Graphene Oxide-Coated Quartz Crystal Microbalance for Bioparticle Detection (A Case Study for Bacillus sp.)

Budianto, Arif; Wardoyo, Arinto Yudi Ponco; Masruroh, Masruroh; Dharmawan, Hari Arief; Hadi, Kasnawi Al; Mardiana, Laili

doi:10.5109/6781066

Cited by 2 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coating process was conducted using a spin coating method (5µL, 500 rotation per minute for 10 s and 2500 rotation per minute for 60 s). The coated QCMs were naturally air-dried inside a vacuum chamber and tested using a frequency counter 26,27) . The surface of the coated QCMs were characterized using a SEM (scanning electron microscope, JEOL-JCM7000).…”

Section: Sensor Preparationmentioning

confidence: 99%

The Effect of Humidity Levels on Carbon Dioxide Gas Concentration Measurement using a Titanium Dioxide-Coated Quartz Crystal Microbalance

Mardiana,

Arinto Yudi Ponco Wardoyo,

Masruroh

et al. 2024

Evergreen

View full text Add to dashboard Cite

Carbon dioxide (CO 2 ) is an odorless and colorless gas in ambient air. Carbon dioxide is one of the greenhouse gases that is related to climate change. Carbon dioxide gas is released by many sources and exhaled by humans and animals in ambient air. Carbon dioxide gas concentration can be measured using several techniques. However, the most important thing is the ability to measure carbon dioxide gas concentration in a high-humidity environment, such as high-cost maintenance, specific operators, sensor replacement, decreased performance, and many others. In line with this, this study aimed to develop a carbon dioxide gas sensor using a quartz crystal microbalance and TiO 2 layer. This study also identified the influence of the humid environment on the sensor's performance. The TiO 2 -coated quartz crystal microbalance sensor was installed inside a box and connected to a frequency counter to measure the frequency shifts. Then, the sensor was exposed to the sample gas (concentration = 10,000 mL/m 3 ) with varied humidity levels: 60%, 69%, 79%, 89%, and 99%. The humidity variations were controlled using a humidity level controller. These sensor evaluations were conducted inside an experimental chamber. The results show that the low humidity levels (60% and 69%) have the fastest response times (1 s). The high humidity levels (89% and 99%) show the slowest response time (6 s). The best accuracy (75%) and sensitivity levels (0.0045 Hz/ppm) are obtained from the low humidity level (60%). It can be concluded that the TiO 2 -coated quartz crystal microbalance sensor can be used as a carbon dioxide gas sensor with a humidity <80%. The humidity level influences the sensitive layer of the sensor due to the existence of water molecules. A lower humidity level, a higher sensor performance.

show abstract

Section: Sensor Preparationmentioning

confidence: 99%

The Effect of Humidity Levels on Carbon Dioxide Gas Concentration Measurement using a Titanium Dioxide-Coated Quartz Crystal Microbalance

Mardiana,

Arinto Yudi Ponco Wardoyo,

Masruroh

et al. 2024

Evergreen

View full text Add to dashboard Cite

show abstract

A Development of a Coarse Particle Concentration Measurement System Using a Crystal-Based Sensor and a Dust Sensor for Air Quality Measurement

Budianto,

Rahayu,

Mardiana

et al. 2024

J. Pendidik. Fis. Teknol.

View full text Add to dashboard Cite

QCM or quartz crystal microbalance is a non static crystal that can be used as a mass sensor. As a piezoelectric crystal, a QCM generates an electrical signal with a specific frequency. The frequency change can be utilized as a frequency counter in a mass measurement system. This study aims to develop a coarse particle sensor system using a QCM and an oscillator circuit. In line with this, this study uses an oscillator circuit and a QCM for a sensor development. Thus, the frequency measurement of the QCM contains an oscillator and a signal conditioner connected to a microcontroller. For this purpose, an Arduino Nano was used as the signal processing, while a QCM was used as a coarse particle sensor and compared to a digital dust sensor (Winsen ZH03). The sensor system was evaluated using a fixed-type crystal connected to an oscillator: 2.5 MHz - 7.2 MHz. Arduino Nano processed the frequency signal generated by the developed oscillator. The results show that the sensor system has a stable output signal compared to the comparator. There is a linear correlation between the frequency measured by the system and the oscilloscope (99.73%). It can be concluded that the sensor system can measure coarse particle concentrations from 32-620 ug/cm3 (frequencies from 2 MHz to 7.2 MHz) with a response time of 1 second. The system has an accuracy of 99% and a resolution of 1 Hz.

show abstract

Graphene Oxide-Coated Quartz Crystal Microbalance for Bioparticle Detection (A Case Study for Bacillus sp.)

Cited by 2 publications

References 39 publications

The Effect of Humidity Levels on Carbon Dioxide Gas Concentration Measurement using a Titanium Dioxide-Coated Quartz Crystal Microbalance

The Effect of Humidity Levels on Carbon Dioxide Gas Concentration Measurement using a Titanium Dioxide-Coated Quartz Crystal Microbalance

A Development of a Coarse Particle Concentration Measurement System Using a Crystal-Based Sensor and a Dust Sensor for Air Quality Measurement

Contact Info

Product

Resources

About