Wide range high speed relative humidity sensor based on PEDOT:PSS–PVA composite on an IDT printed on piezoelectric substrate

Choi, Kyung Hyun; Sajid, Memoon; Aziz, Shahid; Yang, Bong-Su

doi:10.1016/j.sna.2015.03.003

Cited by 76 publications

(43 citation statements)

References 27 publications

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“…In addition, the influence of humidity on PVA/PEMA iongel-gated transistors was tested. [44] However, in our results, the humidity influence has only minor impact on the transistor performance between 20% and 90% relative humidity. [2,11,42] However, Marques et al identified that CSPE easily loses the ionic conductivity at lower relative humidity (RH) ranges (≤20%).…”

Section: Resultscontrasting

confidence: 50%

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

Jeong

Marques

Feng

et al. 2019

Adv Materials Inter

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voltages for operation [1][2][3][4][5][6][7] and remarkable progress has been made in the development of semiconducting channel materials [8][9][10][11] and gate insulators. [12][13][14] The EGTs are switched on/off by applying a gate potential, which leads to a migration and local redistribution of ions at the semiconductor/electrolyte interfaces. The formed electric double layer (EDL) generates high charge accumulation in the adjacent semiconducting channel, which, for instance, renders the channel conductive at a certain gate potential. For this reason, it is important for gate insulators to show high ionic conductivities, in order to quickly develop strong EDLs that improve the EGT performance. However, the switching speed of EGTs, which is slower than that for dielectric gating, is still considered as a technical hurdle for practical applications. Therefore, various types of advanced polymer electrolytes have been intensively studied.A different approach has been established in the last few years, where an ion-gel, consisting of an ionic liquid and a poly mer, is used as a gate insulator in EGTs. [14][15][16] This approach makes use of the intrinsic properties of ionic liquids, such as high ionic conductivities, negligible volatility, and Electrolyte-gated transistors (EGTs) represent an interesting alternative to conventional dielectric-gating to reduce the required high supply voltage for printed electronic applications. Here, a type of ink-jet printable ion-gel is introduced and optimized to fabricate a chemically crosslinked ion-gel by selfassembled gelation, without additional crosslinking processes, e.g., UV-curing. For the self-assembled gelation, poly(vinyl alcohol) and poly(ethylene-altmaleic anhydride) are used as the polymer backbone and chemical crosslinker, respectively, and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf ]) is utilized as an ionic species to ensure ionic conductivity. The as-synthesized ion-gel exhibits an ionic conductivity of ≈5 mS cm −1 and an effective capacitance of 5.4 µF cm −2 at 1 Hz. The ion-gel is successfully employed in EGTs with an indium oxide (In 2 O 3 ) channel, which shows on/offratios of up to 1.3 × 10 6 and a subthreshold swing of 80.62 mV dec −1 .

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Section: Resultscontrasting

confidence: 50%

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

Jeong

Marques

Feng

et al. 2019

Adv Materials Inter

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“…The same IDT used to produce surface acoustic waves was used as the IDT for the fabrication of humidity sensor. Using a piezoelectric substrate and a high frequency IDT for humidity sensing gives additional advantages of fast recovery times of the sensors as explained in our previous work 34 . To compare the response of sensor fabricated using SAW-EHDA, another sensor was also fabricated with the active layer deposited using spin coating.…”

Section: Discussionmentioning

confidence: 99%

“…The response of spin coated sample was also recorded at 1 kHz test frequency (best results) and was compared with that of SAW-EHDA sample. The response and recovery time graphs were also recorded using the breath detection system as mentioned in our previous research work 34 . Figure 7 shows the results and comparison of both types of sensors in terms of measurement efficiency and also response and recovery time graphs.…”

Section: Discussionmentioning

confidence: 99%

Hybrid Surface Acoustic Wave- Electrohydrodynamic Atomization (SAW-EHDA) For the Development of Functional Thin Films

Choi

Kim

Ali

et al. 2015

Sci Rep

Self Cite

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Conventional surface acoustic wave - electrostatic deposition (SAW-ED) technology is struggling to compete with other thin film fabrication technologies because of its limitation in atomizing high density solutions or solutions with strong inter-particle bonding that requires very high frequency (100 MHz) and power. In this study, a hybrid surface acoustic wave - electrohydrodynamic atomization (SAW-EHDA) system has been introduced to overcome this problem by integrating EHDA with SAW to achieve the deposition of different types of conductive inks at lower frequency (19.8 MHZ) and power. Three materials, Poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene] (MEH-PPV), Zinc Oxide (ZnO), and Poly(3, 4-ethylenedioxythiophene):Polystyrene Sulfonate (PEDOT:PSS) have been successfully deposited as thin films through the hybrid SAW-EHDA. The films showed good morphological, chemical, electrical, and optical characteristics. To further evaluate the characteristics of deposited films, a humidity sensor was fabricated with active layer of PEDOT:PSS deposited using the SAW-EHDA system. The response of sensor was outstanding and much better when compared to similar sensors fabricated using other manufacturing techniques. The results of the device and the films’ characteristics suggest that the hybrid SAW-EHDA technology has high potential to efficiently produce wide variety of thin films and thus predict its promising future in certain areas of printed electronics.

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“…Then, the mixed solution was stirred at ambient temperature for 2 h to ensure the homogenous dispersion of PEDOT-PSS. The parameters were selected on the basis of the optimization procedure presented in a previous study (Chotimah et al, 2016). Then, the mixed solution was transferred into a 10 mL plastic syringe for the electrospinning process.…”

Section: Methodsmentioning

confidence: 99%

Quartz crystal microbalance coated with PEDOT–PSS/PVA nanofiber for a high-performance humidity sensor

Julian

Rianjanu

Hidayat

et al. 2019

J. Sens. Sens. Syst.

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Abstract. Quartz crystal microbalance (QCM) coated with poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate mixed with polyvinyl alcohol (PEDOT–PSS/PVA) nanofiber has been fabricated as a humidity sensor using the electrospinning method. Three types of PEDOT–PSS/PVA nanofiber sensors are fabricated with different needle-to-collector electrospinning distances. The scanning electron microscope images confirm the presence of beads in the nanofiber structure. The results show that the sensor mass deposition increased with the decrease in needle-to-collector distance. The best sensor performance is exhibited by the sample with medium needle-to-collector distance (QCM NF 2). The QCM NF 2 nanofiber sensor shows excellent sensitivity of up to 33.56 Hz per percentage point of relative humidity, with rapid response (5.6 s) and recovery (3.5 s) times, good linearity, excellent repeatability, low hysteresis, and long-term stability and response. The QCM PEDOT–PSS/PVA nanofiber sensor provides a simple method to fabricate high-performance humidity sensors.

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Wide range high speed relative humidity sensor based on PEDOT:PSS–PVA composite on an IDT printed on piezoelectric substrate

Cited by 76 publications

References 27 publications

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

Hybrid Surface Acoustic Wave- Electrohydrodynamic Atomization (SAW-EHDA) For the Development of Functional Thin Films

Quartz crystal microbalance coated with PEDOT–PSS/PVA nanofiber for a high-performance humidity sensor

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