Controlled Synthesis of Cu and Cu2O NPs and Incorporation of Octahedral Cu2O NPs in Cellulose II Films

Abstract

In this study, Cu and Cu2O nanoparticles (NPs) were synthesized through chemical reduction of soluble copper-chelating ligand complexes using formaldehyde as a reducing agent. The influence of various chelating ligands, such as ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and a surface-active derivative of DTPA (C12-DTPA), as well as surfactants (i.e., hexadecyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium chloride (DoTAC), sodium dodecyl sulfate (SDS), and dimethyldodecylamine-N-oxide (DDAO)), on morphology and the composition of produced NPs was investigated. In the absence of surfactants, spherical copper particles with polycrystalline structure could be obtained. X-ray diffraction (XRD) analysis revealed that, in the presence of EDTA, the synthesized NPs are mainly composed of Cu with a crystallite size on the order of 35 nm, while with DTPA and C12-DTPA, Cu2O is also present in the NPs as a minority phase. The addition of ionic surfactants to the copper–EDTA complex solution before reduction resulted in smaller spherical particles, mainly composed of Cu. However, when DDAO was added, pure Cu2O nano-octahedrons were formed, as verified by high-resolution scanning electron microscopy (HR-SEM) and XRD. Furthermore, a hybrid material could be successfully prepared by mixing the octahedral Cu2O NPs with cellulose dissolved in a LiOH/urea solvent system, followed by spin-coating on silica wafers. It is expected that this simple and scalable route to prepare hybrid materials could be applied to a variety of possible applications.

On 3D printed biomedical sensors for non-enzymatic glucose sensing applications

“…As per the reported literature scalable route to prepare hybrid materials could be applied for enhancing the sensitivity of sensors for various applications. 30 One of the low-cost solutions to prepare smart 3D printed sensors for bio-medical applications lies in the fabrication of programmable feedstock filaments. Some studies have been reported on the use of smart sensors for non-enzymatic glucose sensing applications.…”

Effect of copper ions concentration on the particle size of alginate-stabilized Cu2O-Cu nanocolloids and its antibacterial activity against rice bacterial leaf blight (Xanthomonas oryzae pv. oryzae)

“…Among various practical approaches to preparing Cu 2 O-Cu nanoparticles, the chemical reduction approach is considered a straightforward, affordable, and scalable technique [12]. Although the preparation of Cu 2 O-Cu nanoparticles has advanced significantly, this technique only works at low copper ion concentrations (<1,000 mg.l −1 ).…”