A new mussel-inspired polydopamine phototransistor with high photosensitivity: signal amplification and light-controlled switching properties

Nam, Hye Jin; Cha, Juneho; Lee, Seung Hwan; Yoo, Won Jong; Jung, Dongsoo

doi:10.1039/c3cc48309f

Cited by 62 publications

(48 citation statements)

References 27 publications

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“…in light emitting diodes and fi eld effect transistors. [16][17][18][19][20][21] Recently, we demonstrated that polydopamine (pDA) (or dopamine-melanin), a versatile eumelanin-type polymer with strong adhesion properties, [22][23][24][25][26] displays semiconductor-like properties that can be modifi ed by chemical manipulation. In particular, covalent incorporation of aromatic amines into the pDA structure during polymerization induced a marked shift of the fl at band voltage tuning its intrinsic semiconductor properties to n-type behavior.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth mentioning in this regard a paper reporting insertion of a p-doped pDA thin fi lm with a dense and conformal surface as an optically active channel in OTFT transistors to implement an organic phototransistor with high photosensitivity and photo-controlled switching properties. [ 21 ] An attractive bio-inspired strategy to improve the light response of pDA is based on the incorporation within the pDA scaffold of pheomelanin-type benzothiazine and benzothiazole units that could serve as photosensitizing components. Although pheomelanins exhibit intrinsically poor emission properties with a complex dependence of quantum yields on the excitation energy, they can easily eject electrons upon photoexcitation, as evidenced by free electron laser-photoelectron emission microscopy.…”

Section: Introductionmentioning

confidence: 99%

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A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

Ambrico

Vecchia

Ambrico

et al. 2014

Adv Funct Materials

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

Ambrico

Vecchia

Ambrico

et al. 2014

Adv Funct Materials

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“…Prior to the deposition, each piece of substrates was chemically cleaned using the piranha cleaning procedure. 23 …”

Section: Pre-deposition Cleaning Of Substratesmentioning

confidence: 97%

Synthesis and up/down conversion luminescence properties of Na_0.5R_0.5MoO₄:Ln³⁺ (R³⁺ = La, Gd), (Ln³⁺ = Eu, Tb, Dy, Yb/Er) thin phosphor films grown by pulsed laser deposition technique

Krishnan

Thirumalai

2014

RSC Adv.

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Single crystalline nano thin phosphor films of (Na 0.5 R 0.5 )MoO 4 :Ln 3+ (R 3+ = La, Gd), (Ln 3+ = Eu, Tb, Dy, Yb/Er) have been deposited on the quartz substrates by pulsed laser deposition (PLD) technique. In this work, we clearly explained the target preparation, pre-deposition cleaning of substrates using the piranha cleaning, and optimized growth conditions of thin films. The deposition was carried out using an 10 Nd-YAG laser (λ = 1064 nm) in an ultra-high vacuum (UHV) with an oxygen back pressure of 300 mTorr at different substrate temperature. To examine the crystal structure, 3D surface topography and film thickness, the as-deposited samples were characterized by X-ray diffraction (XRD), atomic force microscope (AFM), scanning electron microscope (SEM), respectively. The thin phosphor films possess scheelite tetragonal crystal structure with the space group I4 1 /a. The down-conversion luminescence 15 properties of Eu 3+ , Tb 3+ , Dy 3+ doped (Na 0.5 R 0.5 )MoO 4 phosphor films were studied in detail. Under 980 nm NIR laser excitation, the Yb 3+ /Er 3+ doped (Na 0.5 R 0.5 )MoO 4 thin films show intense up-converted green emission identified at 524 nm due to the transition from the populated 2 H 11/2 level to 4 I 15/2 ground level of erbium ion. The fluorescence decay time for the major transitions in (Na 0.5 R 0.5 )MoO 4 when doped with Eu 3+ ( 5 D 0 → 7 F 2 ), Tb 3+ ( 5 D 4 → 7 F 5 ), Dy 3+ ( 4 F 9/2 → 6 H 13/2 ) and Yb 3+ /Er 3+ ( 2 H 11/2 → 4 I 15/2 ) are determined and to 20 ensure the color richness, CIE color coordinates were also calculated. The obtained results suggesting that the potential (Na 0.5 R 0.5 )MoO 4 :Ln 3+ thin phosphor films can serve as an excellent material for electro/cathodo-luminescence and display applications.

