Silver nanocrystals by hyperbranched polyurethane-assisted photochemical reduction of Ag+

Lu, Huanjun; Liu, S.H.; Wang, X.L.; Qian, Xuefeng; Yin, Jian‐Hang; Zhu, Zi-kang

doi:10.1016/s0254-0584(03)00147-0

Cited by 130 publications

(44 citation statements)

References 17 publications

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“…This clearly shows that, the silver nanoparticles formed by the plants are crystalline in nature. The intense peaks observed in the spectrum are in agreement to the Braggs's reflection corresponding to the (111), (200), (220), (311), and (222) sets of lattice planes of silver nanocrystals (Lu et al, 2003;Bhainsa and D'Souza, 2006). Intense Bragg reflections suggest that strong X-ray scattering centres in the crystalline phase and could be due to capping agents.…”

Section: Discussionsupporting

confidence: 64%

In vitro synthesis of antimicrobial silver nanoparticles by mangroves, saltmarshes and plants of coastal origin

Kathiresan

Alikunhi

Nabikhan

2012

IJBNN

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A total of 13 leaf extracts of coastal plants were used for the synthesis of silver nanoparticles and to test the antimicrobial potential of nanoparticles. The highest amount of nanoparticles was obtained by Sesuvium portulacastrum followed by Prosopis chilensis, Hibiscus rosasinensis and Clerodendrum inerme. The synthesised nanoparticles were spherical with variable size ranging from 5 to 20 nm, as evident by transmission electron microscopy. The synthesis of silver nanoparticles was confirmed with X-ray diffraction spectrum. Fourier transform infrared spectroscopy identified the presence of amide I, II and III, aromatic rings, geminal methyls and ether linkages indicating the presence of biomolecules responsible for stabilisation of the silver nanoparticles. Protein bands with molecular weight in a range of 35 to 100 kDa were detected. The nanoparticles inhibited clinical strains of bacteria and fungi with more distinct antifungal activity, which was enhanced when polyvinyl alcohol was added as a stabilising agent.

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Section: Discussionsupporting

confidence: 64%

In vitro synthesis of antimicrobial silver nanoparticles by mangroves, saltmarshes and plants of coastal origin

Kathiresan

Alikunhi

Nabikhan

2012

IJBNN

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“…Photochemical reduction is an attractive means of accomplishing this end, as it allows for complete mixing of the reagents before the synthesis is initiated. Whereas a number of groups have reported photochemical syntheses of silver nanoparticles [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], in all of this previous work, the resultant nanoparticles have been polydisperse and often relatively large as well. The polydispersity of the particles produced is probably related to the fact that these syntheses involve ultraviolet exposure times of many minutes.…”

mentioning

confidence: 91%

Photochemical Synthesis and Multiphoton Luminescence of Monodisperse Silver Nanocrystals

et al. 2006

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A rapid, photochemical solution-phase synthesis has been developed for the production of monodisperse, nanometer-sized silver particles. The stabilizer used in the synthesis can be used to control the average diameter of the particles over a range from 1 to 7 nm. The same reaction mixture can also be employed to deposit patterns of nanoparticles with a laser via multiphoton absorption. The particles exhibit strong multiphoton absorption-induced luminescence when irradiated with 800-nm light, allowing emission from single nanoparticles to be observed readily.Keywords Silver nanoparticle . Photochemical synthesis . Multiphoton absorption . LuminescenceApplications of noble-metal nanoparticles have grown exponentially over the past decade. Silver is one of the least expensive of the noble metals and is only weakly reactive in the bulk. In nanoparticle form, silver has properties that can be exploited for applications such as surface-enhanced Raman spectroscopy (SERS) [1], even down to the single-molecule level [2,3]. In addition, subnanometer silver clusters show considerable promise as luminescent media for single-molecule studies [4,5]. Although the preparation of monodisperse nanoclusters of metals such as gold and platinum with average diameters that can be less than 1 nm is well documented [6,7], the synthesis of monodisperse silver nanoclusters is generally a considerably more difficult prospect, and it has been difficult to attain diameters of less than 3 nm in solution [8,9]. Here we report a facile solution-phase photochemical synthesis that, in a matter of minutes, produces monodisperse silver nanoclusters with controllable average diameters that can range from 1 to 7 nm. We further show that two-photon absorption (TPA) can be used to pattern the nanoparticles on a substrate. In addition, the particles exhibit strong multiphoton-absorption-induced luminescence (MAIL) upon irradiation with ultrafast pulses of 800-nm light, allowing the emission of individual particles to be monitored.The role of kinetics in determining the average size and dispersity of semiconductor nanoparticles has long been recognized and used to advantage [10]. Many such schemes require the rapid mixing of precursors to initiate the synthesis of nanoparticles. However, this type of strategy has received considerably less attention in the synthesis of noble-metal nanoparticles. A key element in such an approach is the ability to reduce silver cations quickly, such that nanoparticles with small diameters can be trapped kinetically. Photochemical reduction is an attractive means of accomplishing this end, as it allows for complete mixing of the reagents before the synthesis is initiated. Whereas a number of groups have reported photochemical syntheses of silver nanoparticles [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], in all of this previous work, the resultant nanoparticles have been polydisperse and often relatively large as well. The polydispersity of the particles produced is probably related to the fact that the...

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“…The antimicrobial properties of Ag hold significant promise; the development of bacterial resistance 1,3 , the mechanism of action 6,7 , toxicology 8,9 and clinical utility has been studied greatly for medical applications 10,11 . Nowadays, polymer modified with silver nanoparticles combinations were studied for a range of non-medical applications 12 , where their electrical conductivity 13 , light scattering and catalytic activity was demonstrated to be valuable 14,15 . The literature contains several works on synthesis of nano silver particle modified coating materials have been investigated 13,[16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, polymer modified with silver nanoparticles combinations were studied for a range of non-medical applications 12 , where their electrical conductivity 13 , light scattering and catalytic activity was demonstrated to be valuable 14,15 . The literature contains several works on synthesis of nano silver particle modified coating materials have been investigated 13,[16][17][18] . All synthesized materials result in generally well but materials usually complex, not straightforward and expensive than our method.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Antibacterial Polyurethane Acrylate-based Materials

Zeytuncu

Morcali

2015

Mat. Res.

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Silver nanocrystals by hyperbranched polyurethane-assisted photochemical reduction of Ag+

Cited by 130 publications

References 17 publications

In vitro synthesis of antimicrobial silver nanoparticles by mangroves, saltmarshes and plants of coastal origin

In vitro synthesis of antimicrobial silver nanoparticles by mangroves, saltmarshes and plants of coastal origin

Photochemical Synthesis and Multiphoton Luminescence of Monodisperse Silver Nanocrystals

Fabrication and Characterization of Antibacterial Polyurethane Acrylate-based Materials

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