Room-Temperature Synthesis and Optical Properties of NdVO4 Nanoneedles

Abstract

Tetragonal NdVO 4 nanoneedles were prepared via a simple room-temperature precipitation method in the absence of any surfactant or template, starting from simple inorganic salts, NdCl 3 and Na 3 VO 4 , as raw materials. The nanoneedles were characterized by XRPD, SEM, Raman, PL, and lifetime spectroscopy. The particles have a length of about 100 nm and a diameter of 20 nm and grow along <112> direction. The advantages of this method lie in the high yield, non-toxic solvents, mild reaction conditions, and that it can potentially be employed for the preparation of other 1D lanthanide vanadates.

Pressure Effects on the Optical Properties of NdVO4

“…They likely correspond to transitions from 4 I 9/2 to 4 G 11/2 , 4 G 9/2 , 4 G 7/2 , 4 F 9/2 , 4 G 5/2 , 4 F 7/2 , 4 F 5/2 , and 4 F 3/2 , respectively [35]. The features at long wavelengths are the strongest and have been previously reported [6][7][8][9][10]. Among the others, only the absorption band centered at 359 nm has been previously reported, even if mistakenly assigned to the fundamental band-gap of NdVO 4 [8].…”

“…Among the others, only the absorption band centered at 359 nm has been previously reported, even if mistakenly assigned to the fundamental band-gap of NdVO4 [8]. This leads to the underestimation of the band gap, with values from ranging 2.95 to 3.5 eV [6][7][8][9][10]. The band gap of NdVO4 measured in our experiment is larger (3.72 eV), compatible with the band gap of rare-earth vanadates, and its value is determined by the classical field splitting of the The rest of the absorption features observed in our experiment (A 1 to A 8 in Figure 3) can be correlated to transitions between 4f 3 levels of Nd 3+ .…”

“…Neodymium vanadate (NdVO 4 ) is one of the most promising orthovanadates for the development of technological applications [1][2][3][4][5][6], for which an accurate knowledge of NdVO 4 optical properties is a fundamental requisite. Several studies have been carried out on the optical properties of NdVO 4 [6][7][8][9][10][11], mainly focused on the study of the band-gap energy and the optical absorptions associated to internal transitions of Nd 3+ ions from 4 I 9/2 to 4 G 5/2 , 4 F 7/2 , 4 F 5/2 , and 4 F 3/2 [12]. Discrepancies on the value of the fundamental band gap (E gap ) can be found in the literature [6][7][8][9][10][11], with values of the E gap ranging from 2.95 to 3.72 eV.…”

“…Several studies have been carried out on the optical properties of NdVO 4 [6][7][8][9][10][11], mainly focused on the study of the band-gap energy and the optical absorptions associated to internal transitions of Nd 3+ ions from 4 I 9/2 to 4 G 5/2 , 4 F 7/2 , 4 F 5/2 , and 4 F 3/2 [12]. Discrepancies on the value of the fundamental band gap (E gap ) can be found in the literature [6][7][8][9][10][11], with values of the E gap ranging from 2.95 to 3.72 eV. Consequently, new studies are needed to accurately determine this parameter, which is crucial for the understanding of the properties of this wide gap semiconductor.…”

The Use of Diatoms in the Synthesis of New 3D Micro-Nanostructured Composites (SiO2/CaCO3/Corg/NdVO4NPs and SiO2/CaO/Corg/NdVO4NPs) Exhibiting an Intense Anti-Stokes Photoluminescence

“…These crystallise in a tetragonal structure formed of a slightly distorted tetrahedral VO 4 3− ion and a rare earth ion Nd 3+ between adjacent tetrahedrons. Each Nd 3+ ion is dihedrally surrounded by eight oxygen ions [ 12 ].…”