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“…The surface profi le rootmean-square roughness of the entire area (250 nm × 250 nm) was determined to be 0.46 ± 0.09 nm, comparable with that of dopamine-melanin thin fi lms formed on solid substrates (0.31 nm). [ 18 ] The Fourier transform infrared (FTIR) spectrum of the nanofi lm showed characteristic vibrations of dopamine-melanin: 3307 ( ν (N H), ν (O H)); 3045, 2925 ( ν (C H)); 1597,1490 ( ν ring (C C), ν ring (C N));1433 ( ν ring (C C)); and 1298 cm −1 ( ν ring (CNC)) (Figure 1 d). These signals were consistent with the previous results for dopamine-melanin nanofi lms formed directly on substrate surface, [ 19 ] indicating that the melanin nanofi lms formed via a similar mechanism.…”

Section: Doi: 101002/admi201500203mentioning

confidence: 97%

An Ultrasensitive and Fast Moisture Sensor Based on Self‐Assembled Dopamine–Melanin Thin Films

Wee

Hong

2015

Adv Materials Inter

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biomacromolecule remains a challenge. [ 11 ] Diffi culties associated with the extraction of natural melanin have inspired the development of synthetic melanin, [ 12 ] which can mimic the properties of natural melanin, including its hydrationdependent conducting behavior. For example, the conductivity of 1 mm thick 3,4-dihydroxyphenylalanine (DOPA) melanin pellets was found to be 10 −13 S cm −1 at relative humidity (RH) of 0% and 10 −5 S cm −1 at 100% RH, an eight order of magnitude difference. [ 13 ] Thin fi lms are considered ideal building blocks for constructing miniatured sensing devices due to high surface to volume ratio. However, the preparation of homogeneous melanin thin fi lms at a large scale are extremely diffi cult using conventional solution processing methods due to insolubility of natural and synthetic melanin. [ 6 ] Several attempts have been made to prepare DOPA melanin thin fi lms. For example, ready-made DOPA melanin powders have been used to prepare ammonia-aided melanin aqueous dispersions, which was used to produce DOPA melanin fi lms at a micrometer scale by spin casting. [ 6 ] Synthesized DOPA melanin, soluble in organic solvents such as dimethyl sulfoxide (DMSO) and N , N -dimethyl formamide was also used to produce nanofi lms using spin coating. [ 14 ] A 30 nm thick DOPA melanin nanofi lm spin coated on silicon from DMSO suspension showed about a three order of magnitude change in conductivity on going from 50% RH to 100% RH. [ 15 ] The adhesive proteins secreted by mussels have inspired the design of dopamine-melanin nanofi lms dozens of nanometers thick. [ 16 ] Previous studies have focused mainly on hydration dependence of melanin conductivity (humidity sensitivity), without assessing other parameters critical for practical applications of humidity sensors including response and recovery times, and humidity detection range.This study describes a highly sensitive humidity sensor with rapid response fabricated of self-assembled dopamine-melanin thin fi lms that formed at air/solution interface. These thin fi lms could be transferred to a variety of substrates. Film thickness could be controlled in the nanoscale range by adjusting the reaction times between dopamine monomers and melanin. Examination of the fi lm surface morphology using atomic force microscopy (AFM) showed that the surface was compact and smooth at the nanoscale level. These dopamine-melanin thin fi lm sensor exhibited ultrasensitive and rapid responses to moisture, relatively good reproducibility, and its linear response to RH, allowing their calibration.Dopamine undergoes oxidative polymerization in aqueous solutions in the presence of dissolved oxygen, resulting insoluble melanin aggregates. [ 16 ] In practice, the synthesis of dopamine-melanin starts with deprotonating protonated dopamine (e.g., dopamine hydrochloride), which is chemically stable in air. High-quality melanin thin fi lms were formed at

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A new mussel-inspired polydopamine phototransistor with high photosensitivity: signal amplification and light-controlled switching properties

Abstract: A polydopamine (PDA) thin film with a dense and conformal surface was prepared under optimized deposition conditions using O2 gas as an oxygen source. The PDA-based organic phototransistors exhibited high photosensitivity and photo-controlled switching properties under light illumination.

Cited by 62 publications

References 27 publications

A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

Synthesis and up/down conversion luminescence properties of Na_0.5R_0.5MoO₄:Ln³⁺ (R³⁺ = La, Gd), (Ln³⁺ = Eu, Tb, Dy, Yb/Er) thin phosphor films grown by pulsed laser deposition technique

An Ultrasensitive and Fast Moisture Sensor Based on Self‐Assembled Dopamine–Melanin Thin Films

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A new mussel-inspired polydopamine phototransistor with high photosensitivity: signal amplification and light-controlled switching properties

Abstract: A polydopamine (PDA) thin film with a dense and conformal surface was prepared under optimized deposition conditions using O2 gas as an oxygen source. The PDA-based organic phototransistors exhibited high photosensitivity and photo-controlled switching properties under light illumination.

Cited by 62 publications

References 27 publications

A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

A Photoresponsive Red‐Hair‐Inspired Polydopamine‐Based Copolymer for Hybrid Photocapacitive Sensors

Synthesis and up/down conversion luminescence properties of Na0.5R0.5MoO4:Ln3+ (R3+ = La, Gd), (Ln3+ = Eu, Tb, Dy, Yb/Er) thin phosphor films grown by pulsed laser deposition technique

An Ultrasensitive and Fast Moisture Sensor Based on Self‐Assembled Dopamine–Melanin Thin Films

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Synthesis and up/down conversion luminescence properties of Na_0.5R_0.5MoO₄:Ln³⁺ (R³⁺ = La, Gd), (Ln³⁺ = Eu, Tb, Dy, Yb/Er) thin phosphor films grown by pulsed laser deposition technique