Microheater

About: Microheater is a research topic. Over the lifetime, 814 publications have been published within this topic receiving 12478 citations.

Ammonia Chemical Microsensor Using ZnO Thin Film and Novel Microheater Design

Abstract: The resistive semiconducting metal oxide gas sensors currently constitute one of the most investigated groups of gas detecting device...

Robust catalytic gas sensing using a silicon carbide microheater

Abstract: This paper reports the first use of a silicon carbide (SiC) microheater for stable low-power catalytic gas sensing. Catalytic combustion of hydrocarbon gases often requires high operating temperatures, which leads to instability in a previously developed low-power polycrystalline silicon (polysilicon) microheater. A silicon carbide microheater has been developed with low power consumption (20 mW to reach 500 °C) and improved stability, exhibiting an order of magnitude lower resistance drift than the polysilicon microheater after 100 hrs of continuous heating at 500 °C and during temperature increases up to 650 °C. When loaded with a high performance catalytic nanomaterial, the SiC microheater-based catalytic gas sensor exhibits fast response and recovery time (<1 s) and improved long-term stability for propane detection. The results show that a simple change of material from polysilicon to polySiC leads to a significant performance improvement of the microheater and the resulting sensor element.

An electrochemical biosensor with integrated microheater to improve the sensitivity of electrochemical nucleic acid biosensors

Abstract: Electrochemical impedance spectroscopy is often used for biomolecular detection based on the interaction of a molecule with a receptor functionalised electrode surface and consequent impedance change. Though its performance is well established, there is still a need for improved sensitivity and specificity, especially when attempting to detect nucleic acids from clinical samples with minimal amplification steps. Localised heating is a potential approach for improving nucleic hybridisation rates and reducing non-specific interactions, and thereby producing high sensitivity and selectivity. The aim of the study was therefore to develop a microheater surrounding Au thin film electrodes, an integrated hybrid chip, for detecting genes of Mycobacterium tuberculosis with enhanced sensitivity. The performance of the integrated hybrid chip was determined using the changes in the charge transfer resistance (R ct) upon DNA hybridisation using probe sequences for M. tuberculosis. Heat transfer within the system was simulated by using COMSOL Multiphysics as a mathematical modelling tool. When a temperature of 50 °C was applied to the microheater during DNA hybridisation steps, R ct values (which were indicative of DNA–DNA hybridisation) increased 236% and 90% as opposed to off-chip non-heated experiments and off-chip heated experiments. It is concluded from these observations that the microheater indeed can significantly improve the performance of the nucleic acid hybridisation assay and paves the way for the development of highly sensitive and specific integrated label-free biosensors.

Micro bio chip for sample pre-treatment and dna purification method using the same

Abstract: PURPOSE: A microbiochip for pretreatment of sample and a method for extracting DNA using the same are provided to reduce the amount of sample, time, cost, and labor. CONSTITUTION: A micro biochip(100) for pretreatment of a sample comprises: a heating unit which regulates temperature for efficient experiment; a PDMS(polydimethylsiloxane) chip(130) having a channel(132) with a micro-filter for extracting pure DNA; and thin film glass chip(140). The heating unit comprises a glass chip(160) placed at the lower part of the thin film glass chip, micro heater, and temperature sensor(180). A method for extracting DNA using the micro biochip comprise: a step of injecting microbead to the channel in reaction bath; a step of filtering microbead in a micropillar; a step of injecting sample cells to the channel; a step of heating the sample cells with the microheater to break cell wall; and a step of extracting DNA.

Intellectual Thermoconductometric Unit Based on Aerosol Printed Ceramic MEMS Sensor for the Measurement of Natural Gas Composition

Abstract: The online control of natural gas quality is important for customers, because for them the important value is calorific value of consumed gas, but not its volume. The application of thermoconductometric sensor gives simple possibility to fabricate imbedded intellectual plug-and-play device for this control. The ceramic MEMS sensor based on a combination of this ceramic LTCC membrane and aerosol jet printed platinum microheater was used as a sensing element of this unit. The electronic unit controlling the sensor was designed to stabilize the temperature of the microheater and to measure power necessary to maintain this temperature at different concentrations of N2and CO2 in natural gas. The application of this unit enables the measurement of admixtures of nitrogen and CO2 with detection limit of about 1 vol. % sufficient for the application in gas meter instruments.