Carbon nanotube nanothermometers

Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanomaterial
View previous topic :: View next topic  
Author Message
Site Admin

Joined: 16 Mar 2004
Posts: 1392

PostPosted: Wed Sep 20, 2006 10:16 am    Post subject: Carbon nanotube nanothermometers Reply with quote

Carbon nanotube nanothermometers
by Michael Berger

The oxidation-assisted temperature measurement with carbon nanotube nanothermometers that contain liquid gallium is a novel and reliable method that can be used over a moderate temperature range and can be applied in any environment where air is present.

All the other available techniques that are capable to measure temperature at the nanometer scale are limited by either that they are only workable in a very narrow temperature range or that they can only be applied in a special environment.

One particular problem to arise from both the continuing miniaturization of existing technologies and the advent of nanotechnologies is that conventional devices for temperature measurements, such as thermometers and thermocouples, are not capable of measuring the temperatures of these systems at the scale on which they operate. Thus, a pressing scientific problem is the need for a viable technique for measuring temperature at the nanoscale.

A previous approach in using carbon nanothermometers focused on a single nanothermometer and involved preliminary calibration in a transmission electron microscope (TEM) to record the initial level of the liquid Ga. The complexity of this approach is that the same nanothermometer needs to be found again after use to make the final reading in a TEM.

In a novel approach, researchers at the NANO Major National Research Facility based in the Australian Key Centre for Microscopy and Microanalysis at the University of Sydney, and the Advanced Materials Laboratory at the National Institute for Materials Science in Japan, came up with a one-step procedure without the need for any calibration process. It provides a simpler and, importantly, a far more reliable way to measure temperatures over a moderate temperature range at the nanometer scale.

When a Ga-filled carbon nanotube is heated in air for an appropriate length of time, an oxide marker is formed on the inner wall of the carbon nanotube due to partial oxidation of the Ga. Thus, the temperature to which the nanotube was exposed can be retrieved by progressively heating the carbon nanotube until the liquid Ga reaches the oxide marker.


This story was first posted on 20th July 2006.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanomaterial All times are GMT
Page 1 of 1

Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001, 2002 phpBB Group