Grafting of gold onto spin-crossover nanoparticles: SCO@Au

Moulet, Lucie; Daro, Nathalie; Mornet, Stéphane; Vilar-Vidal, Noelia; Chastanet, Guillaume; Guionneau, Philippe

doi:10.1039/c6cc05708j

Cited by 19 publications

(19 citation statements)

References 34 publications

(3 reference statements)

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“…In this study, we hypothesize that the amphiphilic Htrz ligands partially exchange the outer layer of CTAB around the AuNRs, [ 11 ] enabling the colloidal stability during the SCO growth. Therefore, different concentrations and volumes of Htrz solutions are tested.…”

Section: Resultsmentioning

confidence: 99%

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The Interplay between Surface Plasmon Resonance and Switching Properties in Gold@Spin Crossover Nanocomposites

Palluel

Tran

Daro

et al. 2020

Adv Funct Materials

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Rod-like gold nanoparticles are directly embedded in a 1D-polymeric spin crossover (SCO) material leading to singular Au@SCO nanohybrid architectures. The resulting architectures are designed to promote a synergetic effect between ultrafast spin-state photoswitching and photothermal properties of plasmonic nanoparticles. This synergy is evidenced by the strong modulation of the surface plasmon resonance of the gold nanorods through the spin-state switching of the SCO component and also the strong enhancement of the photoswitching efficiency compared to pure SCO particles. This remarkable synergy results from the large modulation of the dielectric properties of the SCO polymer upon its thermal switching and the enhancement of the heating of these hybrid nanostructures upon excitation of the surface plasmon resonance of the gold nanorods.

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Section: Resultsmentioning

confidence: 99%

“…Following this approach, a well‐controlled amount of gold nanospheres of various sizes were grafted on [Fe(Htrz) 2 (trz)](BF 4 ) (Htrz = 1 H ‐1,2,4‐triazole and trz = deprotonated triazolato(−) ligand) nanoparticles. [ 11 ]…”

Section: Introductionmentioning

confidence: 99%

The Interplay between Surface Plasmon Resonance and Switching Properties in Gold@Spin Crossover Nanocomposites

Palluel

Tran

Daro

et al. 2020

Adv Funct Materials

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“…The compound [Fe(Htrz) 2 (trz)](BF 4 ) (Htrz = 1H-1,2,4-triazole and trz = deprotonated triazolato ligand) is probably the most studied of the SCO coordination polymers for its chemical stability, the very abrupt and large SCO hysteresis loop between 345 K and 385 K, together with clear evidence that it is possible to get rod-shaped particles with a large panel of sizes, from the nano- to the micro-range, in a controlled way [4,5,6,7,8,15,16,17,19,27,28,29,30,31,32,45,46]. Some indications of fatigability have been recently shown after a large number of SCO cycles were applied to the nanorods [7,47].…”

Section: Resultsmentioning

confidence: 99%

“…The functionalization of these kinds of SCO NPs is presently underway and, for example, hybrid particles represent a possible path to overcome the fragility of these NPs or to enhance their switching features. In this context, for example, functionalized [Fe(R-trz) 3 ] particles of SCO@SiO 2 @Au [28,29] and SCO@Au [30] have been recently synthesized based on micelle techniques or by integration in mesoporous silica for SCO@MCM [31]. Since these approaches always result in nanorods showing the bulk-material SCO properties, a new approach has to be used to get to new morphologies of SCO particles.…”

Section: Introductionmentioning

confidence: 99%

Spray-Drying to Get Spin-Crossover Materials

et al. 2017

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Spin-crossover (SCO) triazole-based coordination polymers can be synthesized by micelle techniques, which almost always lead to rod-shaped nanoparticles. In order to notably reach new morphologies, we explore here the potentiality of the spray-drying (SD) method to get SCO materials. Three SCO coordination polymers and a mononuclear complex are investigated. In all cases, the SD method obtains particles definitely showing SCO. The features of the latter are yet always different from those of the referenced materials, in the sense that SCO is more gradual and incomplete, in adequacy with the poor crystallinity of the powders obtained by SD. In the case of coordination polymers, the particles are preferentially spherical. Indications of possible polymorphism and/or new materials induced by the use of the SD method are evidenced. In the case of the mononuclear complex, the SD method has allowed reproducing, in a quick and easy way, the well-known bulk compound. This exploratory work demonstrates the relevance of the concept and opens the way to a systematic scrutiny of all the experimental parameters to tune the size, morphology, and properties of the SD-synthesized SCO particles.

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“…For instance, luminescence or plasmonic properties can be incorporated in these SCO NPs by functionalizing the SiO2 shell with luminescent molecules or gold (Au) NPs, respectively. [28][29][30] Despite these attractive features, the presence of a thick SiO2 shell has a negative effect on the performance of an electronic device based on these switching NPs. In particular, this insulating shell seriously limits the conductivity through the NPs, making difficult the detection of the spin transition since the switching occurs at very low conductivity levels.…”

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Size-Dependent Spin Switching in Robust Fe-triazole@SiO2 Spin-Crossover Nanoparticles with Ultrathin Shell

Torres‐Cavanillas¹,

Moya²,

Tichelaar³

et al. 2019

Preprint

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A familly of chemically robust hybrid [Fe(Htrz)2(trz)](BF4)@SiO2 nanoparticles (NPs) presenting different sizes (from ca. 90 to 28 nm) and a ultrathin silica shell (< 3 nm) have been prepared. All NPs present a characteristic abrupt spin transition with a subsequent decrease in the width of the thermal hysteresis upon reducing the NP size.Spin-crossover (SCO) compounds represent a current focus of interest in Molecular Magnetism owing to their ability to undergo low-spin (LS) to high-spin (HS) transitions under the influence of external stimuli such as temperature, pressure, light or electric field. 1,2,3 In contrast to the vast majority of magnetic molecular materials, these smart materials often exhibit the spin transition near room temperature. Such a feature makes them appealing for the design of switchable devices for information processing. 4 In this context, the 1D triazole-based Fe II coordination polymers of general formula [Fe(Rtrz)3]X2 5 (Rtrz = 4-R-1,2,4-triazole and X = monovalent anion) are generally considered the most promising SCO materials, since they exhibit a large thermal hysteresis near room temperature. 6

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Grafting of gold onto spin-crossover nanoparticles: SCO@Au

Cited by 19 publications

References 34 publications

The Interplay between Surface Plasmon Resonance and Switching Properties in Gold@Spin Crossover Nanocomposites

The Interplay between Surface Plasmon Resonance and Switching Properties in Gold@Spin Crossover Nanocomposites

Spray-Drying to Get Spin-Crossover Materials

Size-Dependent Spin Switching in Robust Fe-triazole@SiO2 Spin-Crossover Nanoparticles with Ultrathin Shell

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