CNTs/ZnO and CNTs/ZnO/Ag multilayers spray coated on cellulose fiber for use as an efficient humidity sensor

Kalim, Babar; Ansar, Muhammad Tamoor; Ullah, Zaka; Abbas, S. Kumail; Riaz, Saira; Siddiqi, Saadat Anwar; Atiq, Shahid

doi:10.1016/j.ceramint.2020.07.031

Cited by 13 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another superior characteristic of polymer-based humidity sensors is compatibility with other sensing materials. By integrating a sensing material onto a polymer substrate such as cellulose [ 84 , 85 , 86 , 87 , 88 , 89 , 90 ] or PET [ 82 , 91 ] using the PVD, CVD or solution methods, it is able to enable the high-strength materials to achieve flexible characteristics. Table 2 lists several different sensing materials with polymer-based substrates [ 82 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 ].…”

Section: Humidity Nanosensorsmentioning

confidence: 99%

Advances in Humidity Nanosensors and Their Application: Review

Chung

2023

Sensors

View full text Add to dashboard Cite

As the technology revolution and industrialization have flourished in the last few decades, the development of humidity nanosensors has become more important for the detection and control of humidity in the industry production line, food preservation, chemistry, agriculture and environmental monitoring. The new nanostructured materials and fabrication in nanosensors are linked to better sensor performance, especially for superior humidity sensing, following the intensive research into the design and synthesis of nanomaterials in the last few years. Various nanomaterials, such as ceramics, polymers, semiconductor and sulfide, carbon-based, triboelectrical nanogenerator (TENG), and MXene, have been studied for their potential ability to sense humidity with structures of nanowires, nanotubes, nanopores, and monolayers. These nanosensors have been synthesized via a wide range of processes, including solution synthesis, anodization, physical vapor deposition (PVD), or chemical vapor deposition (CVD). The sensing mechanism, process improvement and nanostructure modulation of different types of materials are mostly inexhaustible, but they are all inseparable from the goals of the effective response, high sensitivity and low response–recovery time of humidity sensors. In this review, we focus on the sensing mechanism of direct and indirect sensing, various fabrication methods, nanomaterial geometry and recent advances in humidity nanosensors. Various types of capacitive, resistive and optical humidity nanosensors are introduced, alongside illustration of the properties and nanostructures of various materials. The similarities and differences of the humidity-sensitive mechanisms of different types of materials are summarized. Applications such as IoT, and the environmental and human-body monitoring of nanosensors are the development trends for futures advancements.

show abstract

Section: Humidity Nanosensorsmentioning

confidence: 99%

Advances in Humidity Nanosensors and Their Application: Review

Chung

2023

Sensors

View full text Add to dashboard Cite

show abstract

“…As a humidity detection device, humidity sensors have attracted a large amount of research effort because of their wide applications in the field of wearable devices, 1,2 electronic skin, 3,4 non-contact control systems, 5,6 intelligent health monitoring, 7,8 and weather monitoring and forecasting. 9 Moreover, a large number of carbon nanomaterials, i.e., carbon nanotubes (CNTs), [10][11][12] graphene-oxide (GO), [13][14][15] graphite, 16 and carbon ink, 17 have been used as humidity sensing media owning to their high conductivity, electrical sensitivity and chemical stability. Due to the fragility of some humidity sensing materials and the lack of free-standing structures, it is necessary to use flexible substrates to support these humidity sensing materials.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a large number of carbon nanomaterials, i.e. , carbon nanotubes (CNTs), 10–12 graphene-oxide (GO), 13–15 graphite, 16 and carbon ink, 17 have been used as humidity sensing media owning to their high conductivity, electrical sensitivity and chemical stability. Due to the fragility of some humidity sensing materials and the lack of free-standing structures, it is necessary to use flexible substrates to support these humidity sensing materials.…”

Section: Introductionmentioning

confidence: 99%

A flexible tissue–carbon nanocoil–carbon nanotube-based humidity sensor with high performance and durability

Zhang

Yang

et al. 2022

Nanoscale

View full text Add to dashboard Cite

show abstract

“…Based on the information presented above, semiconducting metal oxides and nanocarbonic materials can form promising nanocomposites used as sensing layers for manufacturing high-performance RH sensors. Nanocomposites including SnO 2 and reduced graphene oxide [62], or multiwall carbon nanotubes [63], as well as nanocomposites of ZnO with graphene oxide [64,65], carbon nanotubes [66,67], or graphene quantum dots [68] may be included in this category.…”

Section: Introductionmentioning

confidence: 99%

Quaternary Holey Carbon Nanohorns/SnO2/ZnO/PVP Nano-Hybrid as Sensing Element for Resistive-Type Humidity Sensor

et al. 2021

View full text Add to dashboard Cite

In this study, a resistive humidity sensor for moisture detection at room temperature is presented. The thin film proposed as a critical sensing element is based on a quaternary hybrid nanocomposite CNHox//SnO2/ZnO/PVP (oxidated carbon nanohorns–tin oxide–zinc oxide–polyvinylpyrrolidone) at the w/w/w/w ratios of 1.5/1/1/1 and 3/1/1/1. The sensing structure consists of a Si/SiO2 dielectric substrate and interdigitated transducers (IDT) electrodes, while the sensing film layer is deposited through the drop-casting method. Morphology and composition of the sensing layers were investigated through scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction, and Raman spectroscopy. Each quaternary hybrid nanocomposite-based thin film’s relative humidity (RH) sensing capability was analyzed by applying a direct current with known intensity between two electrodes and measuring the voltage difference when varying the RH from 0% to 100% in a humid nitrogen atmosphere. While the sensor with CNHox/SnO2/ZnO/PVP at 1.5/1/1/1 as the sensing layer has the better performance in terms of sensitivity, the structure employing CNHox//SnO2/ ZnO/PVP at 3/1/1/1 (mass ratio) as the sensing layer has a better performance in terms of linearity. The contribution of each component of the quaternary hybrid nanocomposites to the sensing performance is discussed in relation to their physical and chemical properties. Several alternative sensing mechanisms were taken into consideration and discussed. Based on the measured sensing results, we presume that the impact of the p-type semiconductor behavior of CNHox, in conjunction with the swelling of the hydrophilic polymer, is dominant and leads to the overall increasing resistance of the sensing film.

show abstract

CNTs/ZnO and CNTs/ZnO/Ag multilayers spray coated on cellulose fiber for use as an efficient humidity sensor

Cited by 13 publications

References 22 publications

Advances in Humidity Nanosensors and Their Application: Review

Advances in Humidity Nanosensors and Their Application: Review

A flexible tissue–carbon nanocoil–carbon nanotube-based humidity sensor with high performance and durability

Quaternary Holey Carbon Nanohorns/SnO2/ZnO/PVP Nano-Hybrid as Sensing Element for Resistive-Type Humidity Sensor

Contact Info

Product

Resources

About