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"Supernatural powers" electronic nose to identify food and test chemicals

Smell the product quality inspection

In May this year, the University of Valencia, Spain, and the scientists at the University of Gavle, Sweden, made an electronic nose with 32 sensors to identify the smell of various fruits because they contained similar chemical complexes called "esters " They say that the technology can eventually be used to identify the type of grapes, quality, and even the age of wine.

"We put the fruit sample in the pre-combustion chamber and inject the airflow into the sensor of the electronic nose," said Sebastian, a Spanish scientist who participated in the study. "The sensor made of metal oxide semiconductors can recognize the smell Of the complex, such as methane and butane ". Then the scientist uses the computer software to collect and analyze the information obtained from the sensor, the analysis results can be used to compare the scores of 3D images.

In February at the cross-strait modern agriculture summit forum, in the Strait of Agricultural Research Institute, the collar technology companies signed tea electronic nose joint research and development projects, will set up electronic nose application research institute, application of nanotechnology and micro-electromechanical systems, research and development The mainland's first high-sensitivity third-generation array of odor sensors for tea quality grade rapid detection.

Breathe cancer

In 2010, researchers at the Israel Institute of Science and Technology developed an array of nanosensors that were expected to be used in cancer detection in a short period of time; the appearance of a device similar to a breath analyzer, The use of gold nanoparticle array on the substrate, it is said that not only can identify the presence of cancer cells, but also to detect the type of cancer.

The array of nanosensors is made of a metal electrode arranged in a forked shape, and the electrodes are arranged in a circuit pattern on which electron beams are deposited on a silicon wafer covered with a thermal oxide layer. The size of the device is only a few millimeters, and the distance between the electrodes is about 20 microns. Each electrode is used as a guest receptor for nanoparticle coverage and can adsorb different types of cancer cell molecules in respiration.

The array of nanosensors described above is assembled on an internal circuit board of a device similar to an exhalation analyzer. When the device is exposed to the patient's exhalation, any molecules of the guest receptor on the nanoparticles change the current of the electrode Conduction, and to distinguish the detected types of cancer. The sensitivity of the device is to detect the presence of cancer from several molecules in billions of molecules.

Detection of dangerous goods

Recently, the British technical staff are trying to implant the sensor into the clothing, so that the wearer important disease signal monitoring, or prompted the presence of dangerous chemicals wearer.

Touch technology innovation company Peratech is now using Quantum Channel Synthesis (QTC) sensors, and the London Art University to develop wearable electronic products. This is a three-and-a-half year research project that aims to bring together a highly innovative industry and academia experience in a creative way to explore the needs and applications of wearable technology. It is reported that QTC technology is currently being applied to robots, cars, touch screen and consumer electronics products and a series of areas.

The core of this technology is that the pressure on the QTC material can change its resistance. Putting QTC ink on the fabric can play a simple on / off function, but more interesting is that because the resistance will vary with the size of the applied pressure, some areas of the fabric may become sensitive to touch or can recognize the pressure the size of.

In addition to touch the touch, QTC materials can also be found in the presence of volatile organic compounds. This so-called printable electronic nose sensor works in the presence of volatile organic compounds, QTC material will expand, so you can change the resistance of QTC material. In addition to high sensitivity, this material also has the characteristics of fast response and recovery.

According to the volatile organic compounds to be developed to develop different formulations in order to print low-cost early warning sensors and related electronic products onto textiles to produce products that can monitor the presence of disease, fatigue or dangerous chemicals of the wearer The "These sensors, in addition to pressure and chemical attack for military personnel monitoring, can also be implanted into mass fabrics to monitor the daily health of the wearer, which is due to certain volatility," said the scientists involved in the study. Organic compounds may be an early warning signal for health problems. "

(Source: China Chemical Instrument Network)

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