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Electrochemical MoOx/Carbon Nanocomposite Gas Sensor for Formaldehyde Detection at Room Temperature

Alolaywi, Haidar
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596821142716346

Abstract Details

2020, Master of Science, University of Toledo, Chemical Engineering.
The first chapter of this thesis presents a literature review on the different methods employed to synthesize metal oxide semiconductors (MOS) for the detection of formaldehyde (FA) in gas phase. The techniques developed in the last two decades have mostly seek to enhance the sensitivity and selectivity of MOS gas sensors. Most volatile organic compounds (VOC) sensors are based on molybdenum oxide, tin oxide, lanthanum ferrite, zinc oxide, and copper oxide, and here, we compare the performance of MOS gas sensors modified with noble metal nanoparticles, heterostructures of two different MOSs, doped MOS, as well as MOS gas sensors modified with organic-inorganic hybrid materials for high selective formaldehyde detection. Potential areas of improvement and future research directions are also discussed at the end of the chapter. In the second chapter, we focus on the development of a nanocomposite comprised of molybdenum oxide and highly conductive carbon (MoOx/Carbon), which were deposited onto a screen-printed gold electrode (SPGE) to be employed as a gas sensor for the detection of formaldehyde gas. First, the carbon surface was modified by acid treatment to introduce oxygen-containing groups, which promoted the efficient anchorage of MoOx to the carbon surface by using a surface organometallic grafting (SOG) method. Then, once the composite was deposited onto the SPGE, a Nafion layer was added to act as a solid-state ionic electrolyte. Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) were used to verify the carboxylated surface of carbon after the acid treatment. Scanning transmission electron microcopy (STEM) and inductively coupled plasma optical emission spectrometry (ICP-OES) were also employed to confirm the success of the SOG synthesis. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to investigate the interaction of the nanocomposite with formaldehyde at room temperature. The nanocomposite gas sensor demonstrated a greater sensor response to electrical current changes when the formaldehyde concentration increased. Among the different VOCs tested, the composite sensor showed the greatest response of 1.20 μA with 1 ppm FA.
Dong-Shik Kim (Committee Chair)
Ana Alba-Rubio (Committee Co-Chair)
Steve Kim (Committee Member)
79 p.
Chemical Engineering

Recommended Citations

Citations

  • Alolaywi, H. (2020). Electrochemical MoOx/Carbon Nanocomposite Gas Sensor for Formaldehyde Detection at Room Temperature [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596821142716346

    APA Style (7th edition)

  • Alolaywi, Haidar. Electrochemical MoOx/Carbon Nanocomposite Gas Sensor for Formaldehyde Detection at Room Temperature. 2020. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596821142716346.

    MLA Style (8th edition)

  • Alolaywi, Haidar. "Electrochemical MoOx/Carbon Nanocomposite Gas Sensor for Formaldehyde Detection at Room Temperature." Master's thesis, University of Toledo, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1596821142716346

    Chicago Manual of Style (17th edition)

toledo1596821142716346
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This open access ETD is published by University of Toledo and OhioLINK.