A facile one-pot synthesis of blue and red luminescent thiol stabilized gold nanoclusters: a thorough optical and microscopy study

Abstract

Here in this contribution, blue and red luminescent 1-dodecanethiol (DT) terminated gold nanoclusters (AuNC) were prepared by a simple two-step synthesis route where the first step involved the surfactantfree synthesis of bare AuNC in N,N 0 -dimethylformamide (DMF) and the second step is the termination of the as-prepared bare AuNC by 1-dodecanethiol. The blue and red luminescent DT-terminated AuNC were isolated by a solvent-induced precipitation followed by an ultra-centrifugation technique. Both the bare AuNC and the blue and red luminescent DT-terminated AuNC exhibit stable photoluminescence and good solubility in various solvents. The photo-physical, electronic, structural, and morphological properties of the bare AuNC and the blue and red luminescent DT-terminated AuNC were examined by performing UV-Vis absorption spectroscopy, stationary and time-resolved PL spectroscopy, X-ray photoelectron spectroscopy (XPS), femtosecond transient absorption spectroscopy, Fourier-transform infrared spectroscopy (FTIR-ATR), and high-resolution transmission electron microscopy (HRTEM) experiments.

Versatile one-pot synthesis of gold nanoclusters and nanoparticles using 3,6-(dipyridin-2-yl)-(1,2,4,5)-tetrazine

“…Two kinds of processes have emerged, a bottom-up starting from gold salts or gold complexes and a top-down consisting in etching nanoparticles by addition of an excess of ligands or by phase transfer. 12 Most of these syntheses rely on the use of mild reductants like citrate, ascorbate, 13 hydrazine hydrate, 14 borohydride 15,16 among others, added to the solution of gold salt with a surfactant (alkanethiols, [17][18][19] phosphines, 20 BSA, 21 DNA, 22 .) to stabilize the nano-objects formed.…”

Controlling the Growth of LiBH4 Nanoparticles for Hydrogen Storage

“…When comparing with the spectra of LiBH 4 stabilized with thiol‐based surfactants, the disappearance of the R—SH stretching modes observed within the pristine surfactants, i.e., at 2563 cm −1 for HXT, 2566 cm −1 for DDT, and 2558 cm −1 for ODT (Figure S4, Supporting Information) indicate the dehydrogenation of —SH in favor of the attachment of the ligand to the LiBH 4 surface, as shown in reaction …”

Tuning Optical and Granulometric Properties of Gold Nanostructures Synthesized with the Aid of Different Types of Honeys for Microwave-Induced Hyperthermia

“…Localized surface resonance of plasmonic AuNPs was responsible for their optical properties in visible light [57]. For colloidal suspension of AuNPs, the absorption band of their localized surface plasmon resonance (LSPR) is situated in the range from 520 to 550 nm [58]. Furthermore, as the size of AuNPs increases, the position of the LSPR absorption band shifts towards longer wavelengths, absorbing red light and reflecting blue light, as described by the Mie’s scattering theory [59].…”