Formation of gold nanoparticles in polymeric nanowires by low-temperature thermolysis of gold mesitylene

Erk, Christoph; Yau, Man Yan Eric; Lange, Holger; Thomsen, C.; Miclea, P.-T.; Wehrspohn, Ralf B.; Schlecht, Sabine; Steinhart, Martin

doi:10.1039/c1jm14193g

Cited by 5 publications

(3 citation statements)

References 37 publications

(35 reference statements)

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“…Therefore, improving the photostability of UV screening materials is still a challenge. Literatures and our experiments have shown that the un‐assembled Au(I)‐thiolates are easy to transform to gold clusters or gold nanoparticles by chemical reduction, [37–40] thermolysis [41] or photolysis [42] . Here, we studied whether the assembled Au(I)‐thiolate nanosheets can have comparable or superior photostability to the commercial organic UV absorbents.…”

Section: Resultsmentioning

confidence: 99%

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

Zhang

Yang

et al. 2021

ChemNanoMat

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UV screening is very important for the prevention of skin cancer and the elongation of the lifetime of organic/polymeric stuff. To overcome the main problems of poor hydrophilicity and easy leakage of organic UV absorbents, water‐dispersible Au(I)‐thiolate nanosheets have been studied as a new type of UV absorbents. The results show that Au(I)‐thiolate nanosheets have i) very high molar absorption coefficients (>15000 mol/L.cm), ii) comparable or superior photostability to typical organic UV absorbents, and iii) high transparency and nearly no leakage in polymer matrix. So far, no other UV absorbents have been reported to have all the above good performances simultaneously. The transparent and colorless Au(I)‐thiolate/polymer thin films can effectively block UV light, and such a material will surely extend the types and the application scenarios of UV absorbents.

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Section: Resultsmentioning

confidence: 99%

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

Zhang

Yang

et al. 2021

ChemNanoMat

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“…For this purpose, it is necessary to synthesize nanoparticles as monodisperse as possible. To this end, thermolitic methods consist of the application of a thermal stimulus on the coated nanoparticles with the aim of producing nucleation processes that lead to the controlled growth of the metallic core [44][45][46]. In general, the procedure involves the thermal treatment of the nanoparticles at a given temperature for a period of time.…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoparticles Modification with Liquid Crystalline Polybenzylic Dendrons via 1,3-Dipolar Cycloaddition

2022

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A series of six polybenzylic dendrons with an alkynyl focal point were synthesized for their incorporation to gold nanoparticles. Five of these compounds showed columnar mesomorphism in a wide range of temperatures. These dendrons were reacted with gold nanoparticles stabilized with a combination of a dodecanethiol and 11-azidoundecane-1-thiol. The azido group of the last compound allowed the functionalization of the nanoparticles with the six polybenzylic dendrons by 1,3-dipolar cycloaddition between their alkynyl groups and the terminal azido groups of the thiols. A high efficiency of the cycloaddition process (47–69%) was confirmed by several experimental techniques and no decomposition or aggregation phenomena were detected in the dendron-coated nanoparticles. The involved mechanism and the resulting percentage composition of the final materials are discussed. The results of the ulterior growth of the nanoparticles by thermal treatment are influenced by the size and the shape of the dendron and the temperature of the process. The structures of the final nanoparticles were investigated by TEM, DSC, TGA, NMR and UV-Vis spectroscopy. These nanoparticles do not show liquid crystal properties. However, a melting process between a crystalline and a fluid phase is observed. In the solid phase, the nanomaterials prepared show a short-range interaction between nanoparticles with a 2D local hexagonal order. A near-field effect was observed in the UV-vis spectra by coupling of different surface plasmon resonance bands (SPR) probably due to the short-range interactions. The main novelty of this work lies in the scarcity of previous studies of gold nanoparticles coated with dendrons forming themselves columnar mesophases. Most of the studies reported in the literature deal with gold nanoparticles coated with calamitic mesogens. Additionally, the effect of the thermal treatment, which in a previous paper was shown to increase the mean size of the nanoparticles without increasing their size polydispersity, has been studied in these materials.

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“…Thereby, the extremely high temperatures of the heat treatment or the presence of the metal salt in the hot solution can lead to the aggregation or decomposition of the metallic core and the organic ligands, thus losing the homogeneity of the hybrid system. As a result, a more environmentally friendly approach to synthesis and control of metallic NPs becomes necessary. − …”

Section: Introductionmentioning

confidence: 99%

Controlled Growth of Dendrimer-Coated Gold Nanoparticles: A Solvent-Free Process in Mild Conditions

2020

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Monodisperse dendrimer-coated gold nanoparticles with a spherical shape have been obtained by direct reduction of HAuCl 4 with sodium borohydride in the presence of dodecanethiol as a stabilizer and subsequent functionalization by ligand exchange reaction with polybenzylic thiolated dendrons. The substitution pattern of the dendrimeric units plays a fundamental role in the rate of the functionalization exchange process and consequently conditions the size and the polydispersity of the NPs obtained. An ulterior growth process occurs by thermal stimuli (150 °C) in a solvent-free environment. This method, carried out in mild conditions, allows the formation of highly monodisperse gold NPs with different sizes for different time reactions, and we discuss the mechanisms involved in this process. Finally, we demonstrate the chemical composition and stability of our compounds by structural, thermal, and chemical characterization of the samples before and after thermal treatment.

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Formation of gold nanoparticles in polymeric nanowires by low-temperature thermolysis of gold mesitylene

Cited by 5 publications

References 37 publications

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

Gold Nanoparticles Modification with Liquid Crystalline Polybenzylic Dendrons via 1,3-Dipolar Cycloaddition

Controlled Growth of Dendrimer-Coated Gold Nanoparticles: A Solvent-Free Process in Mild Conditions

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