Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Highly Conductive Germanium Nanowires Made by a Simple, One-Step Process

27.04.2015

Lithium-ion batteries could benefit from this inexpensive method.

The Science


Image courtesy of Jay Switzer

Scanning electron micrograph image of germanium nanowires electrodeposited onto an indium tin oxide electrode from aqueous solution.

For the first time, germanium nanowires have been deposited on indium tin oxide substrate by a simple, one-step process called electrodeposition.

The Impact

The germanium nanowires produced by this method have superior electronic properties compared to silicon and can be used as high-capacity anode material for lithium-ion batteries, but the nanowires were previously too expensive and difficult to produce. This process may resolve the cost issue to advance this battery technology.

Summary

Germanium is a semiconductor that has superior electronic properties compared to silicon, and is being considered as a replacement for silicon in semiconductor technology. It is also an attractive anode material for lithium-ion batteries because it has a large theoretical charge-discharge capacity compared to graphite and high lithium ion diffusivity at room temperature compared to silicon.

The large volume changes associated with charge-discharge processes require anodes be made of high-surface-area nanostructures of germanium. A lack of inexpensive and simple methods to produce germanium nanostructures has so far limited their use in battery electrode applications.

Now, researchers at the Missouri University of Science and Technology have shown for the first time that germanium nanowires can be deposited by a simple, one-step process called electrodeposition that could provide a low cost route to fabricate these anodes.

The nanowires were grown on an indium tin oxide substrate. An electrochemical reduction produces tiny indium nanoparticles on the indium tin oxide surface, which act as sites for the nucleation and crystallization of germanium nanowires.

The nanowire diameter can be controlled by the solution temperature: wires grown at room temperature have an average diameter of 35 nanometers, whereas those grown at 95°C have an average diameter of 100 nanometers. The germanium nanowires produced by this method are highly conductive, because they contain a small amount of indium impurity (~0.2 atomic percent), making them ideal for lithium-ion battery applications.

Funding

DOE Office of Science, Basic Energy Sciences.

Publication

N.K. Mahenderkar, Y.C. Liu, J. A. Koza, J.A. Switzer, “Electrodeposited germanium nanowires.” ACS Nano 9, 9524–9530 (2014). [DOI: 10.1021/nn503784d]

Contact Information
Kristin Manke
kristin.manke@science.doe.gov

Kristin Manke | newswise

More articles from Materials Sciences:

nachricht Barely scratching the surface: A new way to make robust membranes
13.12.2018 | DOE/Argonne National Laboratory

nachricht Topological material switched off and on for the first time
11.12.2018 | ARC Centre of Excellence in Future Low-Energy Electronics Technologies

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: An energy-efficient way to stay warm: Sew high-tech heating patches to your clothes

Personal patches could reduce energy waste in buildings, Rutgers-led study says

What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

Magic number colloidal clusters

13.12.2018 | Life Sciences

UNLV study unlocks clues to how planets form

13.12.2018 | Physics and Astronomy

Live from the ocean research vessel Atlantis

13.12.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>