... and WARSAW, Poland , Nov. 30, 2016 Not many ... of the most crucial aspects of recovery so we need to do it well. ... risks, including heart problems, high blood pressure, stroke, diabetes, and even cancer. ... and find a Christmas present that could help them to manage their sleep quality? ... ...
(Date:11/29/2016)... , Nov. 29, 2016   Neurotechnology ... and object recognition technologies, today released FingerCell ... fingerprint recognition solutions that run on low-power, ... template using less than 128KB of memory, ... devices that have limited on-board resources, such ...
(Date:11/24/2016)... 2016 Cercacor today introduced Ember TM ... non-invasively measure hemoglobin, Oxygen Content, Oxygen Saturation, ... Rate in approximately 30 seconds. Smaller than a smartphone, ... access to key data about their bodies to help ... Hemoglobin carries oxygen to muscles. When ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... OXFORD, England , December 8, 2016 ... Company, has expanded its customisable SureSeqâ„¢ NGS panel range with ... - allowing fast and cost-effective study of variants in familial ... copy number variation (CNV) detection on a single small panel ... and hotspot content. This includes all exons for LDLR ...
(Date:12/8/2016)... CA (PRWEB) , ... December 08, 2016 , ... ... as finalists in the World Technology Awards. uBiome is one of just six ... across all categories. , In addition to uBiome, companies nominated as finalists in ...
(Date:12/8/2016)... , Dec. 8, 2016  HedgePath Pharmaceuticals, ... that discovers, develops and plans to commercialize innovative ... shares of common stock were approved for trading ... begin trading on the OTCQX, effective today, under ... for the OTCQX market, companies must meet high ...
(Date:12/8/2016)...   Biocept, Inc . (NASDAQ: ... actionable liquid biopsy tests to improve the management ... its Target Selectorâ„¢ Circulating Tumor Cell platform demonstrated ... of actionable biomarkers in patients with metastatic breast ... Cannon Research Institute (SCRI), the research arm of ...
Breaking Biology Technology: