Synthesis, characterization, and photoluminescence property of Nd–TUD‐1

Abstract

Here, five different samples of neodymium (Nd) incorporated 3D‐mesoporous siliceous materials were fabricated using a single‐step hydrothermal technique. Typically, all samples were subjected to several qualitative elemental and quantitative analyses such as X‐ray diffraction, N2‐adsorption/desorption, scanning electron microscopy, energy dispersive X‐ray, mapping, high resolution transmission electron microscopy, diffuse reflectance ultraviolet–visible, and Raman spectroscopy. The characterization results showed that at small loading of Nd (i.e. Si/Nd < 20), only isolated centres of trivalent neodymium ions were tetrahedrally coordinated in the TUD‐1 matrix. However, with increasing neodymium loading, additional nanoparticles of neodymium oxide with size 10–20 nm were embedded into silica host pores. Detailed photoluminescence (PL) analysis of all samples was carried out by recording the emission profiles at two diverse excitation wavelengths, 333 and 343 nm, to understand the effect of the Nd3+ environment on the PL emission spectra with special attention to the area between 400 and 600 nm. Most importantly, different peaks of the emission spectrum of each sample exhibited a distinct shape based on the Nd3+ environment. This performance was superior evidence that PL can be applied as a simple and efficient characterization tool to understand the nature of Nd3+ ion linkage with a silica matrix.

A three-dimensional ZnO/TUD-1 nanocomposite-based multifunctional sensor for humidity detection and wastewater remediation

“…5(a and b), pristine TUD-1 displayed flake-like structures of non-uniform sizes at a resolution of 20 μm. 36 However, at a higher resolution of 200 nm, the micrographs revealed silica particles with a fluffy, cotton-like structure. Fig.…”

“…Nanocomposites with various zinc oxide compositions were synthesized following a similar procedure as discussed above with the addition of required amounts of zinc nitrate hexahydrate salt solutions to the initially diluted TEA. [5][6][7][8]…”

“…[3][4][5] The concept of resistancebased humidity sensors hinges on the electrical properties of the sensing material, as the RH of the surrounding environment changes, and the electrical conductivity of the sensing material is altered. [6][7][8] This change in conductivity is harnessed to provide a quantitative measure of humidity.…”

A travel though the atrane route, a versatile tool for the materials soft‐synthesis: A twenty‐five years perspective

“…There is a wide variety of silicas with TUD-1 structure containing heteroatoms prepared including the corresponding salts or alkoxides in the synthesis process. Examples of TUD-1 containing Al, [106] Au, [107] B, [108] Bi, [109] Ce, [110] Co, [111] Cr, [112] Fe, [113] Ga, [114] In, [115] Ln, [116] Mo, [117] Na, [118] Nd, [119] Ni, [120] Pd, [121] Rh, [122] Sn, [123] Ti, [124] o Zr [125] can be found in the literature.…”

“…[121] Other applications include photocatalysis, [113,137,138] or photoluminescence with bismute materials, [109] lantane, [116] or neodinium. [119] In the latter, small loading of Nd (i.e., Si/Nd > 20) only generates isolated centers of trivalent neodymium ions tetrahedrally coordinated in the TUD-1 matrix. However, if the neodymium loading is increased, nanoparticles of neodymium oxide with size 10-20 nm are formed into silica pores.…”