High-Density Chemical Intercalation of Zero-Valent Copper into Bi₂Se₃ Nanoribbons

Abstract

A major goal of intercalation chemistry is to intercalate high densities of guest species without disrupting the host lattice. Many intercalant concentrations, however, are limited by the charge of the guest species. Here we have developed a general solution-based chemical method for intercalating extraordinarily high densities of zero-valent copper metal into layered Bi(2)Se(3) nanoribbons. Up to 60 atom % copper (Cu(7.5)Bi(2)Se(3)) can be intercalated with no disruption to the host lattice using a solution disproportionation redox reaction.

Synthesis of Ti3AuC2, Ti3Au2C2 and Ti3IrC2 by noble metal substitution reaction in Ti3SiC2 for high-temperature-stable Ohmic contacts to SiC

“…This facilitates identifying the oxidation states of the noble metals. 14,15 As can be seen, no distinctive shift can be observed between the EELS spectrum of the noble metals in the Ti3AuC2, Ti3Au2C2, and Ti3IrC2 phases when compared to those of their pure elemental state. In addition, the near-edge fine structure of the peaks are rather identical.…”

Paramagnetic Cu-doped Bi2Te3 nanoplates

“…It should be noted that EELS is a powerful technique for identifying the oxidation states of a transition metal from its near-edge fine structure, such as the L 3 /L 2 edges. [41][42][43] Through carefully analyzing the obtained EELS profiles (particular from a Cu particle and from a CuTe nanoplate), the Cu fine structure in non-zero oxidation states, such as Cu 2þ , shows distinct, intense, and sharp L 3 /L 2 edges. 41,42 As can be seen from To understand the doping state of Cu and their bonding behavior in the Cu-doped Bi 2 Te 3 nanoplates, XPS was performed and an example is shown in Fig.…”

“…[41][42][43] Through carefully analyzing the obtained EELS profiles (particular from a Cu particle and from a CuTe nanoplate), the Cu fine structure in non-zero oxidation states, such as Cu 2þ , shows distinct, intense, and sharp L 3 /L 2 edges. 41,42 As can be seen from To understand the doping state of Cu and their bonding behavior in the Cu-doped Bi 2 Te 3 nanoplates, XPS was performed and an example is shown in Fig. 3(a), in which the predominant measured binding energies for Bi and Te are 157.8 eV for Bi 4f and 573.7 eV for Te 3d, respectively; which correspond to the Bi 2 Te 3 phase.…”

Tunable Plasmon and Optical Properties of Chalcogenide Nanoplates Using Monochromated Electron Energy Loss Spectroscopy

“…For example, Bi2Se3 and Bi2Te3 are recently discovered topological insulators [1] while MoS 2 is a promising catalyst for hydrogen evolution reaction (HER) [2,3]. The layered crystal structure provides a unique opportunity to tune the materials properties by intercalation, a chemical process to insert guest species at the van der Waals gap [4,5] (Figure 1A, schematic).Dielectric properties of these metal chalcogenides are such that both dielectric photonic and surface plasmonic modes can be supported in ultrathin chalcogenide nanoplates. Using intercalation, we demonstrate that the optical and plasmonic properties of chalcogenide nanoplates can be tuned [6].…”

“…For example, Bi2Se3 and Bi2Te3 are recently discovered topological insulators [1] while MoS 2 is a promising catalyst for hydrogen evolution reaction (HER) [2,3]. The layered crystal structure provides a unique opportunity to tune the materials properties by intercalation, a chemical process to insert guest species at the van der Waals gap [4,5] (Figure 1A, schematic).…”