TY - JOUR
T1 - An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture
AU - Surya, Sandeep Goud
AU - Yuvaraja, Saravanan
AU - Varrla, Eswaraiah
AU - Baghini, Maryam Shojaei
AU - Palaparthy, Vinay S.
AU - Salama, Khaled N.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We would like to extend our thanks to the staff of Nanofabrication Core Lab, King Abdullah University of Science and Technology (KAUST), Saudi Arabia for providing his assistance in the project.
PY - 2020/6/29
Y1 - 2020/6/29
N2 - The development of in-situ soil moisture sensors (SMS) with advanced materials is the requirement of the future autonomous agriculture industry. However, an open challenge for these sensors is to control changes in the capacitance rather than resistance while attaining reliability, high performance, scalability and stability. In this work, a series of materials such as Graphite oxide (GO), Molybdenum disulfide (MoS2), Vanadium oxide (V2O5), and Molybdenum oxide (MoO3) are tested in realizing a receptor layer that can efficiently sense soil moisture. Here, we found that MoS2 offers the sensitivity, which is nearly three times higher (1200 pF) than in the case of V2O5 for any given range of soil-moisture content outperforming both GO and MoO3 materials. The corresponding increase in the sensitivities for MoO3, GO, MoS2, and V2O5 are ∼13%, ∼11%, ∼30%, and ∼9% respectively, for a variety of temperature up to 45 °C. A temperature variation of 25 °C to 50 °C showed a minimal increase in the sensitivity response for all the devices. We further demonstrated a record sensitivity of 540% with MoS2 in black soil and the corresponding response time was 65 sec. Finally, the recovery time for the MoS2 sensor is 27 s, which is quite fast.
AB - The development of in-situ soil moisture sensors (SMS) with advanced materials is the requirement of the future autonomous agriculture industry. However, an open challenge for these sensors is to control changes in the capacitance rather than resistance while attaining reliability, high performance, scalability and stability. In this work, a series of materials such as Graphite oxide (GO), Molybdenum disulfide (MoS2), Vanadium oxide (V2O5), and Molybdenum oxide (MoO3) are tested in realizing a receptor layer that can efficiently sense soil moisture. Here, we found that MoS2 offers the sensitivity, which is nearly three times higher (1200 pF) than in the case of V2O5 for any given range of soil-moisture content outperforming both GO and MoO3 materials. The corresponding increase in the sensitivities for MoO3, GO, MoS2, and V2O5 are ∼13%, ∼11%, ∼30%, and ∼9% respectively, for a variety of temperature up to 45 °C. A temperature variation of 25 °C to 50 °C showed a minimal increase in the sensitivity response for all the devices. We further demonstrated a record sensitivity of 540% with MoS2 in black soil and the corresponding response time was 65 sec. Finally, the recovery time for the MoS2 sensor is 27 s, which is quite fast.
UR - http://hdl.handle.net/10754/663935
UR - https://linkinghub.elsevier.com/retrieve/pii/S0925400520308881
UR - http://www.scopus.com/inward/record.url?scp=85087669553&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2020.128542
DO - 10.1016/j.snb.2020.128542
M3 - Article
SN - 0925-4005
VL - 321
SP - 128542
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -