Sandwich-structured Fe2O3@SiO2@Au nanoparticles with magnetoplasmonic responses

Cai, Zhongyu; Leong, Eng Choon; Wang, Zhigang; Niu, Wenxin; Zhang, Weiqing; Ravaine, Serge; Yakovlev, N.L.; Liu, Yan Jun; Teng, Jinghua; Lu, Xianmao

doi:10.1039/c5tc01259g

Cited by 16 publications

(8 citation statements)

References 44 publications

(66 reference statements)

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“…The final iron loading was measured by ICP-AES analysis and it was fixed to 2.6 wt.%. The XRD spectrum of the iron catalyst ( Figure S1) was in accord with related literature reports [50].…”

Section: General Procedures For the Preparation Of N-c 2 /Sic And N-c supporting

confidence: 87%

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

et al. 2021

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Carbon-based nanomaterials, particularly in the form of N-doped networks, are receiving the attention of the catalysis community as effective metal-free systems for a relatively wide range of industrially relevant transformations. Among them, they have drawn attention as highly valuable and durable catalysts for the selective hydrogen sulfide oxidation to elemental sulfur in the treatment of natural gas. In this contribution, we report the outstanding performance of N-C/SiC based composites obtained by the surface coating of a non-oxide ceramic with a mesoporous N-doped carbon phase, starting from commercially available and cheap food-grade components. Our study points out on the importance of controlling the chemical and morphological properties of the N-C phase to get more effective and robust catalysts suitable to operate H2S removal from sour (acid) gases under severe desulfurization conditions (high GHSVs and concentrations of aromatics as sour gas stream contaminants). We firstly discuss the optimization of the SiC impregnation/thermal treatment sequences for the N-C phase growth as well as on the role of aromatic contaminants in concentrations as high as 4 vol.% on the catalyst performance and its stability on run. A long-term desulfurization process (up to 720 h), in the presence of intermittent toluene rates (as aromatic contaminant) and variable operative temperatures, has been used to validate the excellent performance of our optimized N-C2/SiC catalyst as well as to rationalize its unique stability and coke-resistance on run.

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Section: General Procedures For the Preparation Of N-c 2 /Sic And N-c supporting

confidence: 87%

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

et al. 2021

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“…These templates are multipod clusters made of a core silica sphere surrounded by a controlled number of PS latex spherical satellites. Inspired by the pioneering works of Halas and coworkers [57][58][59][60] alongside more recent publications, [61][62][63][64] we took advantage of the regioselective attachment of gold nanoseeds onto the accessible surface of the silica cores of binary clusters and their subsequent growth. Because of the lack of affinity between gold and the surface of the PS satellites, gold was selectively reduced onto the seeds, creating the cage structure in the interstitial gaps between PS satellites.…”

Section: Introductionmentioning

confidence: 99%

Versatile template-directed synthesis of gold nanocages with a predefined number of windows

et al. 2021

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“…The precipitation of paramagnetic hematite nanorods from ferric chloride solutions is a case in point, two contrasting structure-directing additives, phosphate ions [5] and 1,2-diaminopropane [6], lead to hematite "nanorods" as the final product but since the 1,2-diaminopropane-directed rods achieve higher crystallinities and larger aspect ratios, it is possible the two processes involve different mechanisms. There has been considerable discussion of the mechanisms involved [7][8][9][10], but the picture is complicated by the range of conditions under which nanorod synthesis is performed, phosphate-directed nanorods have been synthesized at temperatures ranging from~100°C [11] to 210°C [10] for example whilst the FeCl 3 :PO 4 − ratio ranges from 6:1 to 40:1.…”

Section: Introductionmentioning

confidence: 99%

The Role of Growth Directors in Controlling the Morphology of Hematite Nanorods

et al. 2020

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The control of the growth of hematite nanoparticles from iron chloride solutions under hydrothermal conditions in the presence of two different structure promoters has been studied using a range of both structural and spectroscopic techniques including the first report of photo induced force microscopy (PiFM) to map the topographic distribution of the structure-directing agents on the developing nanoparticles. We show that the shape of the nanoparticles can be controlled using the concentration of phosphate ions up to a limit determined to be~6 × 10 −3 mol. Akaganéite (β-FeOOH) is a major component of the nanoparticles formed in the absence of structure directors but only present in the very early stages (< 8 h) of particle growth when phosphate is present. The PiFM data suggest a correlation between the areas in which phosphate ions are adsorbed and areas where akaganéite persists on the surface. In contrast, goethite (α-FeOOH) is a directly observed precursor of the hematite nanorods when 1,2-diamino propane is present. The PiFM data shows goethite in the center of the developing particles consistent with a mechanism in which the iron hydroxide redissolves and precipitates at the nanorod ends as hematite.

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Sandwich-structured Fe₂O₃@SiO₂@Au nanoparticles with magnetoplasmonic responses

Abstract: We fabricated highly uniform sandwich-structured γ-Fe2O3@SiO2@Au spindle nanoparticles with novel structural and magnetic tunable surface plasmon resonance.

Cited by 16 publications

References 44 publications

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

Versatile template-directed synthesis of gold nanocages with a predefined number of windows

The Role of Growth Directors in Controlling the Morphology of Hematite Nanorods

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