Informații privind peisajul dezvoltării senzorilor;cresterea comunicatiei;Workshop pentru nanotehnologia senzorilor
Sistem bazat pe laser pentru a ajuta la detectarea armelor chimice, a explozivilor, a narcoticelor și multe altele
au dezvoltat un senzor pe bază de grafen și un comutator care poate detecta poluarea dăunătoare a aerului în casă cu o consumare de energie foarte scăzută
A fost creat un senzor simplu dar eficient pentru monitorizarea ratei de respirație a persoanelor
au dezvoltat un senzor și un comutator bazat pe grafen, care pot detecta poluarea dăunătoare a aerului la domiciliu cu un consum foarte redus de energie.
Senzorul detectează moleculele individuale de CO 2 și moleculele de gaze volatile ale compușilor organici volatili (VOC) găsite în materialele de construcție și interioare, mobilier și chiar bunuri de uz casnic, care afectează în mod negativ locuința noastră în case moderne cu izolație bună.
Aceste gaze chimice dăunătoare au concentrații scăzute ale nivelurilor de ppb (părți per miliard) și sunt extrem de dificil de detectat cu tehnologia actuală a senzorilor de mediu, care poate detecta numai concentrațiile de ppm.
| Posted: Apr 14, 2016 | |
Graphene-based sensor detects harmful air pollution in the home(Nanowerk News) Scientists from the University of Southampton, in partnership with the Japan Advanced Institute of Science and Technology (JAIST), have developed a graphene-based sensor and switch that can detect harmful air pollution in the home with very low power consumption. |
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| The sensor detects individual CO2 molecules and volatile organic compound (VOC) gas molecules found in building and interior materials, furniture and even household goods, which adversely affect our living in modern houses with good insulation. | |
| 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 detect concentrations of parts per million (ppm). | |
| In recent years, there has been an increase in health problems due to air pollution in personal living spaces, known as sick building syndrome (SBS), along with other conditions such as sick car and sick school syndromes. | |
| The research group, led by Professor Hiroshi Mizuta, who holds a joint appointment at the University of Southampton and JAIST, and Dr Jian Sun and Assistant Professor Manoharan Muruganathan of JAIST, developed the sensor to detect individual CO2 molecules adsorbed (the bond of molecules from a gas to a surface) onto the suspended graphene (single atomic sheet of carbon atoms arranged in a honeycomb-like hexagonal crystal lattice structure) one by one by applying an electric field across the structure. | |
| By monitoring the electrical resistance of the graphene beam, the adsorption and desorption (whereby a substance is released from or through a surface) processes of individual CO2molecules onto the graphene were detected as ‘quantised’ changes in resistance (step-wise increase or decrease in resistance). In the study, published today in Science Advances, the journal of the American Association for the Advancement of Science (AAAS), 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 from Southampton and Dr Marek Schmidt and Dr Jian Sun of JAIST, have also recently developed graphene-based switches (published in the March issue of Nanoscale, the journal of the Royal Society of Chemistry) using a uniquely thin film developed at the University of Southampton. | |
| 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. |
| Source: University of Southampton |
au acoperit fire de bumbac și poliester cu un nanoglue numit albumină serică bovină (BSA). Firele au fost apoi învelite în foi de oxid de grafen.Materialele cu acoperire cu oxid de grafen redus s-au dovedit a fi deosebit de sensibile la detectarea dioxidului de azot, un gaz poluant întâlnit frecvent în evacuarea vehiculului, care rezultă și din arderea combustibililor fosili
| Posted: Mar 15, 2016 | |
New graphene-coated e-fabrics detect noxious gases(Nanowerk News) The researchers, from the Electronics and Telecommunications Research Institute and Konkuk University in the Republic of Korea, coated cotton and polyester yarn with a nanoglue called bovine serum albumin (BSA). The yarns were then wrapped in graphene oxide sheets. |
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| Graphene is an incredibly strong one-atom-thick layer of carbon that is known for its excellent conductive properties of heat and electricity. The graphene sheets stuck very well to the nanoglue: so much so that further testing showed the fabrics retained their electrical conducting properties after 1,000 consecutive cycles of bending and straightening and ten washing tests with various chemical detergents. Finally, the graphene oxide yarns were exposed to a chemical reduction process, which involves the gaining of electrons. | |
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| The fiber sensor. (Image: Electronics and Telecommunications Research Institute) | |
| The reduced-graphene-oxide-coated materials were found to be particularly sensitive to detecting nitrogen dioxide, a pollutant gas commonly found in vehicle exhaust that also results from fossil fuel combustion. Prolonged exposure to nitrogen dioxide can be dangerous to human health, causing many respiratory-related illnesses. Exposure of these specially-treated fabrics to nitrogen dioxide led to a change in the electrical resistance of the reduced graphene oxide. | |
| The fabrics were so sensitive that 30 minutes of exposure to 0.25 parts per million of nitrogen dioxide (just under five times above the acceptable standard set by the U.S. Environmental Protection Agency) elicited a response. The fabrics were three times as sensitive to nitrogen dioxide in air compared to another reduced graphene oxide sensor previously prepared on a flat material. | |
| The new technology, according to the researchers, can be immediately adopted in related industries because the coating process is a simple one, making it suitable for mass production. It would allow outdoor wearers to receive relevant information about air quality. The materials could also be incorporated with air-purifying filters to act as “smart filters” that can both detect and filter harmful gas from air. | |
