Manifestation of the Difference in Reactivity of Silver Clusters in Contrast to Its Ions and Nanoparticles: The Growth of Metal Tipped Te Nanowires

Som, Anirban; Samal, Akshaya K.; Udayabhaskararao, Thumu; Bootharaju, Megalamane S.; Pradeep, Thalappil

doi:10.1021/cm403288w

Cited by 25 publications

(34 citation statements)

References 57 publications

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“…[7][8][9][10][11][12][13][14][15][16] In particular, these hybrid nanostructures allow for the coupling of quantum confinement effects for excitons in the semiconducting portion 17 and shape-dependent localized plasmon excitation in the metallic portion, 18 which leads to the optimization of plasmon enhanced emission or absorption for applications in electronic and solar devices, 19,20 as well as in photocatalysis. 21 Over the past decade, considerable progress has been made in the synthesis of noble metal-semiconductor heterodimer nanostructures, including Au-CdSe, 7,15,22 Ag-ZnO, 23 Pt-CdS, 24,25 Au-Ag 2 S, 26 Ag-Cu 2 O 27 and Ag-Ag 2 S. [1][2][3] Although the majority of such heterodimers are synthesized by growing a shell of the noble metal onto the semiconductor components, in the case of silver nanoparticles, it is possible to chemically convert portions of anisotropic silver nanostructures to the corresponding semiconductor material (Ag 2 S, Ag 2 Se, Ag 2 Te), 28,29 thus allowing for the synthesis of hybrid structures beyond the conventional uniform core-shell motif.…”

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confidence: 99%

Ag–Ag₂S Hybrid Nanoprisms: Structural versus Plasmonic Evolution

et al. 2016

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Recently, Ag-Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag-Ag2S nanostructures can be synthesized via sulfidation of as-prepared anisotropic Ag nanoparticles, this process is poorly understood, often leading to materials with anomalous compositions, sizes, and shapes and, consequently, optical properties. In this work, we use theory and experiment to investigate the structural and plasmonic evolution of Ag-Ag2S nanoprisms during the sulfidation of Ag precursors. The previously observed red-shifted extinction of the Ag-Ag2S hybrid nanoprism as sulfidation occurs contradicts theoretical predictions, indicating that the reaction does not just occur at the prism tips as previously speculated. Our experiments show that sulfidation can induce either blue or red shifts in the extinction of the dipole plasmon mode, depending on reaction conditions. By elucidating the correlation with the final structure and morphology of the synthesized Ag-Ag2S nanoprisms, we find that, depending on the reaction conditions, sulfidation occurs on the prism tips and/or the (111) surfaces, leading to a core(Ag)-anisotropic shell(Ag2S) prism nanostructure. Additionally, we demonstrate that the direction of the shift in the dipole plasmon is a function of the relative amounts of Ag2S at the prism tips and Ag2S shell thickness around the prism.

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confidence: 99%

Ag–Ag₂S Hybrid Nanoprisms: Structural versus Plasmonic Evolution

et al. 2016

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“…At this point, it is important to clarify that the nodules seen on the NWs are due to electron beam irradiation of QCs and not due to their solution phase aggregation on the Te NW surface, as proven in a previous study from our group. [ 45 ] This was substantiated further by following the time evolution (over a period of 2 min) of the nodules on NWs ( Figure S2, Supporting Information), which demonstrated the systematic growth of silver particles upon electron beam exposure. The TEM data discussed so far is for [C 3 ] as at this cluster concentration, nodule formation and their evolution were observed most prominently.…”

Section: Communicationmentioning

confidence: 70%

Cluster‐Mediated Crossed Bilayer Precision Assemblies of 1D Nanowires

et al. 2016

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Highly organized crossed bilayer assemblies of nanowires (NWs) are made using directed hydrogen bonding between the protecting ligand shells of atomically precise cluster molecules anchored on NWs. Layers of quantum clusters remain sandwiched between two neighboring NWs at a defined distance, dictated by the core-size of the cluster, while the orientation of the ligands in space dictates the interlayer geometry.

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“…1a), the peaks are attributed to the cubic phases of Ag 2 O (JCPDS 43-0997) [13,14]. Additional three slight diffraction peaks can be indexed to the crystal planes of Ag 0 (JCPDS 04-0783) [15]. For Ag 2 O nanoparticles (red line in Fig.…”

Section: Resultsmentioning

confidence: 95%