Fabrication and Formaldehyde-Sensing Property of Quartz Crystal Microbalance (QCM) Coated with PVP-MWCNTs Composites

2015 ◽  
Vol 645-646 ◽  
pp. 719-723 ◽  
Author(s):  
Ying Fei He ◽  
Ya Dong Jiang ◽  
Hui Ling Tai ◽  
Guang Zhong Xie
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Absorption Spectrometry ◽  
Fast Response ◽  
Formaldehyde Concentration ◽  
Multiwalled Carbon ◽  
Low Concentration ◽  
Spray Process ◽  
Formaldehyde Sensing ◽  
Low Concentration Formaldehyde

In this paper, the quartz crystal microbalance (QCM) sensors coated with polyvinyl pyrrolidone (PVP)-multiwalled carbon nanotubes (MCWNTs) nanocomposite thin films were developed by the spray process, which were used for the detection of low concentration formaldehyde at room temperature. The surface morphology and structure of films was analyzed by scanning electron microscope (SEM), UV-Vis absorption spectrometry, respectively, and the formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited the linear characteristic, fast response, good reproducibility to low concentration formaldehyde within 6 ppm, and the poisoning of films was observed when the formaldehyde concentration exceeded 6ppm. Moreover, the sensitivity of the sensor could achieve up to 1Hz/ppm and had the good stability of response values.

A fast-response and highly linear humidity sensor based on quartz crystal microbalance

2019 ◽  
Vol 283 ◽  
pp. 659-665 ◽  
Author(s):  
Xinyu Zheng ◽  
Rongrong Fan ◽  
Chunru Li ◽  
Xingyue Yang ◽  
Huizi Li ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Humidity Sensor ◽  
Quartz Crystal ◽  
Fast Response

Polyacrylamide Coated on Quartz Crystal Microbalance Electrodes for Highly Sensitive Sensor of Acetic Acid

2019 ◽  
Vol 948 ◽  
pp. 254-259
Author(s):  
Ahmad Rizani ◽  
Sulis Setyawati Winingsih ◽  
Aditya Rianjanu ◽  
Trisna Julian ◽  
Shidiq Nur Hidayat ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Quartz Crystal Microbalance ◽  
High Performance ◽  
Quartz Crystal ◽  
High Sensitivity ◽  
Fast Response ◽  
Acid Vapor ◽  
Highly Sensitive ◽  
Assembled Monolayers ◽  
Sensitive Sensor

In many cases, acetic acid is categorized as hazardous to health. A high-performance sensor for detecting acetic acid is urgently required. This study aims to observe the characteristics of quartz crystal microbalance (QCM) coated with polyacrylamide as an acetic acid sensor. For this purpose, we prepared the sensor by firstly coating with 1-dodecanethiol (using self-assembled-monolayers or SAM technique) followed subsequently by glutaraldehyde and polyacrylamide (PAM).As results, the sensors showed less sensitivity to humidity changes, which is one of the basic prerequisites for a stable sensor to an environment. We also obtained that the sensor showed relatively fast response time and high sensitivity to acetic acid vapor of about 96 seconds and 12.9 Hz/(mgL-1), respectively. Further research, however, is still required to improve the sensitivity and specificity by choosing more selective polymers.

In-Line Moisture Monitoring in Semiconductor Process Gases by a Reactive-Metal-Coated Quartz Crystal Microbalance

1997 ◽  
Vol 40 (2) ◽  
pp. 43-48
Author(s):  
Jian Wei ◽  
John Pillion ◽  
Chi Hoang
Keyword(s):  
Quartz Crystal Microbalance ◽  
Distribution System ◽  
Quartz Crystal ◽  
Limit Of Detection ◽  
Fast Response ◽  
Ionization Mass ◽  
Reactive Metal ◽  
Process Gas ◽  
Moisture Detection ◽  
Pressure Ionization Mass Spectrometry

A new in-line sensor for trace moisture monitoring has been developed based on a piezoelectric quartz crystal microbalance (QCM) coated with a reactive metal thin film. The properties of the metal coating and QCM allow the sensor to have fast response and fast recovery to moisture in the process gas stream. The properties of the metal-coated QCM also allow the sensor to be compact so it can be in-line in the gas distribution system and readily integrated into the process tools. This paper presents the principle of moisture detection using this technology. The experimental results of accuracy, limit of detection (< 1 ppb), and error analysis of this sensor in parallel with atmospheric pressure ionization mass spectrometry (APIMS) are presented. The experimental setup and procedures are described. The effect of an upstream gas purifier on its rate of response was also studied and the results are presented and discussed. The applications of this technology in semiconductor processing are briefly mentioned.

Detection of hydrogen peroxide and glucose by enzyme product precipitation on sensor surface

2015 ◽  
Vol 69 (1) ◽  
Author(s):  
Tomáš Juřík ◽  
Petr Skládal
Keyword(s):  
Hydrogen Peroxide ◽  
Horseradish Peroxidase ◽  
Modified Electrode ◽  
Quartz Crystal Microbalance ◽  
Electrode Surface ◽  
Quartz Crystal ◽  
Sensor Surface ◽  
Low Concentration ◽  
Enzyme Product ◽  
Insoluble Product

AbstractBiocatalysed precipitation of an insoluble product accumulated on the enzyme-modified electrode surface was applied as the amplification path for low concentration sensing of hydrogen peroxide and glucose. Sensitive electrochemical and quartz-crystal microbalance (QCM) biosensors based on biocatalytic precipitation were developed. A horseradish peroxidase (HRP) monolayer-modified electrode was used to sense H

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