Nanoporous Functionalized WS2/MWCNTs Nanocomposite for Trimethylamine Detection Based on Quartz Crystal Microbalance Gas Sensor

2021 ◽  
Author(s):  
Qinan Zhou ◽  
Luyi Zhu ◽  
Chengyu Zheng ◽  
Jun Wang
Keyword(s):  
Gas Sensor ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal

Identification and detection of bioactive compounds in turmeric (Curcuma longa L.) using gas sensor array based on molecularly imprinted polymer quartz crystal microbalance

2021 ◽  
Author(s):  
Fajar IAIN Hardoyono ◽  
Kikin Windhani
Keyword(s):  
Gas Sensor ◽  
Bioactive Compounds ◽  
Quartz Crystal Microbalance ◽  
Molecularly Imprinted Polymer ◽  
Quartz Crystal ◽  
Sensor Array ◽  
Curcuma Longa ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Gas Sensor Array

This study aimed to identify four bioactive compounds in turmeric (Curcuma longa L.) using gas sensor array based on molecularly imprinted polymer-quartz crystal microbalance (MIP-QCM). Four QCM sensors coated with...

Measurement of Solvent Vapor Absorption by Polydimethylsiloxane Using Quartz Crystal Microbalance

2008 ◽  
Author(s):  
W. W. F. Leung ◽  
C. Chao ◽  
C. H. Cheng ◽  
K. F. Lei ◽  
D. Ngan ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Gas Sensor ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Specific Area ◽  
Small Mass ◽  
Crystal Oscillator ◽  
Solvent Vapor ◽  
Adsorbed Gas ◽  
Micro Electromechanical System

A new micro-electromechanical system (MEMS) gas sensor has been developed using quartz crystal microbalance (QCM) with adsorbent coated in form of nanofibers on the QCM sensor. The nanofibers with fiber diameter typically around 200–300 nm increases the specific surface area to enhance adsorption. The QCM is made to oscillate at its natural resonance frequency. Upon exposure of the gas sensor to a given gas, the adsorbed gas onto the nanofibers adds a small mass which changes the natural frequency of the oscillation. By detecting the frequency shift due to adsorption of a given gas, the presence of the gas is detected, and by measuring the frequency shift, the amount of gas being adsorbed at a given pressure and temperature is quantified via the Sauerbrey equation [1]. A circuit has been developed to read the frequency shift due to the energy dissipation in the QCM coated with Polydimethylsiloxane (PDMS) nanofibers under the environment of several solvent vapors. The developed circuit includes two crystal oscillator circuits, two QCM’s which are respectively 1MHz reference QCM and a coated QCM, RC filter and AND gates. The results of the frequency shift between the reference QCM and the coated QCM were recorded on the oscilloscope so as to investigate the relationships between the frequency shift and the amount of vapor adsorbed for different gases. Ultimately, Volatile Organic Compounds (VOCs) are the target to be monitored and a MEMS based sensor will be developed similar to the present QCM gas sensor discussed herein. This work provides the feasibility study for using nanofiber coating to enhance the adsorbent specific area and a stand-alone QCM sensor for making measurement.

ITO thin films coated quartz crystal microbalance as gas sensor for NO detection

2002 ◽  
Vol 87 (1) ◽  
pp. 159-167 ◽  
Author(s):  
J. Zhang ◽  
J.Q. Hu ◽  
F.R. Zhu ◽  
H. Gong ◽  
S.J. O’Shea
Keyword(s):  
Thin Films ◽  
Gas Sensor ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Ito Thin Films

Quartz crystal microbalance gas sensor with nanocrystalline diamond sensitive layer

2015 ◽  
Vol 252 (11) ◽  
pp. 2591-2597 ◽  
Author(s):  
M. Varga ◽  
A. Laposa ◽  
P. Kulha ◽  
J. Kroutil ◽  
M. Husak ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Nanocrystalline Diamond ◽  
Sensitive Layer

Fabrication of Diamond Based Quartz Crystal Microbalance Gas Sensor

2014 ◽  
Vol 605 ◽  
pp. 589-592 ◽  
Author(s):  
Marián Varga ◽  
Alexandr Laposa ◽  
Pavel Kulha ◽  
Marina Davydova ◽  
Jiri Kroutil ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Quartz Crystal Microbalance ◽  
Room Temperature ◽  
Quartz Crystal ◽  
Microwave Plasma ◽  
Natural Diamond ◽  
Chemical Vapor ◽  
Mass Sensor ◽  
Mass Sensors ◽  
Optical Mirrors

Synthetic diamond has remarkable properties comparable with natural diamond and hence is a very promising material for many various applications (sensors, heat sink, optical mirrors, cold cathode, tissue engineering, etc.). Nowadays, deposition of diamond films is normally employed in chemical vapor deposition (CVD) usually at high temperatures (800900 °C), what limit its application to high melting substrates. Gravimetric (mass) sensors belong to the major categories of chemical sensors and the most common type of mass sensor is the bulk acoustic quartz crystal microbalance (QCM). This contribution deals with a nanocrystalline diamond (NCD) growth from the H2/CH4/CO2gas mixture at low temperature (400 °C) by pulsed linear antenna microwave plasma system on 10 MHz circular AT-cut quartz resonators substrate. Gas sensor based on the NCD-coated QCM was developed for detection of ammonia (NH3) at room temperature. Measurements not only confirmed the functionality of this first published NCD-coated QCM sensor, but in addition its sensitivity was twofold to a virgin QCM sensor with a gold active layer.

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