Hydrazine-Induced Room-Temperature Transformation of CdTe Nanoparticles to Nanowires

Abstract

The effect of hydrazine on the photophysical and morphological properties of water-soluble thioglycolic acid-capped cadmium telluride (CdTe) nanoparticles at room temperature has been investigated. At lower concentrations of hydrazine (0.5 M), a large enhancement in the luminescence of CdTe nanoparticles was observed without any shape change; hydrazine saturates the Cd dangling bonds on the nanoparticles’ surface through coordination. Interestingly, highly crystalline CdTe nanowires with hexagonal wurtzite structure were obtained at higher concentrations of hydrazine (2.0 M) through the recrystallization of linearly assembled aggregated CdTe nanoparticles with a zinc blend structure. Strong dipole−dipole interaction between the nanoparticles in the presence of hydrazine assists their linear aggregation, and low activation energy for phase-transition drives their recrystallization to nanowires. Extremely simple methodology presented here opens up novel pathways for the synthesis of one-dimensional semiconductor nanostructures at room temperature and provides valuable information about the growth mechanism of nanowires.

Fast Doping of Cu into ZnSe NCs by Hydrazine Promoted Cation Exchange in Aqueous Solution at Room Temperature

“…In the above reactions, the coordinative interaction between N 2 H 4 and cations (Zn 2+ and Cu + ) may greatly increase the diffusion speed of cations thus creates the driving force to convert the ZnSe NCs into Cu 1.8 Se. In fact, previous reports had revealed that N 2 H 4 could promote the growth or transformation of NCs in aqueous solution by binding to the metal ions [38][39][40]. In addition, an extremely excessive amount of N 2 H 4 in aqueous solution can also serve as an alkaline buffer to neutralize the acidic Cu or Zn stock solution.…”

A facile method for gold decoration of Te@CdTe nanorods in aqueous solution

“…According to the reference method with minor modification [47], CdTe NRs were formed by adding 2 M N 2 H 4 to purified CdTe NCs solution. The concentration of the purified CdTe NCs is 0.5 Â 10 À3 mol/L.…”

“…The Te@CdTe NRs were prepared according to the reference method with minor modifications [47]. Briefly, purified CdTe NCs were dispersed into 2 M N 2 H 4 solution.…”

“…Aqueous synthesis of nanoparticles is inexpensive, nontoxic, and easy to upscale. In fact, there have been many reports on the synthesis of semiconductor NRs and nanowires (NWs) in aqueous solution [44][45][46][47]. However, there are few reports on direct synthesis of metal-semiconductor hybrid nanoparticles in aqueous media using these NRs and NWs as templates.…”

Sodium‐Naphthalenide‐Driven Synthesis of Base‐Metal Nanoparticles and Follow‐up Reactions

“…Separation of the post-synthesis oleylamine-stabilized metal nanoparticles is possible by hydrazine treatment (Figures S4,S5). [12] It is to be noted that oleylamine is absent during particle nucleation and only needed for long-term stabilization. Except for Ru 0 , all the small-sized, base metals are highly reactive and need to be handled under inert conditions (N 2 ,Ar, vacuum).…”