Navigation Links
Understanding mechanical properties of silicon nanowires paves way for nanodevices

Silicon nanowires are attracting significant attention from the electronics industry due to the drive for ever-smaller electronic devices, from cell phones to computers. The operation of these future devices, and a wide array of additional applications, will depend on the mechanical properties of these nanowires. New research from North Carolina State University shows that silicon nanowires are far more resilient than their larger counterparts, a finding that could pave the way for smaller, sturdier nanoelectronics, nanosensors, light-emitting diodes and other applications.

It is no surprise that the mechanical properties of silicon nanowires are different from "bulk" or regular size silicon materials, because as the diameter of the wires decrease, there is an increasing surface-to-volume ratio. Unfortunately, experimental results reported in the literature on the properties of silicon nanowires have reported conflicting results. So the NC State researchers set out to quantify the elastic and fracture properties of the material.

"The mainstream semiconductor industry is built on silicon," says Dr. Yong Zhu, assistant professor of mechanical engineering at NC State and lead researcher on this project. "These wires are the building blocks for future nanoelectronics." For this study, researchers set out to determine how much abuse these silicon nanowires can take. How do they deform meaning how much can you stretch or warp the material before it breaks? And how much force can they withstand before they fracture or crack? The researchers focused on nanowires made using the vapor-liquid-solid synthesis process, which is a common way of producing silicon nanowires.

Zhu and his team measured the nanowire properties using in-situ tensile testing inside scanning electron microscopy. A nanomanipulator was used as the actuator and a micro cantilever used as the load sensor. "Our experimental method is direct but simple," says Qingquan Qin, a Ph.D. student at NC State and co-author of the paper. "This method offers real-time observation of nanowire deformation and fracture, while simultaneously providing quantitative stress and strain data. The method is very efficient, so a large number of specimens can be tested within a reasonable period of time."

As it turns out, silicon nanowires deform in a very different way from bulk silicon. "Bulk silicon is very brittle and has limited deformability, meaning that it cannot be stretched or warped very much without breaking." says Feng Xu, a Ph.D. student at NC state and co-author of the paper, "But the silicon nanowires are more resilient, and can sustain much larger deformation. Other properties of silicon nanowires include increasing fracture strength and decreasing elastic modulus as the nanowire gets smaller and smaller."

The fact that silicon nanowires have more deformability and strength is a big deal. "These properties are essential to the design and reliability of novel silicon nanodevices," Zhu says. "The insights gained from this study not only advance fundamental understanding about size effects on mechanical properties of nanostructures, but also give designers more options in designing nanodevices ranging from nanosensors to nanoelectronics to nanostructured solar cells."


Contact: Matt Shipman
North Carolina State University

Related biology technology :

1. ISMPP Supports Best Practices and Transparency in Medical Publications: Better Understanding of Terms Such as Ghostwriting Needed
2. Understanding Managed Markets: Effective Market Research Structures & Activities to Maximize Payer Access & Insights
3. Campaign to Increase the Awareness and Understanding of Lou Gehrigs Disease Reaches 22 U.S. States
4. New Survey Reveals Gap in Understanding of Alzheimers Disease Risk and Prevention Among Most Vulnerable Populations
5. Immtech and Beijing Pharmaceutical Group Co. Sign Memorandum of Understanding to Explore Developing Strategic Business Alliance
6. Understanding the science of solar-based energy: more researchers are better than one
7. Prometic reaches understanding for commercialisation of several biopharmaceutical products and strategic investment
8. Scientists fix bugs in our understanding of evolution
9. Digirad Corporation Signs Letter of Understanding With Johns Hopkins University School of Medicine
10. March of Dimes Awards $250,000 Prize to Leaders in Understanding Embryonic Development
11. Understanding of actuator properties of carbon nanotubes bring micro machines closer
Post Your Comments:
Related Image:
Understanding mechanical properties of silicon nanowires paves way for nanodevices
(Date:11/24/2015)... Nov. 24, 2015  Clintrax Global, Inc., a worldwide provider of ... , today announced that the company has set a new quarterly ... quarter on quarter growth posted for Q3 of 2014 to Q3 ... Mexico , with the establishment of an ... --> United Kingdom and ...
(Date:11/24/2015)... PA (PRWEB) , ... November 24, 2015 , ... This ... entrepreneurs at competitive events in five states to develop and pitch their BIG ideas ... projects from each state are competing for votes to win the title of SAP's ...
(Date:11/24/2015)... SHPG ) announced today that Jeff ... 27 th Annual Healthcare Conference in New York ... a.m. EST (1:30 p.m. GMT). --> SHPG ) announced ... in the Piper Jaffray 27 th Annual Healthcare Conference in ... 1, 2015, at 8:30 a.m. EST (1:30 p.m. GMT). --> ...
(Date:11/24/2015)... 2015  Tikcro Technologies Ltd. (OTCQB: TIKRF) today announced that its Annual ... 11:00 a.m. Israel time, at the law offices ... Street, 36 th Floor, Tel Aviv, Israel . ... and Izhak Tamir to the Board of Directors; , ... , approval of an amendment to certain terms of options granted ...
Breaking Biology Technology:
(Date:10/26/2015)... and LAS VEGAS , Oct. 26, ... , an innovator in modern authentication and a founding ... the launch of its latest version of the Nok ... organizations to use standards-based authentication that supports existing and ... Authentication Suite is ideal for organizations deploying customer-facing applications ...
(Date:10/23/2015)... 23, 2015 Research and Markets ( ... Voice Recognition Biometrics Market 2015-2019" report to their ... The global voice recognition biometrics market to grow ... --> --> The report, ... based on an in-depth market analysis with inputs from ...
(Date:10/22/2015)... Oct. 22, 2015  Aware, Inc. (NASDAQ: AWRE ), a ... for its third quarter ended September 30, 2015.  ... of 2015 was $4.0 million, a decrease of 33% compared to ... the third quarter of 2015 was $2.2 million, or $0.10 per ... share, in the same period a year ago.  ...
Breaking Biology News(10 mins):