Semiconducting single-walled carbon nanotube/graphene van der Waals junctions for highly sensitive all-carbon hybrid humidity sensors

Abstract

All-carbon van der Waals junction humidity sensors exhibit high sensitivity and millisecond response/recovery times due to efficient charge transfer.

Highly Sensitive Humidity Sensors Based on Polyethylene Oxide/CuO/Multi Walled Carbon Nanotubes Composite Nanofibers

“…In some areas of life, continuous humidity monitoring is essential. Therefore, humidity sensors significantly contribute to various sectors including agriculture, chemical and food production, climate control, environmental monitoring and health, as well as various industrial sectors such as electronics, paper, automobile and pharmaceuticals production [ 2 ]. The basic requirements towards the development of excellent and accurate humidity sensors are an exceptionally low hysteresis followed by negligible temperature effect, fast recovery times, thermal stability, long-term durability, resistance to pollutants, low cost and over a wide range sensitivity of RH [ 3 ].…”

Hybrid Films Based on Bilayer Graphene and Single-Walled Carbon Nanotubes: Simulation of Atomic Structure and Study of Electrically Conductive Properties

“…This device on a flexible polyethylene terephthalate substrate demonstrated a high photoresponsivity of ~51 A/W and a fast response time of ~40 ms over the visible wavelength range [ 24 ]. An all-carbon hybrid humidity sensor based on graphene/semiconducting SWCNT van der Waals heterostructures has been developed by Cai et al This sensor demonstrated good reproducibility and high sensitivity of 24% per 1% relative humidity change over a wide range of relative humidity (5 to 80%), as well as a short response/recovery time of 198/110 ms [ 25 ]. A hybrid architecture consisting of SWCNT films coated with platinum and graphene particles has been successfully used as an electrode for detecting H 2 molecules.…”

Tight-binding investigation of the structural and vibrational properties of graphene–single wall carbon nanotube junctions

“…Nano-sized carbon allotropes, specially single-walled carbon nanotubes (SWNTs) and single-layer graphene (SLG), are the most widely studied materials due to their extraordinary mechanical, chemical and optical properties [1][2][3][4][5][6] and their exceptional electronic transport makes them a suitable substitute for active layers in future nanoelectronic devices. [7][8][9][10] Devices based on the hybrid system, combining SWNTs and SLG, have shown great potential in terms of electrical conductivity 11 and mechanical strength, 12 and also have found applications in various elds, such as transparent conducting electrodes, 13,14 active layers in TFTs, 15 humidity and gas sensors, 16 biomedical applications, 17 next generation aromatic compound adsorbents, 18 etc. To improve and tune the desired properties for advanced applications such as transparent electrodes and active layers in TFTs, it is very important to understand the structure of SWNT-SLG junction at the atomic scale and various interactions between the two, which modify the properties of the hybrid nanostructures.…”