【微型传感器:可检测家中空气和家具中的污染,预防生病】

【微型传感器:可检测家中空气和家具中的污染,预防生病】家中的空气中包含900多种化学和生物材料,许多人因此患上病态建筑物综合症。英国南安普敦大学的科学家发明微型传感器,它通过最小的功率检测空气中的 CO2 分子和挥发性有机化合物,实现了节省成本和检测空气污染的双重目标。http://www.looooker.com/?p=26562

The tiny sensor that could stop your home making you SICK: Sheet detects harmful pollution in the air and on furniture

  • The sensor was built by scientists from the University of Southampton 
  • It works by detecting CO2 molecules and volatile organic compounds 
  • Air in homes can contain more than 900 chemicals and biological materials

Your furniture, cleaning projects and even your home's building materials could be riddled with volatile compounds making you sick.

In recent years, there has been an increase in health problems due to air pollution in personal living spaces, known as sick building syndrome.

Now, researchers have developed a tiny sensor and switch that can detect this harmful pollution while using minimal power.

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The sensor was built by scientists from the University of Southampton, in partnership with the Japan Advanced Institute of Science and Technology (JAIST).

It works by detecting individual CO2 molecules and volatile organic compound (VOC) gas molecules found in building and interior materials, furniture and even household goods.

These harmful chemical gases have low concentrations of ppb (parts per billion) levels and are extremely difficult to detect with current environmental sensor technology, which can only typically detect concentrations of parts per million (ppm).

Air circulating inside homes can contain more than 900 chemicals, particles and biological materials with potential health effects.

Mould spores, pollen, radon, carbon monoxide and dander all lurk within homes, seeping through cracks in walls and floorboards, brought in on clothing or produced by wood burners, gas hobs and detergents used in cleaning.

The research group, led by Professor Hiroshi Mizuta developed the sensor to detect individual CO2 molecules adsorbed - the bond of molecules from a gas to a surface - onto a sheet of suspended graphene.

This is a single atomic sheet of carbon atoms arranged in a honeycomb-like hexagonal crystal lattice structure.

In the study a small volume of CO2 gas (equivalent to a concentration of approximately 30 ppb) was released and the detection time was only a few minutes.

Professor Mizuta said: 'In contrast to the commercially available environmental monitoring tools, this extreme sensing technology enables us to realise significant miniaturisation, resulting in weight and cost reduction in addition to the remarkable improvement in the detection limit from the ppm levels to the ppb levels.'

Research group members, Dr Harold Chong, Dr Marek Schmidt and Dr Jian Sun also recently developed graphene-based switches using a uniquely thin film developed at the University of Southampton.

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The switches, which require remarkably low voltages, below three volts, can be used to power electronic components on demand, greatly improving the battery lifetime of personal electronic devices.

Professor Mizuta and the research group are now aiming to bring the two technologies together to create ultra-low-power environmental sensor systems that can detect single molecules.

The findings are published in the journal Science Advances from the American Association for the Advancement of Science (AAAS).

原文链接:http://www.dailymail.co.uk/sciencetech/article-3542006/The-tiny-sensor-stop-home-making-SICK-Sheet-detects-harmful-pollution-air-furniture.html

 


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