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

2020 ◽  
Vol 8 (10) ◽  
pp. 3386-3394 ◽  
Author(s):  
Baofang Cai ◽  
Huan Yin ◽  
Tingting Huo ◽  
Jun Ma ◽  
Zengfeng Di ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Carbon Nanotube ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Humidity Sensors ◽  
Single Walled Carbon Nanotube ◽  
Response Recovery ◽  
Highly Sensitive ◽  
Recovery Times ◽  
Efficient Charge

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

Highly selective and sensitive chemoresistive humidity sensors based on rGO/MoS2 van der Waals composites

2018 ◽  
Vol 6 (12) ◽  
pp. 5016-5024 ◽  
Author(s):  
Seo Yun Park ◽  
Yeon Hoo Kim ◽  
Seon Yong Lee ◽  
Woonbae Sohn ◽  
Jung Eun Lee ◽  
...  
Keyword(s):  
Hybrid Composites ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Good Reliability ◽  
Response Recovery

Sensors based on 2D rGO/2D MoS2 van der Waals hybrid composites exhibited high sensitivity, extreme selectivity, fast response/recovery, and good reliability to humidity detection.

scholarly journals SnO2/TiO2 Thin Film n-n Heterostructures of Improved Sensitivity to NO2

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6830
Author(s):  
Piotr Nowak ◽  
Wojciech Maziarz ◽  
Artur Rydosz ◽  
Kazimierz Kowalski ◽  
Magdalena Ziąbka ◽  
...  
Keyword(s):  
Thin Film ◽  
Operating Temperature ◽  
Incidence Geometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Langmuir Blodgett ◽  
Response Recovery ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Recovery Times

Thin-film n-n nanoheterostructures of SnO2/TiO2, highly sensitive to NO2, were obtained in a two-step process: (i) magnetron sputtering, MS followed by (ii) Langmuir-Blodgett, L–B, technique. Thick (200 nm) SnO2 base layers were deposited by MS and subsequently overcoated with a thin and discontinuous TiO2 film by means of L–B. Rutile nanopowder spread over the ethanol/chloroform/water formed a suspension, which was used as a source in L–B method. The morphology, crystallographic and electronic properties of the prepared sensors were studied by scanning electron microscopy, SEM, X-ray diffraction, XRD in glancing incidence geometry, GID, X-ray photoemission spectroscopy, XPS, and uv-vis-nir spectrophotometry, respectively. It was found that amorphous SnO2 films responded to relatively low concentrations of NO2 of about 200 ppb. A change of more than two orders of magnitude in the electrical resistivity upon exposure to NO2 was further enhanced in SnO2/TiO2 n-n nanoheterostructures. The best sensor responses RNO2/R0 were obtained at the lowest operating temperatures of about 120 °C, which is typical for nanomaterials. Response (recovery) times to 400 ppb NO2 were determined as a function of the operating temperature and indicated a significant decrease from 62 (42) s at 123 °C to 12 (19) s at 385 °C A much smaller sensitivity to H2 was observed, which might be advantageous for selective detection of nitrogen oxides. The influence of humidity on the NO2 response was demonstrated to be significantly below 150 °C and systematically decreased upon increase in the operating temperature up to 400 °C.

Sub-Picosecond Carrier Dynamics Induced by Efficient Charge Transfer in MoTe2/WTe2 van der Waals Heterostructures

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9587-9594 ◽  
Author(s):  
Kyusup Lee ◽  
Jie Li ◽  
Liang Cheng ◽  
Junyong Wang ◽  
Dushyant Kumar ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Van Der Waals ◽  
Carrier Dynamics ◽  
Van Der Waals Heterostructures ◽  
Efficient Charge
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