Enhanced One-Photon Cycloreversion Reaction of Diarylethenes near Individual Gold Nanoparticles

Nishi, Hidetaka; Asahi, Tsuyoshi; Kobatake, Seiya

doi:10.1021/jp111807k

Cited by 39 publications

(70 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gold nanoparticles (AuNPs) have long been generally employed as PA‐imaging contrast agents due to the LSPR effect, which allows their adjustable and excellent optical absorption . In addition, AuNPs can attain high photothermal conversion effect upon laser illumination and are highly biocompatible, have good chemical inertness, excellent physiochemical properties, and a high extinction coefficient . AuNPs have been synthesized as nanorods, nanoprisms, nanocages, nanospheres, nanostars, nanodisks, bipyramids and rhombic dodecahedra, nanoplates, nanoshells, nanotripods, and nanowreaths …”

Section: Inorganic Contrast Agentsmentioning

confidence: 99%

Photoacoustic Imaging: Contrast Agents and Their Biomedical Applications

et al. 2018

View full text Add to dashboard Cite

Photoacoustic (PA) imaging as a fast‐developing imaging technique has great potential in biomedical and clinical applications. It is a noninvasive imaging modality that depends on the light‐absorption coefficient of the imaged tissue and the injected PA‐imaging contrast agents. Furthermore, PA imaging provides superb contrast, super spatial resolution, and high penetrability and sensitivity to tissue functional characteristics by detecting the acoustic wave to construct PA images. In recent years, a series of PA‐imaging contrast agents are developed to improve the PA‐imaging performance in biomedical applications. Here, recent progress of PA contrast agents and their biomedical applications are outlined. PA contrast agents are classified according to their components and function, and gold nanocrystals, gold‐nanocrystal assembly, transition‐metal chalcogenides/MXene‐based nanomaterials, carbon‐based nanomaterials, other inorganic imaging agents, small organic molecules, semiconducting polymer nanoparticles, and nonlinear PA‐imaging contrast agents are discussed. The applications of PA contrast agents as biosensors (in the sensing of metal ions, pH, enzymes, temperature, hypoxia, reactive oxygen species, and reactive nitrogen species) and in bioimaging (lymph nodes, vasculature, tumors, and brain tissue) are discussed in detail. Finally, an outlook on the future research and investigation of PA‐imaging contrast agents and their significance in biomedical research is presented.

show abstract

Section: Inorganic Contrast Agentsmentioning

confidence: 99%

Photoacoustic Imaging: Contrast Agents and Their Biomedical Applications

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The position of the absorption band of the local surface plasmon resonance strongly depends on the size of the Au particles [134]. The photocycloreversible reaction is enhanced in the vicinity of the Au nanoparticle [135].…”

Section: Scheme 89mentioning

confidence: 99%

Nanophotochromism

Barachevsky¹

2015

Organic Photonics and Photovoltaics

View full text Add to dashboard Cite

Abstract:The review presents the state-of-the-art analysis of investigations in the field of a new line of research of photochromism -nanophotochromism. The design, properties, and possible applications of photochromic nanoparticles prepared by different methods with the use of photochromic substances (aggregates, host-guest, and polymer systems, solid nanoparticles) as well as core-shell photochromic nanostructures based on polymers, silica, quantum dots, doped upconversion nanocrystals, and Ag, Au, etc. nanoparticles have been reviewed. Keywords: photochromism; photochromic nanoparticles; core-shell photochromic nanoparticles design; photoswitching; aggregates; polymer systems, host-guest systems IntroductionPhotochromism is a very important phenomenon for different applications in photonics. The applications are based on reversible phototransformations of photochromic compounds between two states and changes of their properties that accompany these transformations At present, systems and materials containing photochromic nanopatricles have become highly significant. Among these are nanodimensional particles of photochromic substances, including aggregates, and coreshell systems. As a core, inorganic nanoparticles of gold, silver, metal oxides, quantum dots (QD), and also polymeric nanoparticles are used. The shell consists of photochromic molecules or their aggregates connected to a core surface either chemically or physically. Photochromic nanoparticles with photocontrolled fluorescence arouse a special interest because the fluorescence technique is becoming a leading strategy in biological diagnosis, imaging, and detection applications. This paper is a state-of-the-art review which presents results of studying photochromic nanoparticles including author's own data. The results of earlier research are also surveyed in some other reviews [1][2][3][4][5][6][7][8][9][10][11][12][13]. Photochromic nanoparticles:properties and applications Nanoparticles based on photochromic substances AggregatesThe most known photochromic nanoparticles are aggregates of photochromic organic compounds [14]. These compounds experience reversible photoinduced transformations between two states, Sch. 1A and Sch. 1B. Scheme 1The photoinduced colored merocyanine form B absorbing visible irradiation is formed from a colorless form A as a result of photodissociation of the -C-O-bond of the pyran heterocycle under UV radiation, and this is followed by spontaneous isomerization of the cis-form to the trans one. The colored form B can be converted back to the initial colorless form A upon absorption of visible light or spontaneously during the dark relaxation, which is accelerated by heating.The J-aggregates of nitro-substituted indoline spiropyrans Sch. 2 with long alkyl substituents are of special interest [15].The narrow absorption bands of J-aggregates of these photochromic compounds (Fig. 1) made it possible prepare a specimen of the multilayered optical disk providing freUnauthenticated Download

show abstract

“…In this field of research, the organic unit can be molecules showing different photophysical properties such as fluorescence, photochromism, or Raman scattering. Even if there are fewer published reports, coupling plasmonic nanoparticles with photochromic molecules present many advantages [4,5]. Many different behaviors of this coupling have been observed: it can lead to either (i) a decrease of the photochromic activity [6,7] and even an irreversibility of the photoreaction [8,9], or (ii) an improvement of the photoswitching efficiency [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Two parameters seem to have a great importance to modify this coupling. The first one is the distance between the metallic nanoparticle and the photochromic unit [5,10]. The second parameter is the overlap between the SPR band and the electronic transition of the photochromic unit [13,14].…”

Section: Introductionmentioning

confidence: 99%

Importance of Gold Nanorods’ Aggregation in Surface Plasmon Coupling with a Photochromic Film in Hybrid Structures

2015

View full text Add to dashboard Cite

In this paper, hybrid samples composed of photochromic film deposited on glass substrates functionalized with gold nanorods were synthesized. Three samples of gold nanorods with different aspect ratios were produced and characterized by electron microscopy and extinction spectroscopy. The rod populations were chosen to have more or less overlap between the two surface plasmon resonance bands and the absorption band of the colored form of the photochromic compounds which is commercially available. Deposition of the nanoparticles on glass substrate exhibits a new surface plasmon resonance coupling band coming from their side-by-side organization. Spectroscopic studies of the photoisomerization process of photochromic film spin-coated on the gold nanorods show reversible interaction between photochromism and plasmonic properties. Despite such coupling has been previously reported emphasizing the main role of the bands overlapping, in this paper, we clearly show that the surface resonance coupling band is the key parameter to monitor the photochromic process. This result emphasizes the importance of coupling nanoparticles to increase their sensing potential and interaction with photochromic molecules.

show abstract

Enhanced One-Photon Cycloreversion Reaction of Diarylethenes near Individual Gold Nanoparticles

Cited by 39 publications

References 39 publications

Photoacoustic Imaging: Contrast Agents and Their Biomedical Applications

Photoacoustic Imaging: Contrast Agents and Their Biomedical Applications

Nanophotochromism

Importance of Gold Nanorods’ Aggregation in Surface Plasmon Coupling with a Photochromic Film in Hybrid Structures

Contact Info

Product

Resources

About