Preparation and Characterization of Porphyrin Nanoparticles

Gong, Xianchang; Milic, Tatjana; Xu, Chang; Batteas, James D.; Drain, Charles Michael

doi:10.1021/ja027405z

Cited by 280 publications

(240 citation statements)

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“…6 Taking the diversity and physiological activity of organic molecules into consideration, scientific and technological interest in organic nanoparticle has been clearly increasing. [7][8][9] To fabricate organic nanoparticles, a few methods have been applied so far, such as laser ablation, 10 sol-gel method, 11 and the reprecipitation method. 12 In particular, since the first report by Nakanishi and co-workers on the synthesis of organic nanoparticles by using the reprecipitation method, this technique has been widely employed to prepare organic nanoparticles of a wide variety of compounds.…”

mentioning

confidence: 99%

Organic Nanoparticles of Cyanine Dye in Aqueous Solution

Ou¹,

Yao²,

Kimura³

2007

Bulletin of the Chemical Society of Japan

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Ion-based organic dye nanoparticles ranging from tens to hundreds of nanometers have been prepared in aqueous solution. The synthetic approach is based on ''ion-association'' (hydrophobic ion-pair formation) in water between the dye cation pseudoisocyanine (PIC) and the anion tetraphenylborate (TPB) or tetrakis(4-fluorophenyl)borate (TFPB) ion. Size tuning of spherical and amorphous PIC nanoparticles was accomplished by varying the molar ratio () of the loaded anion to the dye cation. Electrophoretic characterization revealed that the increase in surface adsorption of anions onto PIC particles brings about an increase in the negative surface charge density, causing a reduction in the surface tension and the mean size of nanoparticles. We found that the optical absorption properties of the PIC nanoparticles exhibited (i) matrix dependence, that is, the 0-0 band position of the PIC chromophore within similar-sized nanoparticles was dependent on the type of counter anions used, and (ii) size dependence, i.e., the 0-0 band position of the PIC chromophore was dependent on the mean nanoparticle diameter when the particles were prepared using the same counter anion.For more than a decade, inorganic nanoparticles, such as semiconductor and metal nanoparticles, have attracted a great deal of attention from experimentalists and theoreticians and have been studied extensively. This is due to the fact that such nanoparticles are intermediate in size between single molecules and bulk materials and have interesting physical/chemical properties that are size dependent.1-5 Organic nanoparticles consisting of small molecules, on the other hand, have not been as well investigated as inorganic nanoparticles probably because of the lack of well-defined synthetic approaches. In organic nanoparticles, weak van der Waals intermolecular and hydrogen-bonding interactions are responsible for the specific electronic/optical properties that are fundamentally different from those of inorganic metals or semiconductors. 6 Taking the diversity and physiological activity of organic molecules into consideration, scientific and technological interest in organic nanoparticle has been clearly increasing. 7-9To fabricate organic nanoparticles, a few methods have been applied so far, such as laser ablation, 10 sol-gel method, 11 and the reprecipitation method. 12 In particular, since the first report by Nakanishi and co-workers on the synthesis of organic nanoparticles by using the reprecipitation method, this technique has been widely employed to prepare organic nanoparticles of a wide variety of compounds.12-18 The reprecipitation method is based on the adjustment of inherent solubility of organic materials by adding electrolytes or organic co-solvents. Despite the simplicity in its operation, it is fraught with difficulties. For instance, organic solvents or surfactants are often used to control the particle size, and the obtained size distributions are relatively broad, which is in stark contrast to those for the well-controlled semiconductor or ...

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mentioning

confidence: 99%

Organic Nanoparticles of Cyanine Dye in Aqueous Solution

Ou¹,

Yao²,

Kimura³

2007

Bulletin of the Chemical Society of Japan

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“…Polyphenyl derivatives (13), 17,18 fused aromatic rings (48), 19,20 porphyrin derivatives (9,10), 21,22 metal phthalocyanines (11), 23 fullerenes (12), 24 and some fluorescent dyes (13,14) have been made into nanoparticles. 25,26 Their molecular structures are illustrated in Figure 1.…”

Section: Small Molecule Semiconductorsmentioning

confidence: 99%

“…Poly(phenylene vinylene)s (15), 27 polyfluorenes (1618), 28  30 polythiophenes (19), 31 laddertype poly(para-phenylene)s (LPPP) (20), 32 poly(phenylene ethynylene)s (PPEs) (21,22), 33 polyanilines (PANIs) (23), 34 and some copolymers (24,25) have been utilized to prepare nanoparticles. 35,36 Their molecular structures are shown in Figure 2.…”

Section: Polymer Semiconductorsmentioning

confidence: 99%

Organic Semiconductor Nanoparticle Film: Preparation and Application

Xu¹,

Li²

2012

Smart Nanoparticles Technology

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“…Moreover, nanometer size small molecules have become the focus of surface science studies [4]. Recently porphyrins have more interest to be examined after known that size of the molecules in nanometer orde [5][6][7][8]. Porphyrin supramolecular structures can be formed on metal substrate surfaces as a result of metal-porphyrin and porphyrin-porphyrin interactions [9].…”

Section: Introductionmentioning

confidence: 99%