Zinc Oxide Semiconductors Nanowires ( The ) For Gas Detection

The use of nano-materials and extreme precision micro-engineering has the potential for great improvement in the world of electronics and information technology by providing smaller, faster, and more powerful computers and this has been at the forefront of the nanotechnology commercialization . Great examples of how nanotechnology is currently being used in these fields are products such as processors, data storage, and memory components made with nano-materials, TVs, monitors and even smartphone screens that use organic light-emitting diodes (OLED), and waterproof electronics such as smartphones due to the application of nano-coatings

The purpose of this experiment is to investigate some physical and chemical properties of gases and to use these properties to identify these gases when they are encountered.

The mixture was cooled to room temperature and 40mL of of water was added. The stopper was placed on the flask and shaken until the liquid residue solidified. After the product solidified, the flask was placed in an ice bath and the solid was was broken up with a string rod until it was a fine powder. The product was then collected by vacuum filtration and was washed three time with 5-mL of cold water then left to dry.

...Properties of Gases General Chemistry 1 Lab 5 Abstract: The purpose of this experiment is...

When recording the data one must be very cautious when matching the data with the correct temperature and make sure that the temperature is both accurate and precise. Also when collecting the data on the computer with gas pressure sensor you must wait make sure that it is fully configured to prevent from repeating the experiment, moreover, one should make sure that the rubber stopper is secured so no gas can escape and affect the data. Finally, more trials should be done to have more conclusive data.

precipitate; then pour over the solid in the funnel. Finally, pour two 10-mL portions of

A pressure sensor measures the amount of force can object has and this will tell us how the pressure is affecting the number of particles. Also the volume, of the pressure

The first and foremost advice to keep your gas detection device in optimal condition is by keeping it clean and dust-free. Avoiding contamination is also very

Then add about 50cm³ of distilled water ensuring you continue to stir until crystals have dissolved. Then transfer the solution into a 100cm³ volumetric flask

The sensor element is encased in a ceramic cylinders both inside and outside with platinum electrodes and the entire assembly is wrapped in metal gauge. The sensors work effectively at high temperature. When the temperature is at and above 3160C (6000F). Most new sensors are equipped with their own heating elements. There are three main types of oxygen sensors. They are:

VA CNT synthesis and VA CNT membrane fabrication procedures were followed from the protocols of our previous study [28]. VA CNT synthesis was based on the water vapor assisted chemical vapor deposition (CVD) process. VA CNTs were grown on a Fe (1.5 nm)/Al (15 nm)/Si wafer. After the coating, the Si wafer was cut into rectangular chips, with the dimension of 9 mm width and 9 mm length, and the chopped chips were inserted in a cylindrical electric furnace of a CVD machine. Carbon source was high-purity ethylene gas (99.99%) at a flow rate of 100 sccm (standard cubic centimeters per minute indicating cc/min at a standard temperature and pressure). Argon (99.999%) was used as the carrier gas at a flow rate of 300 sccm. Hydrogen gas (99.999%, 200 sccm) and water vapor (50 sccm) by argon purging were added to the gases stream. Reaction was performed at 750 °C for 40 min.

Scanning probe microscopy in nano mechanical testing has started with the invention of the scanning tunneling microscope in the year 1981. Till then based on the type of principles there are number of models developed and are in use. Scanning probe microscopy found popularity owing to its ease in versatility in dealing with a number of issues, typically it is used to identify the material properties on nano to even pico scales. Scanning probe microscopy techniques such as atomic/friction force microscopy(AFM/FFM) are increasingly finding applications in tribological studies of engineering surfaces as well for finding surface texture etc. Atomic and molecular level details can be assessed using Scanning probe microscopy with

Among a variety of sensing mechanisms and device architectures, field effect transistors (FET) based devices are ideal biosensors for point-of-care systems since they can directly convert the specific binding between receptors on the gate surface and target analytes to an electrical signal for low-cost, rapid, and sensitive detection, for which signal acquisition and processing units can be simply integrated. Although silicon based metal oxide FETs (MOSFETs) (planar or nanowire) [45,46], carbon nanotube based FETs and graphene based FETs [47-49] have been widely studied as candidates for advanced biosensing applications, they are somewhat limited in various facets.

Microbial spoilage is a major problem in bakery products since it can induce nutritional losses, off-flavours, and formation of mycotoxins or potentially allergenic spores we have to store food (like fruits, vegetables etc.) in cold storage for future use. If suitable environment (proper temperature, humidity etc) is not maintained in the storage area, after some time due to growth of micro-organisms, chemical reactions and various other factors, food get spoiled. Due to the presence of enzymes in food and growth of bacteria, some chemical changes occur in food. Due to these chemical changes, some gases produce like Carbon dioxide (CO2), Ammonia (NH3), Methane (CH4), Hydrogen sulphide (H2S). As the time passes, the decomposition goes ahead and the concentration of these gases increases in the storage environment. By using different gas sensors, detection of concentration of these gases in air can be done. By monitoring the concentration of these gases, we can estimate the quality of food kept in store. This detector detects the amount of some specific gases present in the air of storage area in which food is stored and alarms us about the changes in the ratios of these gases.

In recent years, the use of bionanosensors in medical diagnostics has seen a favorable rise in research due to a growing need for reliable, early-detection methods of diseases and viruses. Bionanosensors have proven their integration in smart-phone applications that further breach the boundaries between reliable, accurate, and readily-available tools for point-of-care diagnostics and treatment. Biosensors are