Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Colorful Warning

Abstract:
Selective, sensitive CO detection with a rhodium complex

Colorful Warning

Weinheim, Germany | Posted on July 6th, 2010

Carbon monoxide is an insidious poison: it is colorless, odorless, and toxic at low concentrations. It is usually produced by combustion engines or incomplete combustion in gas furnaces or wood-burning fireplaces. Spanish researchers working with Ramón Martínez-Máñez have now developed a sensitive and selective detector that reliably detects CO in air. As the scientists from the IDM Research Institute at the Polytechnic University of Valencia report in the journal Angewandte Chemie, their system involves a special rhodium complex that distinctly changes color in the presence of CO.

In the USA alone, there are 15,000 accidents with CO reported annually; 500 of these are fatal. The implementation of reliable warning devices in dangerous locations is thus correspondingly important. Most modern CO sensors are electronic; as an alternative, researchers are looking for detectors that indicate the presence of CO by a color change. However, such colorimetric detection methods remain rare, don't function in air, or are not sensitive enough.

Based on a special complex of rhodium, the Spanish researchers have now developed a CO detector that not only reliably detects CO in solution, but also in air. The detection limit is low enough that it responds before toxic levels are reached.

At the core of the complex are two rhodium atoms connected to each other by acetate groups and two special phosphorus-containing ligands (cyclometallated phosphines). The metals are also bound axially by two acetic acid ligands. The complex molecule is deposited onto silica gel, where it is adsorbed; this forms a gray-violet solid. If the complex comes into contact with air containing CO, one or two molecules of CO bind to the rhodium by forcing the acetic acid molecules out of their axial binding sites on the two rhodium atoms. Within a few minutes, this causes a distinct color change in the solid, which becomes orange-yellow. Treatment with a stream of clean air completely regenerates the detector.

The detection system is highly selective for CO. It does not respond to CO2, volatile organic compounds, or SO2. It only reacts to NO2 when it is present in extremely high concentrations. The researchers hope that this system will form the basis for efficient, low-maintenance chemosensors for the easy and inexpensive detection of CO. "For instance colorimetric detection systems of CO can be implemented in clothes, paintings etc.," says Martínez-Máñez, "and the presence of CO will then simply be detected via a color change visible to the naked eye". In contrast, electronic equipment needs a source of electricity and is difficult to incorporate into the fabric of clothes.

Author: Ramón Martínez-Máñez, Universidad de Valencia (Spain),

Title: Sensitive and Selective Chromogenic Sensing of Carbon Monoxide using Binuclear Rhodium Complexes

Angewandte Chemie International Edition 2010, 49, No. 29, 4934-4937, Permalink to the article: http://dx.doi.org/10.1002/anie.201001344

####

Copyright © Angewandte Chemie

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

Possible Futures

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanotechnology in Energy Applications Market Research Report 2014-2018: Radiant Insights, Inc January 15th, 2015

'Mind the gap' between atomically thin materials December 23rd, 2014

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Sensors

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanosensor Used for Simultaneous Determination of Effective Tea Components January 24th, 2015

Iranian Scientists Produce Graphene-Based Oxygen Sensor January 23rd, 2015

Announcements

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

Home

The Original Frameless Shower Doors Installs DFI's FuseCube™ to Offer Hydrophobic Protective Coating as a Standard Feature: First DFI FuseCube™ Installed on the East Coast to Enable Key Differentiator for the Original Frameless Shower Doors January 29th, 2015

Materials - Next-generation insulation ... January 13th, 2015

Biosenta Inc. Updates New Household Disinfectant Testing Results; It Kills 100% of a Broad Range of Deadly Molds, Fungi, Bacteria, and Viruses, Including Ebola and Enterovirus D68 November 20th, 2014

Iranian Nano Scientists Create Flame-Resistant Polymers September 13th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE