Photocurrent Enhancement for Polymer Langmuir−Blodgett Monolayers Containing Ruthenium Complex by Surface Plasmon Resonance

Fukuda, Nobuko; Mitsuishi, Masaya; Aoki, and Atsushi; Miyashita, Tokujı

doi:10.1021/jp014552v

Cited by 60 publications

(35 citation statements)

References 26 publications

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“…Previously, we have found that photocurrent generation based on the polymer LB monolayer containing Ru(bpy) 3 2þ on a silver electrode excited by SPR was enhanced largely compared with far field light irradiation. 90 SPR generation on metal thin film occurs at a critical incident angle of the excitation beam, but, SPR generation on metal nanoparticles requires no special incident angle condition. By far field light irradiation on metal nanoparticle, effective SPR occurs on the surface.…”

Section: Luminescence Enhancement Of Polymer Nano-sheets Under Localimentioning

confidence: 99%

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Mitsuishi

Matsui

Miyashita

2006

Polym J

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ABSTRACT:This review describes recent topics on functional organized molecular assemblies based on ''polymer nano-sheet''. Polymer nano-sheets consisting of amphiphilic poly(alkylacrylamide)s are described as ultrathin polymer Langmuir-Blodgett films through two-dimensional hydrogen networks between polymer backbones, which have been developed to assemble various functional molecules and nanomaterials such as metal and magnetic nanoparticles. Surface modification and nanocoating using fluorinated polymer nano-sheets in confined area are given. Multicolored patterns based on structured color and photopatterning derived from nanostructures are demonstrated. The scope of polymer nano-sheets concerning the bottom-up soft nanodevice is also reviewed. [doi:10.1295/polymj.PJ2006069] KEY WORDS Polymer / Langmuir-Blodgett / Nano-sheet / Thin Film / Acrylamide / Bottom-up approaches for constructing ordered nanoscale structures in organic molecular assemblies are of interest and various techniques for preparation of organic ultrathin films have been extensively studied. Organic thin films are attractive materials for processability, ease of functionalization, light weight, and flexibility. However processing technology on a nanoscale is immature and continuous development is required. Various organic films, for example, a spincoated film, self-assembled monolayers (SAM), 1 polymer brushes, and layer-by-layer alternative adsorption via electrostatic interactions, 2 have been investigated. We have tried to prepare various polymer ultrathin films with the Langmuir-Blodgett (LB) technique. [3][4][5][6] It has been found that N-alkylacrylamide polymer shows highly oriented and well ordered monolayer at the air/water interface. Two-dimensional network of the polymer chains via hydrogen bonding interaction of amide groups on the water surface gives a stable and condensed polymer monolayer (Figure 1). A wide variety of functional molecules were incorporated in the monolayer through copolymerization method 7 and polyion complex method etc. The advantages of the polymer nano-sheet are (1) thermal and mechanical stability, (2) uniform distribution of functional molecules, and (3) ultrathin films at the nanometer scale ranged from 1.0 nm to 2.0 nm and (4) versatile molecular building blocks. Various functional polymer nano-sheets allow fabrication of soft nanodevices based on their integrated assemblies. This review shows the definition and fascinating features of polymer nano-sheets at the first session and describes recent topics of polymer nanoarchitecture based on polymer nano-sheets; fluorination of polymer nanosheets, structured color by three-dimensional nanoassemblies, conductive polymer nano-sheets and molecular logic gates driven by photo-excitation. Hybrid nanomaterials consisting of polymer nano-sheets and metal nanoparticles are also demonstrated for efficient localized surface plasmon resonance utilization. POLYMER NANO-SHEETS BY LANGMUIR-BLODGETT TECHNIQUEThe Langmuir-Blodgett (LB) technique is a powerful means for pre...

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Section: Luminescence Enhancement Of Polymer Nano-sheets Under Localimentioning

confidence: 99%

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Mitsuishi

Matsui

Miyashita

2006

Polym J

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“…As typical examples, electronic excitation of surfaceanchored molecules has been enhanced, as has been verified from the enhancements of fluorescence [1][2][3][4][5][6][7][8] and photocurrent [9][10][11][12] signals. Thus, SPR can offer tremendous advantages in the spectroscopic sensitivity.…”

Section: Introductionmentioning

confidence: 72%

Enhanced Photocurrent Generation in Self‐Assembled Monolayers Formed at Plasmonic Gold Nanostructures

Akiyama

Masato

Sugawa

et al. 2008

Macromolecular Symposia

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Summary: The effect of localized surface plasmon resonance (SPR) appearing at the surfaces of gold nanoparticles (AuPs) was successfully applied for the enhancement of photocurrents from porphyrin (Po) immobilized on AuPs. The electrode consisting of AuPs with different sizes ($15 or $35 nm) was prepared using the AuP film formed at the liquid/liquid interface, and then Po was self-assembled on the gold surface. The SPR effect for the AuP film was verified from the attenuated total reflection SPR and absorption measurements. Photocurrents from the modified electrodes were compared with the corresponding planar electrode. Appreciable enhancement of photocurrents was observed.

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“…Surface plasmon resonance (SPR) measurements were carried out using a homemade apparatus, as described elsewhere. 20 A glass substrate with thermally evaporated gold was used as the deposition substrate for SPR measurements.…”

Section: Methodsmentioning

confidence: 99%

Thickness Dependence of Surface Wettability Change by Photoreactive Polymer Nanosheets

Sultana

Matsui

Mitsuishi

et al. 2008

Polym J

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This paper describes the photochemical surface modification of a solid substrate using a photoreactive polymer nanosheets. A neo-pentylmethacrylamide-co-phenylmethacrylamide (p(nPMA/PhMA)), which has been reported to form a stable monolayer was transferred onto a solid substrate using the Langmuir-Blodgett (LB) technique. The p(nPMA/PhMA) copolymer was deposited with different number of layers onto a solid substrate. Then the wettability change after deep UVirradiation was observed. The water contact angle (CA) of a substrate coated with p(nPMA/PhMA) nanosheet initially shows a value of 80 attributed to alkyl and phenyl side chains of p(nPMA/PhMA). After 30 min irradiation, the water CA of the surface decreases to 14 because of formation of carbonyl groups (COO) of ketone, aldehyde and carboxylic acid from photodecomposition of the nanosheet. The decrease in contact angle depends on number of deposited layers: a thicker film implies smaller surface CA. Results of UV-vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectrscopy (XPS) suggest that more numerous nanosheets produce more oxygen containing species after deep UV irradiation, which implies that the number of the deposited nanosheets can control surface wettability.

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Photocurrent Enhancement for Polymer Langmuir−Blodgett Monolayers Containing Ruthenium Complex by Surface Plasmon Resonance

Cited by 60 publications

References 26 publications

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Enhanced Photocurrent Generation in Self‐Assembled Monolayers Formed at Plasmonic Gold Nanostructures

Thickness Dependence of Surface Wettability Change by Photoreactive Polymer Nanosheets

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