Self-standing chitosan films as dielectrics in organic thin-film transistors

Morgado, Jorge; Pereira, Aricson; Bragança, Ana M.; Ferreira, Quirina; Fernandes, Susana C. M.; Freire, Carmen S.R.; Silvestre, Armando J. D.; Neto, Carlos Pascoal; Alcácer, Luís

doi:10.3144/expresspolymlett.2013.94

Cited by 27 publications

(20 citation statements)

References 17 publications

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“…Chitosan can be transformed into chitin and has the same excellent characteristics, such as biocompatibility, biodegradability, non-toxicity, antimicrobial activity, and an outstanding film-forming ability [16,17,18]. Therefore, in previous studies, chitosan has also been used as dielectric layer in organic transistors [19,20]. Yttrium (III) oxide (Y 2 O 3 ) is a type of rare earth oxide that is non-toxic, thermodynamically stabile, stabile at high temperature (T m = 2430 °C), and has a high dielectric constant (ε = 15~18), light transparency, and a linear transmittance in the infrared spectra.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly and Biodegradable Biopolymer Chitosan/Y2O3 Composite Materials in Flexible Organic Thin-Film Transistors

Singh

et al. 2017

Materials

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Abstract:The waste from semiconductor manufacturing processes causes serious pollution to the environment. In this work, a non-toxic material was developed under room temperature conditions for the fabrication of green electronics. Flexible organic thin-film transistors (OTFTs) on plastic substrates are increasingly in demand due to their high visible transmission and small size for use as displays and wearable devices. This work investigates and analyzes the structured formation of aqueous solutions of the non-toxic and biodegradable biopolymer, chitosan, blended with high-k-value, non-toxic, and biocompatible Y 2 O 3 nanoparticles. Chitosan thin films blended with Y 2 O 3 nanoparticles were adopted as the gate dielectric thin film in OTFTs, and an improvement in the dielectric properties and pinholes was observed. Meanwhile, the on/off current ratio was increased by 100 times, and a low leakage current was observed. In general, the blended chitosan/Y 2 O 3 thin films used as the gate dielectric of OTFTs are non-toxic, environmentally friendly, and operate at low voltages. These OTFTs can be used on surfaces with different curvature radii because of their flexibility.

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Section: Introductionmentioning

confidence: 99%

Eco-Friendly and Biodegradable Biopolymer Chitosan/Y2O3 Composite Materials in Flexible Organic Thin-Film Transistors

Singh

et al. 2017

Materials

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“…This memory is expected to replace the traditional memory technologies due to its advantages such as low cost, high speed, long retention, and fast write/read speed [4][5][6][7][8] . Besides, chitosan plays as a dielectric layer in transistors 9,10 . On the other hand, the influence of film thickness on the characteristics of the resistive switching device based on organic materials has been reported by different groups 11,12 .…”

Section: Introductionmentioning

confidence: 99%

The effect of content and thickness of chitosan thin films on resistive switching characteristics

Doan

Tran

et al. 2020

Sci. Tech. Dev. J.

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Introduction: Nowadays, a resistive switching memory using biological, transparent, and environmentally friendly materials is appreciated as the tendency of science and technology, especially in the field of electronic devices. Chitosan (CS), having dominant characteristics such as non-toxic, biocompatible and large capacity, plays as a switching medium in resistive random access memory devices (RRAM). Methods: In our study, CS film was fabricated onto a commercial substrate (FTO) using a simple spin coating method, and the top electrode (Ag) was deposited by a direct-current sputtering technique. Results: The Ag/CS/FTO devices shown the bipolar switching behavior when applying sequence voltage from -1.5 to 2V with the set process in the negative bias and the reset process in the positive bias. The content (0.2, 0.5, and 0.8 wt%) and thickness (100, 300, 500 nm) of chitosan film significantly affect the resistive switching performance. The devices with 0.5 wt%/v concentration and 300 nm-thickness of CS have shown better efficiency than the others with endurance over 100 sweeping cycles and ON/OFF ratio at ca. 2x10 times. Conclusions: It is found that the chitosan material has a large potential candidate for applications in optoelectronic devices.

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“…Chitosan is the second most abundant biopolymer found on Earth, and is known in bioanalytical science for its capacity in the sorption of divalent metal cations from aqueous solutions . Chitosan has been used in biomedical applications such as bioanalytical biosensors and gene delivery by exploiting its film‐forming ability and its proton exchange characteristics in membranes …”

Section: Introductionmentioning

confidence: 99%

Chemiresistive and Chemicapacitive Devices Formed via Morphology Control of Electroconductive Bio‐nanocomposites

Aggas

Lutkenhaus

Guiseppi‐Elie

2017

Adv Elect Materials

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Chemiresistive and chemicapacitive circuit elements are fashioned from polymer thin films that are bio‐nanocomposites of polyaniline‐chloride (PAn‐Cl) nanofibers within a chitosan (CHI) matrix deposited on microfabricated electrodes (IAME‐co‐IME; 2 µm lines and 1 µm spacing). UV–vis spectroscopy of 0–100 wt% PAn‐Cl/CHI confirms no electronic coupling between PAn and CHI. When aqueous dispersions of the bio‐nanocomposite are slow dried or cast, frozen, and lyophilized, they produce dense (chemiresistive) or highly porous foam (chemicapacitive) membranes. Studied in air, deionized water, and in physiological buffers (PBS and HEPES), four‐band probe measurements of the ionic to polaronic conduction show a conductivity that is composition dependent with a percolation threshold of ≈30 wt%. Cyclic voltammetry reveals all compositions to be electroactive. Electrical impedance spectroscopy (EIS) shows that resistive and capacitive properties can be controlled by composition and morphology with 50–50 wt% being favored. EIS modeling confirms a modified Randles circuit of low chi‐square values (<0.05) that appropriately models the chemiresistive and chemicapacitive properties. DC offset voltages can externally control the predominantly chemiresistive and chemicapacitive properties of the devices for biosensor and biocircuit applications.

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Self-standing chitosan films as dielectrics in organic thin-film transistors

Cited by 27 publications

References 17 publications

Eco-Friendly and Biodegradable Biopolymer Chitosan/Y2O3 Composite Materials in Flexible Organic Thin-Film Transistors

Eco-Friendly and Biodegradable Biopolymer Chitosan/Y2O3 Composite Materials in Flexible Organic Thin-Film Transistors

The effect of content and thickness of chitosan thin films on resistive switching characteristics

Chemiresistive and Chemicapacitive Devices Formed via Morphology Control of Electroconductive Bio‐nanocomposites

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