Resistive-type Humidity Sensor Based on CA-NH4BF4-PEG600 Thin Films

Harun, N. I.; Ali, R. M.; Ali, Abdul Karim; Yahy, M.Z.A.

doi:10.1016/j.phpro.2012.03.075

Cited by 8 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This refers to parameters such as the layer thickness (or the polymer mass per surface area), lateral homogeneity and wettability, and the dependence of these on process parameters. Further, PEG and PEG-containing layers have been used in a variety of humidity sensors, based on dimensional, electrical, mass, or refractive index changes upon swelling, and there is an interest in the ability to tune the polymer properties to optimize the sensing performance to different applications. Hence, control of the water uptake characteristics of PEG-based polymers supports the informed and systematic development of such sensors.…”

Section: Introductionmentioning

confidence: 99%

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

Ederth

Ekblad

2018

Langmuir

View full text Add to dashboard Cite

Hydrogels are widely used in biomedicine and for bioanalytical purposes, normally under wet conditions. For certain applications, processing steps, or process monitoring, hydrogel films are used or treated under ambient conditions, and because they are hygroscopic, it is of interest to investigate how they respond to changes in atmospheric humidity. We have used neutron reflectometry to follow the swelling of thin UV-polymerized hydrogel films in air under different relative humidities (RHs). These polymers were prepared to similar thicknesses on silica and gold substrates, and the chemical similarity between them was verified by infrared spectroscopy. The swelling in response to variations in RH was different for the layers on the two substrate types, reflecting structural changes induced by differences in the UV exposure required to achieve a given polymer thickness, as demonstrated also by differences in the Flory-Huggins interaction parameter, obtained by fitting a Flory-Huggins-type sorption model to the swelling data. Wetting studies show small changes in contact angles with surrounding humidity variations, indicating that structural reorganization at the interface in response to humidity changes is limited.

show abstract

Section: Introductionmentioning

confidence: 99%

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

Ederth

Ekblad

2018

Langmuir

View full text Add to dashboard Cite

show abstract

“…Various relative humidity sensing techniques have been reported for airborne environmental conditions, including capacitive, resistive, quartz crystal microbalance (QCM), electrochemical, surface acoustic wave (SAW), optical fiber, and field-effect transistor sensors. − Capacitive humidity sensors have been widely utilized because of their high sensitivity and accuracy, and a wide RH detection range . However, process complexity of the sensor structure and high cost caused by complicated signal-processing electronics at the far end of the sensor still remain as challenges to be overcome.…”

mentioning

confidence: 99%

A Highly Sensitive and Stable rGO:MoS₂-Based Chemiresistive Humidity Sensor Directly Insertable to Transformer Insulating Oil Analyzed by Customized Electronic Sensor Interface

et al. 2021

View full text Add to dashboard Cite

Reduced graphene oxide and molybdenum disulfide (rGO:MoS 2 ) are the most representative two-dimensional materials, which are promising for a humidity sensor owing to its high surface area, a large number of active sites, and excellent mechanical flexibility. Herein, we introduced a highly sensitive and stable rGO:MoS 2 -based humidity sensor integrated with a lowpower in-plane microheater and a temperature sensor, directly insertable to transformer insulating oil, and analyzed by a newly developed customized sensor interface electronics to monitor the sensor's output variations in terms of relative humidity (RH) concentration. rGO:MoS 2 sensing materials were synthesized by simple ultrasonication without using any additives or additional heating and selectively deposited on titanium/platinum (Ti/Pt) interdigitated electrodes on a SiO 2 substrate using the drop-casting method. The significant sensing capability of p−n heterojunction formation between rGO and MoS 2 was observed both in the air and transformer insulating oil environment. In air testing, the sensor exhibited an immense sensitivity of 0.973 kΩ/%RH and excellent linearity of ∼0.98 with a change of humidity from 30 to 73 %RH, and a constant resistance deviation with an inaccuracy rate of 0.13% over 400 h of continual measurements. In oil, the sensor showed a high sensitivity of 1.596 kΩ/%RH and stable repeatability for an RH concentration range between 34 and 63 %RH. The obtained results via the sensor interface were very similar to those measured with a digital multimeter, denoting that our developed total sensor system is a very promising candidate for realtime monitoring of the operational status of power transformers.

show abstract

“…Exact and long haul RH estimations will empower a quantitative relationship between admissible H 2 S in sewer air and worthy erosion rates ≤0.5 mm/year. Humidity sensors were realized in different forms constituting capacitive [168], resistive [169,170], electrical resonant [171] and mechanical resonant devices [172]. For measuring humidity, sensitive materials range from polymers to porous ceramics, porous silicon and electrolyte have been used.…”

Section: Fiber Optic Humidity Sensorsmentioning

confidence: 99%

“…Conventional methods for humidity sensing include a mechanical hygrometer [173], chilled mirror hygrometer [174], wet and dry bulb psychrometer [175], Infra Red (IR) optical absorption hygrometer [176] and electronic hygrometer [170]. In a mechanical hygrometer, the humidity is measured with the displacement of the material through strain gauges.…”

Section: Fiber Optic Humidity Sensorsmentioning

confidence: 99%

Review of Fiber Optical Sensors and Its Importance in Sewer Corrosion Factor Analysis

et al. 2021

View full text Add to dashboard Cite

Adverse effects of wastewater on the hygiene of human and circumstances is a major issue in society. Appropriate refining systems with high efficiency is required to treat the wastewater. Sewage treatment plant plays a major and important role in conserving incredible nature of the environment. Microbiologically Induced Corrosion (MIC) is an important phenomenon in sewage structures which causes the deterioration of infrastructures. Huge capital has been spent and efforts have been made on wastewater treatment infrastructure to increase operating efficiency and reliability of compliance. The investments in reimbursement and maintenance of sewer structures upsurge with an increase in the rate of MIC. The focus of this review is to describe MIC in sewer structure and the factors influencing the corrosion such as the generation of Sulfuric acid (H2SO4), Relative Humidity (RH), pH of the concrete structure and temperature. Modern developments in the design of Fiber Optical Sensors (FOSs) for observing the parameters including pH, Hydrogen Sulfide (H2S), RH and temperature will be discussed.

show abstract

Resistive-type Humidity Sensor Based on CA-NH4BF4-PEG600 Thin Films

Cited by 8 publications

References 23 publications

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

A Highly Sensitive and Stable rGO:MoS₂-Based Chemiresistive Humidity Sensor Directly Insertable to Transformer Insulating Oil Analyzed by Customized Electronic Sensor Interface

Review of Fiber Optical Sensors and Its Importance in Sewer Corrosion Factor Analysis

Contact Info

Product

Resources

About

Resistive-type Humidity Sensor Based on CA-NH4BF4-PEG600 Thin Films

Cited by 8 publications

References 23 publications

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

Swelling of Thin Poly(ethylene glycol)-Containing Hydrogel Films in Water Vapor—A Neutron Reflectivity Study

A Highly Sensitive and Stable rGO:MoS2-Based Chemiresistive Humidity Sensor Directly Insertable to Transformer Insulating Oil Analyzed by Customized Electronic Sensor Interface

Review of Fiber Optical Sensors and Its Importance in Sewer Corrosion Factor Analysis

Contact Info

Product

Resources

About

A Highly Sensitive and Stable rGO:MoS₂-Based Chemiresistive Humidity Sensor Directly Insertable to Transformer Insulating Oil Analyzed by Customized Electronic Sensor Interface