Related Experiment Video
Updated: Jan 28, 2026
06:48
Author Spotlight: Exploring Self-Assembled MOF-Polymer Composites
Published on: June 14, 2024
2.6K
A Low-Power MEMS IDE Capacitor with Integrated Microhotplate: Application as Methanol Sensor using a Metal-Organic
Manjunath R Venkatesh1, Sumit Sachdeva2, Brahim El Mansouri3
1Beijing Research Centre, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands. m.ramachandrappavenkatesh@tudelft.nl.
Sensors (Basel, Switzerland)
|February 23, 2019
Summary
This study presents a low-power micro-hotplate with interdigitated electrodes for sensing methanol vapor. The device demonstrates temperature-dependent methanol detection using Zeolitic imidazolate framework (ZIF-8) material.
Area of Science:
- Materials Science
- Chemical Engineering
- Electrical Engineering
Background:
- Interdigitated electrodes (IDEs) offer low-power, micro-fabricated platforms for volatile organic compound (VOC) sensing.
- Integrating micro-electromechanical systems (MEMS) like microhotplates enables temperature-dependent VOC sensing studies.
Purpose of the Study:
- To design, fabricate, and characterize a low-power MEMS microhotplate with an IDE capacitor.
- To investigate the temperature-dependent sensing response of Zeolitic imidazolate framework (ZIF-8) to methanol vapor.
Main Methods:
- Fabrication of a Titanium nitride (TiN) microhotplate with aluminum IDEs on a silicon nitride membrane.
- Coating the device with ZIF-8 metal-organic framework (MOF) for methanol detection.
- Characterization of power consumption, methanol response, and temperature-dependent kinetics.
Main Results:
- The ZIF-8 coated device exhibited methanol detection in the 500-7000 ppm range with a 100 ppm detection limit at 20°C.
- Power consumption was 4.5 mW at 50°C and 26 mW at 200°C.
- Increased temperature (20-50°C) significantly reduced response (28%) and recovery (70%) times for 5000 ppm methanol.
Conclusions:
- The developed MEMS microhotplate with IDE capacitor is effective for studying temperature-dependent VOC sensing.
- ZIF-8 MOF demonstrates promising performance for methanol detection, with kinetics influenced by temperature.
- Optimizing operating temperature can enhance sensor response and recovery speeds.
Related Concept Videos
01:29Integrals of Powers of Sine and Cosine
54
Trigonometric integrals involve the integration of expressions containing powers of sine, cosine, and related functions. They are common in calculus problems and have applications in physics and engineering. The method for integrating expressions of the form sinm(x)cosn(x) depends on whether the exponents are odd or even.If the power of sine is odd, one sine factor is separated from the integrand, leaving an even power of sine. The remaining sine terms are rewritten in terms of cosine using the...
54
01:18Integrals of Powers of Secant and Tangent
62
Integrals involving powers of tangent and secant are commonly evaluated using substitution, with the strategy determined by the parity of the exponents. The method relies on pairing part of the integrand with the derivative of a suitable trigonometric function and rewriting the remaining factors using trigonometric identities.When the power of secant is even, tangent is chosen as the substitution variable. Since the derivative of tangent is secant squared, a factor of sec2x can be...
62
01:30Application of Integration: Problem Solving
92
The process of breathing involves the periodic intake and expulsion of air, known as the respiratory cycle, which typically lasts about five seconds. Modeling the volume of air inhaled into the lungs as a function of time provides insight into both the dynamics and efficiency of pulmonary ventilation. This volume is determined by integrating the airflow rate over time, which captures the cumulative effect of air entering the lungs.Sinusoidal Model of AirflowAirflow during respiration is not...
92
01:30Applications of Integration to Find Hydrostatic Pressure
63
Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
63
01:30Applications of Integration to Find Centers of Mass
73
Rotational equilibrium provides a natural framework for defining the center of mass of a system. For a plank balanced on a pivot with two unequal masses, equilibrium is achieved when the net torque about the pivot is zero. Torque is defined as the product of a force and its perpendicular distance from the pivot. When the torques due to all forces cancel, the pivot coincides with the center of mass of the system.For a system composed of several discrete point masses, the center of mass lies at...
73
01:27Applications of Integration to Find Blood Flow
45
Blood flow through a cylindrical blood vessel can be mathematically described using the principles of laminar flow, a regime in which fluid moves smoothly in parallel layers. In this model, the velocity of the blood is not uniform across the cross-section of the vessel; rather, it varies with the radial distance from the center. The maximum velocity occurs along the central axis, decreasing progressively toward the vessel walls, where it reaches zero due to viscous drag.Approximating Blood...
45