Pongampai, Satana

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Pongampai, Satana
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satana.po@kmitl.ac.th

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    Item type:Publication,
    Ultrahigh linear sensitivity of capacitive humidity sensor base on bilayer structure of graphene oxide
    (2019-03-01)
    Pongampai, Satana
    ;
    Pengpad, Puttapon
    ;
    Meananeatra, Rattanawan
    ;
    Chaisriratanakul, Woraphan
    ;
    Thitirungraung, Wisut
    Capacitive humidity sensor is designed on interdigitage electrodes (IDEs) by lithography process for nice humidity absorption and desorption. This paper proposed the IDEs humidity sensor base on bilayers sensing of graphene oxide (GO) structure by dip coating method. Each GO layer is held by covalent-bond forces from adhesive layer. It demonstrates durable of sensing layer material. Raman spectroscopy analysis is exhibited on GO presence and scanning electron microscope (SEM) explored on the GO bilayers structure. The IDEs/GO bilayers humidity sensor demonstrated ultrahigh sensitivity (up to 2014.61%) and linear responses at relative humidity (RH) ranges 10 to 70% while IDEs/GO single layer showed exponential responses. Moreover, it significantly improved on response (12 sec) and recovery times (18sec), a little hysteresis (up to 46.77%) and stable repeatability. Finally, the durable of IDEs/GO bilayers humidity sensor is exhibited by long-term ability measurement (time period 35 days). Therefore, these characteristics of GO bilayers structure base on adhesive layer are clearly demonstrated high performances for alternatively used with humidity sensor applications.
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    Influence of graphene oxide concentration on IDES capacitive humidity sensor response behavior
    (2019-01-01)
    Pongampai, Satana
    ;
    Pengpad, Puttapon
    ;
    Meananeatra, Rattanawan
    ;
    Chaisriratanakul, Woraphan
    ;
    Thitirungraung, Wisut
    —Capacitive type humidity sensor was fabricated on CMOS technology by lithography process base on silicon p-substrate with Nitride passivation layer and designed on interdigitage electrodes (IDEs). This paper proposed the influence of various stock graphene oxide (GO) concentrations on humidity sensor responses behavior by drop coating method. The Raman spectroscopy is demonstrated for GO presence and scanning electron microscope (SEM) is exhibited the GO surface morphologies. The capacitance value is examined under different relative humidity (RH) ranges at 0.30% to 80% RH. The IDEs capacitive humidity sensor shows linear, polynomial and exponential responses behaviors for high, medium and low stock GO concentrations, respectively. The high stock GO concentration is significantly improved all dominant humidity sensor properties, especially the sensitivity at low RH (10%, 20%, 30% and 40% RH) which is improved up to 6683.65%, 2097.27%, 1984.91% and 1465.93%, respectively. Furthermore, it shows linear responses behavior by 0.991 for coefficient of determination of wide RH. Moreover, the IDEs capacitive humidity sensors are comparatively examined response/recovery times, hysteresis as well as repeatability. Finally, high stock GO concentration of humidity sensor is exhibited under various temperature operating ranges (20-50 degree Celsius). It clearly demonstrates for alternative applicability to use on humidity sensor applications.
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    Ultrahigh sensitivity and linearity humidity sensor base on vertical alignment of ZnO nanorods sensing layer
    (2019-03-01)
    Pongampai, Satana
    ;
    Pengpad, Puttapon
    ;
    Meananeatra, Rattanawan
    ;
    Horprathum, Mati
    ;
    Chaisriratanakul, Woraphan
    Capacitive humidity sensor was fabricated on CMOS technology with multiple parallel metals coplanar (interdigitage electrodes, IDEs) by lithography process base on silicon bulk substrate and coated Nickel-gold onto IDEs by electroless method. This paper proposed the IDEs humidity sensor with vertical alignment of zinc oxide (ZnO) nanorods on thick seed layer by sputtering process (IDEs/ZnO nanorods) for high sensitivity. ZnO nanorods structure and morphology were obtained by scanning electron microscope (SEM) and X-Ray diffractometer (XRD), respectively. The humidity sensors were comparatively examined properties before/after sputtering process. We have observed sputtering time for 3.0h with 100 nm thick seed layer effected to optimal vertical alignment of ZnO nanorods (length 480 nm) which shown high sensitivity (up to 1913.83%). Moreover, the IDEs/ZnO nanorods significantly improved on wide ranges relative humidity (30-90 %RH), fast response (up to 42.39%) and a little recovery times (16sec), precise repeatability as well as low hysteresis (18.22%). Finally, it demonstrated long-term stability and also exhibited a temperature dependence.