Photochemical attachment of polyelectrolyte membrane to electrode substrate and their humidity-sensitive properties

Han, Dae-Sang; Gong, Myoung‐Seon

doi:10.1016/j.snb.2010.03.022

Cited by 19 publications

(9 citation statements)

References 42 publications

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“…4,5,[9][10][11][12][13][14] The thickness of the polyelectrolyte closely affects the humidity sensitivities, such as hysteresis and response or recovery time. 15,16 In addition, IDEs-type humidity sensors exhibited a significant change in impedance with a change in the number of fingers and gap size between electrode fingers, which are related to the design of the electrode.…”

Section: -29mentioning

confidence: 99%

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Cha¹,

Gong²

2013

Bulletin of the Korean Chemical Society

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We examined the effect of electrode fingers and gaps of coplanar interdigitated electrode (IDE) structures to characterize the ammonium salt-containing polyelectrolyte film of resistance-based humidity sensors. IDEs designed for this purpose were flexible gold electrodes deposited on a polyimide substrate using a printing process because the geometry presents a potential for tunable sensitivity over other electrode designs. The basic design of the sensors consisted of IDEs with a different number of electrode fingers such as 3, 4, and 5 and gap sizes of 310, 360, 410, and 460 µm. Details of the AC complex impedance characteristics such as the Nyquist plot, Bode plot, and activation energy based on electrode construction were investigated.

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Section: -29mentioning

confidence: 99%

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Cha¹,

Gong²

2013

Bulletin of the Korean Chemical Society

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“…It is now well established that exposing BP and a suitable reductant such as hydroxyethyl in HEA to UV light will result in the reduction of the electronically excited BP molecules to form hydroxydiphenylmethyl radicals and the concomitant oxidation of the reductant. 29,[34][35] The possible photocrosslinking sites were the hydroxyl group in HEA, the benzyl protons in ST and the tertiary protons from AETAC and HEA in the copolymer chains. The resulting hydroxydiphenylmethyl radicals can then undergo several possible subsequent competing reactions, including hydrogen abstraction and the coupling reaction to form a crosslinked polymer.…”

Section: Preparation Of Polymeric Surface Anchoring Agentmentioning

confidence: 99%

“…[25][26][27][28] A few studies on the photocurable anchoring of the polyelectrolyte to the surface of the electrode substrate for the durability in water were reported. [27][28][29][30][31][32][33][34][35] Photoinduced crosslinking is rapidly expanding technology on pressure-sensitive adhesive, printing ink, photoresist and biomaterials resulting from its main advantages such as solvent-free process, efficient and economical energy used and new properties and quality of chemical crosslinking. [36][37][38][39] This technology is applied to a self-crosslinkable polymer system suitable for absorbing light radiation of the appropriate wavelength and producing primary radical species in order to attach a polymer layer into a solid substrate.…”

Section: Introductionmentioning

confidence: 99%

Photochemical anchoring of polyelectrolyte to the electrode surface using polymeric silane-coupling agents and their water durability

Han

Gong

2011

Macromol. Res.

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This paper reports a simple effective way to photochemically attach a polyelectrolyte layer to an electrode substrate. The system is based on photoreactive benzophenone (BP)-containing copolymers that are bound to alumina surfaces via an alkoxysilane coupling reaction. The alumina substrate was then covered with a BP film that can be reacted with the polyelectrolyte by irradiation with UV light. As a result of the photochemical reaction, the polyelectrolyte was bound covalently to the electrode surfaces. As an example, a thin layer of copolymer of [2-(acryloyloxy)ethyl]trimethyl ammonium chloride (AETAC), styrene (ST), 2-hydroxyethylacrylate (HEA), and 4-acryloxybenzophenone (BPA) (AETAC/ST/HEA/BPA=60/33/4/3) was attached successfully. A pretreatment of the substrate with BP-containing polymeric silane-coupling reagents, AETAC/3-(trimethoxysilyl)propyl methacrylate (TMSPM)/HEA/BPA=50/30/10/10 or TMSPM/HEA/BPA=50/25/25, was performed to improve the water durability and stability at high temperatures and humidity. Their water durability, high temperature/humidity stabilities and long-term stability were evaluated to confirm their usefulness as a humidity-sensing polyelectrolyte membrane.

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“…[21][22][23][24][25][26] Their ionic moieties, such as cationic, anionic, and amphoteric, and their counter ions were directly related to sensitivity. 2,7,[27][28][29][30][31][32][33][34] In addition, the thickness of the humid membrane closely affects the humidity sensitivities, such as hysteresis and response time or recovery time. 35,36 The sensing characteristics of these humidity sensors are also dependent on the electrode gap size, which is related to the design of the electrode.…”

Section: Introductionmentioning

confidence: 99%

Preparation of flexible resistive humidity sensors with different electrode gaps by screen printing and their humidity-sensing properties

Ahn

Kim

Gong³

2012

Macromol. Res.

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A novel, flexible resistive-type humidity sensor was fabricated through silk-screen printing of a humiditysensitive copolymer of [2-(methacryloyloxy)ethyl] dimethyl benzyl ammonium chloride and methyl methacrylate on a glass epoxy (GE) substrate. The basic structure of the sensor consisted of a 4-fingered interdigital electrode with various gaps (310, 360, 410, and 460 µm). Gold electrodes GE substrate were prepared by first printing silver nanopaste (thickness 6-7 µm), followed by consecutive electroless plating of Cu (5 µm), Ni (2 µm), and then Au (80 nm). The activation energy for ion conduction and the copolymer/substrate interface were used to explain the differences of humidity-sensing characteristics of sensors fabricated on a GE substrate. Electrode construction had a significant influence on the humidity-sensing characteristics of polymeric relative humidity sensors. Details regarding humidity sensor characteristics, including sensitivity, linearity, temperature dependence, hysteresis, and response time depending on electrode construction were compared. The flexible humidity sensor showed acceptable linearity between logarithmic impedance and relative humidity in the range of 20-95%RH, low hysteresis (within 1.5%RH), good response (75 s) and recovery time (95 s), and long-term stability (225 days at least), measured at 1 V, 1 kHz, and 25 o C.

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Photochemical attachment of polyelectrolyte membrane to electrode substrate and their humidity-sensitive properties

Cited by 19 publications

References 42 publications

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Photochemical anchoring of polyelectrolyte to the electrode surface using polymeric silane-coupling agents and their water durability

Preparation of flexible resistive humidity sensors with different electrode gaps by screen printing and their humidity-sensing properties

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