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    An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture

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    An infield_1-s2.0-S0925400520308881-main.pdf
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Surya, Sandeep Goud cc
    Yuvaraja, Saravanan
    Varrla, Eswaraiah
    Baghini, Maryam Shojaei
    Palaparthy, Vinay S. cc
    Salama, Khaled N. cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering
    Electrical Engineering Program
    Sensors Lab
    Date
    2020-06-29
    Online Publication Date
    2020-06-29
    Print Publication Date
    2020-10
    Embargo End Date
    2022-06-29
    Submitted Date
    2020-04-22
    Permanent link to this record
    http://hdl.handle.net/10754/663935
    
    Metadata
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    Abstract
    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.
    Citation
    Surya, S., Yuvaraja, S., Varrla, E., Baghini, M. S., Palaparthy, V. S., & Salama, K. N. (2020). An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture. Sensors and Actuators B: Chemical, 128542. doi:10.1016/j.snb.2020.128542
    Sponsors
    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.
    Publisher
    Elsevier BV
    Journal
    Sensors and Actuators B: Chemical
    DOI
    10.1016/j.snb.2020.128542
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0925400520308881
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.snb.2020.128542
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Sensors Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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