For the time being, a number of humidity measurement
instruments
made of a variety of different materials and operating on a number
of different principles are accessible. There are numerous ways that
may be utilized to categorize them. I begin by discussing the most
commonly used designs for flexible humidity sensors. Following that,
the section on humidity-sensitive materials, the sensing mechanism,
the major properties of humidity sensors, and the influence of temperature
on humidity sensors are discussed. The study concludes with a review
of current research in this area, as well as the challenges that exist.
The majority of the studies included in this review were published
between 2020 and 2022. These remarks are expected to serve as an overview
to humidity measurement for researchers and graduate students who
are new to the field or who are already working in it and would like
to learn more about the issue.
This paper presents the production and the characterization of the multi-walled carbon nanotube (MWCNT) printed flexible temperature sensors for high-precision reading in temperature sensing applications. The temperature sensor was fabricated using the inkjet printing method by depositing carbon nanotube (CNT) ink on soft taffeta fabric. An aqueous CNT-based conductive ink was formulated for the inkjet printing process. A translucent polyurethane (PU) welding tape was used as an encapsulation layer on the surface of the sensors to protect sensors from various environmental effects during usage and testing. The fabricated sensors function as thermistors, as the conductivity increases with temperature linearly. The performances of differently patterned three temperature sensors were compared. The highest obtained temperature coefficient of resistance (TCR) and the thermal index are -1.04%/°C and 1135 K, respectively. The fabricated sensors possess a high-temperature sensitivity between room temperature and 50 °C and perform better than the typical commercial platinum temperature sensors and most of the recently reported CNT-based temperature sensors in the literature.
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