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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Humidity Sensors with Shielding Electrode Under Interdigitated Electrode.

Hong Liu1, Qi Wang2, Wenjie Sheng3

  • 1ASIC and System State Key Lab, Department of Microelectronics, Fudan University, Shanghai 200433, China. 16210720074@fudan.edu.cn.

Sensors (Basel, Switzerland)
|February 10, 2019
PubMed
Summary
This summary is machine-generated.

A novel capacitive humidity sensor with a shielding electrode under the interdigitated electrode (SIDE) offers high sensitivity and fast response. This polyimide-based sensor shows excellent agreement between simulation and experimental results for various applications.

Keywords:
IDEPISIDEcapacitivehumidity sensor

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Humidity sensors are crucial for applications in chip fabrication, healthcare, and agriculture.
  • Existing capacitive sensors have trade-offs between sensitivity and response time.

Purpose of the Study:

  • To propose and characterize a novel capacitive humidity sensor with a shielding electrode under the interdigitated electrode (SIDE).
  • To enhance sensor performance by combining high sensitivity and fast response times.

Main Methods:

  • Design and optimization of the SIDE structure using COMSOL Multiphysics.
  • Fabrication of the polyimide-based capacitive humidity sensor.
  • Experimental validation of the sensor's performance against simulation data.

Main Results:

  • The SIDE sensor demonstrated a sensitivity of 0.0063% ± 0.0002% RH.
  • Achieved rapid response and recovery times of 20 s and 22 s, respectively.
  • Exhibited a maximum capacitance drift of 1.28% RH across different relative humidity levels.

Conclusions:

  • The proposed SIDE capacitive humidity sensor effectively integrates high sensitivity and fast response.
  • The shielding electrode design significantly improves sensor performance.
  • Experimental results validate the simulation, confirming the sensor's potential for practical applications.