General Synthesis of Large-Scale Arrays of One-Dimensional Nanostructured Co₃O₄ Directly on Heterogeneous Substrates

Abstract

We have developed a general two-step synthesis of large-scale arrays of one-dimensional (1D) nanostructured Co3O4 directly on various substrates. Throughout a controllable hydrothermal process using urea as mineralizer and hereafter with a postcalcination process under air atmosphere, Co3O4 1D nanostructure arrays have been grown firmly on insulating substrates, such as glass slides and ceramics, which is quite convenient for the construction of gas sensor devices without any extra electrode preparation process. Furthermore, this direct-growth approach can be readily extended to conductive substrates (ITO, Ti, Fe−Co−Ni alloy), and meanwhile due to the robust mechanical adhesion and one-dimensional carrier transportation architecture firmly contacted to the metal, the metal substrate-supported Co3O4 arrays could act as a promising electrode material and be straightforwardly integrated into electronic and electrochemical nanodevices.

Bunched akaganeite nanorod arrays: Preparation and high-performance for flexible lithium-ion batteries

“…The design of this electrode material is based on the following considerations: (1) Compared to their counterpart with larger dimensions, 1D nanostructures have large surface area and possible quantumconfinement effects, and exhibit distinct electronic, chemical properties [21e23]. (2) Direct growth of ordered nanostructure array on current collector can avoid the usage of conductive additives and polymer binders, which has several advantages: simplifying the electrode processing, decreasing the contact resistance, increasing the charge transfer and ion transport, enhancing material-electrolyte contact area and accommodating the strains caused by Li þ insertion and extraction [24,25]. (3) Compared with metal substrates (alloy foil, Ti, Cu and Ni foam), as listed in Table 1, the carbon fiber cloth as current collector has better properties such as lightweight and stability [8,26e28].…”

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

“…Some broad categories of applications include solar energy harvesting, biosensing, and photocatalysis. [1][2][3][4][5][6][7][8][9] In recent years the spontaneous deformation of a thin film leading to nanoscale patterns governed by self-organizing principles have generated great interest. The reason is that by controlling the choice of materials, such as film and substrate, intrinsic forces of surface tension and dispersion can be changed to modify the time and length scales of pattern formation.…”

XAFS study on the impact of local structure on electrochemical performance for Co3O4nanowire arrays

“…The peaks near 779.7 and 790.3 eV, and 794.9 and 804.5 eV in the Co core spectra can be assigned to Co 2p3/2 and Co 2p1/2, respectively. Co 2p peak binding energy of Co 2 (OH) 2 CO 3 is higher than those in Co 3 O 4 [9].O1s spectra of the mixed phase sample displayed two peaks, which appeared in Co 3 …”

“…Spinel oxide Co 3 O 4 as an important p-type versatile semiconductor has been widely utilized in energy storage devices. Among various Co 3 O 4 electrodes, nanowire arrays electrode [2,3] is an eminent candidate because of its large surface area per unit volume, high utilization of the active sites, and excellent mass transport property.…”