TY - JOUR
T1 - CVD growth of self-assembled 2D and 1D WS2 nanomaterials for the ultrasensitive detection of NO2
AU - Alagh, Aanchal
AU - Annanouch, Fatima Ezahra
AU - Umek, Polona
AU - Bittencourt, Carla
AU - Sierra-Castillo, Ayrton
AU - Haye, Emile
AU - Colomer, Jean François
AU - Llobet, Eduard
N1 - Funding Information:
Funded in part by the Marie Skłodowska-Curie Actions (MSCA) Research and Innovation Staff Exchange (RISE) H2020-MSCA-RISE-2018- 823895 ‘SENSOFT’, by MICINN and FEDER grant no. RTI2018-101580-I00 and AGAUR grant no. 2017 SGR 418 .
Funding Information:
A.A. is supported by a COFUND project the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 713679 and the Universitat Rovira i Virgili (URV) . The technological SIAM (Synthesis, Irradiation and Analysis of Materials) and Morph’IM platforms from the UNamur are acknowledged for XPS and SEM measurements. C.B. and J.F.C. are Research Associates of the National Funds for Scientific Research (FRS-FNRS, Belgium; E.L. is supported by the Catalan Institute for advanced studies (ICREA) via the 2018 Edition of the ICREA Academia Award.
Publisher Copyright:
© 2020 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Herein, we report for the first time on the facile synthesis of 2D layered WS
2 nanosheets assembled on 1D WS
2 nanostructures by combining the aerosol assisted chemical vapor deposition (AA-CVD) method with H
2-free atmospheric pressure CVD, for an ultrasensitive detection of NO
2. This synthesis strategy allows us a direct integration of the sensing material onto the sensor transducer with high growth yield and uniform coverage. Two different WS
2 morphologies (nanotriangles and nanoflakes) were prepared and investigated. The results show that the assembly of layered WS
2 nanosheets on a 3D architecture leads to an improvement in sensing performance by maintaining a high surface area in an accessible porous network. The sensors fabricated show stable, reproducible and remarkable responses towards NO
2 at ppb concentration levels. The highest sensitivity was recorded for WS
2 NT sensors, with an unprecedented ultra-low detection limit under 5 ppb. Additionally, this material has demonstrated its ability to detect 800 ppb of NO
2 even when operated at room temperature (25 °C). Regarding humidity cross-sensitivity, our WS
2 sensors remain stable and functional for detecting NO
2 at ppb levels (i.e., a moderate response decrease is observed) when ambient humidity is raised to 50%. An 8-month long-term stability study has been conducted, which indicates that WS
2-NT sensors show a very stable response to NO
2 over time.
AB - Herein, we report for the first time on the facile synthesis of 2D layered WS
2 nanosheets assembled on 1D WS
2 nanostructures by combining the aerosol assisted chemical vapor deposition (AA-CVD) method with H
2-free atmospheric pressure CVD, for an ultrasensitive detection of NO
2. This synthesis strategy allows us a direct integration of the sensing material onto the sensor transducer with high growth yield and uniform coverage. Two different WS
2 morphologies (nanotriangles and nanoflakes) were prepared and investigated. The results show that the assembly of layered WS
2 nanosheets on a 3D architecture leads to an improvement in sensing performance by maintaining a high surface area in an accessible porous network. The sensors fabricated show stable, reproducible and remarkable responses towards NO
2 at ppb concentration levels. The highest sensitivity was recorded for WS
2 NT sensors, with an unprecedented ultra-low detection limit under 5 ppb. Additionally, this material has demonstrated its ability to detect 800 ppb of NO
2 even when operated at room temperature (25 °C). Regarding humidity cross-sensitivity, our WS
2 sensors remain stable and functional for detecting NO
2 at ppb levels (i.e., a moderate response decrease is observed) when ambient humidity is raised to 50%. An 8-month long-term stability study has been conducted, which indicates that WS
2-NT sensors show a very stable response to NO
2 over time.
KW - AACVD
KW - CVD
KW - Gas sensor
KW - TMDs
KW - WS
UR - http://www.scopus.com/inward/record.url?scp=85090422133&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2020.128813
DO - 10.1016/j.snb.2020.128813
M3 - Article
VL - 326
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
SN - 0925-4005
M1 - 128813
ER -