| “This sensor can bring a significant change to our daily life since it was developed with flexible and widely used fibres, unlike the gas sensors invariably developed with the existing solid substrates,” says Dr Hyung-Kun Lee, who led this research initiative. The study was published in Scientific Reports („ARTIKEL”). |
| Source: Electronics and Telecommunications Research Institute |
Deoarece trebuie să funcționeze în fiecare zi, trebuie să-și părăsească zona de confort și să se obișnuiască cu temperaturi, umiditate, ariditate și vibrații foarte variabile
dezvolta senzori ultrasensitivi si selectivi de gaz pentru a diagnostica bolile prin analiza expirarii respiratiei. Profesorul Kim a condus dezvoltarea matricelor senzorilor de nanofibre pe bază de oxid de metal pe bază de oxid de metal, care sunt optimizate pentru recunoașterea modelului de amprente ale respirației ( Small , ” Detectoarele biomemarkerilor bazate pe nanofibre WO 3, activate de catalizatorul încapsulat de proteine auto-asamblate pe polistiren coloid” ).Platforma senzorilor care utilizează nanofibre de oxid de metal poate fi utilizată atât în domeniul diagnosticării bolilor cât și al controlului calității aerului interior / exterior
| Posted: Mar 07, 2016 | |
Development of breath-print sensors for early diagnosis and monitoring of diseases(Nanowerk News) Professor Il-Doo Kim in the Department of Materials Science and Engineering at KAIST is developing ultrasensitive and highly selective gas sensors to diagnose diseases by exhaled breath analysis. Professor Kim has led the development of semiconductor metal oxide-based nanofiber sensor arrays, which are optimized for pattern recognition of breath prints (Small, „WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates”). |
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| Demonstration of breath analysis using nanofibers functionalized with various catalysts for pattern recognition of breath components such as hydrogen sulfide, acetone, and methyl mercaptan for diagnosis of diabetes and halitosis. | |
| Human breath contains a number of volatile organic compounds (VOCs). Accurate detection of specific VOCs in exhaled breath can provide essential information for the early diagnosis of diseases. For example, acetone, H2S, ammonia, and toluene can be used to evaluate diabetes, halitosis, kidney malfunction, and lung cancer, respectively, where the diagnosis of these diseases can be achieved by analyzing the concentration of VOCs in exhaled breath, originating from the molecular exchange between lung tissue and blood. Variations in the concentration of the exhaled VOCs that may serve as biomarkers for specific diseases can distinguish healthy people from those who are sick. | |
| The non-invasive diagnosis of various diseases is the key advantage of exhaled breath analysis techniques over other commonly used methods. For example, conventional diagnostic methods such as MRI, CT, blood test, endoscope, and X-ray examination, which are expensive and sometimes painful, are usually implemented in hospitals. However, in the near future, inexpensive and simple diagnoses are expected to detect and examine diseases in the early stages. The use of multi-sensor arrays with nanostructured semiconductor metal oxides is essential for developing inexpensive and simple diagnostic tools by examining the concentration of VOCs in exhaled breath. The research team has been developing an array of breathing sensors consisting of a number of semiconductor metal oxide fibers, which will offer patients a real-time diagnosis of diseases. | |
| The sensor arrays are advantageous in terms of gas adsorption, leading to large resistance changes achieved by high specific surface area and porous nanostructure. In particular, highly selective biomarker sensing was accomplished by functionalization of diverse noble metallic catalysts such as Au, Pt, Pd, and Rh, which are essential to establishing multiple sensor arrays for analysis of breath prints. These sensor arrays can be integrated with portable devices for real-time monitoring of physical conditions. | |
| ‘The sensor technology is compatible with various types of smartphones, wearable electronic gadgets, and medical devices’ Professor Kim added. | |
| The sensor platform using metal oxide nanofibers can be utilized both in the field of disease diagnosis and indoor/outdoor air quality control. “We believe that there can be many ways to incorporate our technology based on the particular needs of industries, not just in the field of medical devices, such as detecting hazardous chemicals or gases at manufacturing factories.” Professor Kim said. | |
| Currently, Professor Kim has filed 157 domestic and international patents. In addition, he has completed 4 technology transfers. Some of his patents were also transferred to a MEMS gas sensor company (2015). Moreover, the research team received the Grand Prize (Ph.D. candidate, Seon-Jin Choi) at the ‘9th Samsung Inside Edge Paper Competition’ from Samsung Electro-Mechanics in 2013 and the Silver Award (Ph.D. candidate, Sang-Joon Kim) at the ‘21th Samsung Human Tech Paper Competition’ from Samsung Electronics in 2015. Recently, Prof. Kim received Top Excellence Award in the KAIST EEWS Business Pan Contest 2015 (Development of Exhaled Breath Sensor for Diagnosis of Diabetes Based on Analysis of Acetone Concentration in Human Breath, Jan. 2016). |
| Source: Korea Advanced Institute of Science and Technology (KAIST) |
Read more: Development of breath-print sensors for early diagnosis and monitoring of diseases
a creat un senzor productiv în masă, care poate detecta nivelele de amoniac în respirație – o descoperire care ar putea elimina utilizarea acelor în rândul a mii de pacienți
Senzorul ultrasonic, bateriile și tampoanele de presiune sunt părți ale noului sistem care poate fi pus pe cap ca o pălărie sau bandă de susținere
Aplicațiile moderne de supraveghere inteligentă se bazează pe un număr din ce în ce mai mare de senzori eterogeni care diferă foarte mult în ceea ce privește mărimea, costul și fiabilitatea
