Hydrothermal Synthesis of Prismatic NaHoF₄ Microtubes and NaSmF₄ Nanotubes

Abstract

A new example of tubular materials based on sodium rare-earth tetrafluorides, NaHoF(4) and NaSmF(4), has been fabricated by a simple hydrothermal method. In addition, an unusual nanotube with a perfect couple of an outer prismatic shell with an inner concentric prismatic nanorod at the center is found. According to the architectures of various products, the general growth mechanism of these tubes is proposed.

Controllable Synthesis and Luminescence Properties of La(OH)3 and La(OH)3:Tb3+ Nanocrystals with Multiform Morphologies

“…[1][2][3][4][5][6][7][8][9] Several strategies have been developed for the growth of 1D nanostructure materials, such as electrochemical methods, [10] template-directed growth technique, [11] vapor-liquid-solid (VLS) synthesis, [12] vapor-solid (VS) method, [13] and hydrothermal process. [1][2][3][14][15][16][17] Among the various synthesis techniques, the hydrothermal process is a powerful method for the fabrication of anisotropic nanomaterials, owing to their great chemical flexibility and synthetic tenability. The advantages of hydrothermal synthesis make it another choice besides the template method.…”

“…[2,3,[20][21][22][23][24] If rare-earth compounds were fabricated in the form of a 1D nanostructure, they would be expected to be highly functionalized materials, acting as electrically, magnetically, or optically functional host materials as well. [15,[25][26][27] So far, there have been many reports about 1D lanthanide compounds obtained by various synthesis methods.…”

“…[15,[25][26][27] So far, there have been many reports about 1D lanthanide compounds obtained by various synthesis methods. [18,19,[28][29][30] Among them, lanthanum hydroxide [La-(OH) 3 ] is of great research interest, and it has been used in many fields, such as catalysis, sorbent materials, high potential oxide ceramics, superconductive materials, hydrogen storage materials, electrode materials, and so on. [31][32][33][34] In previous research, 1D La(OH) 3 samples, such as nanowires and nanobelts, have been prepared by the hydrothermal method under strongly alkaline conditions.…”

“…[18,19,[28][29][30] Among them, lanthanum hydroxide [La-(OH) 3 ] is of great research interest, and it has been used in many fields, such as catalysis, sorbent materials, high potential oxide ceramics, superconductive materials, hydrogen storage materials, electrode materials, and so on. [31][32][33][34] In previous research, 1D La(OH) 3 samples, such as nanowires and nanobelts, have been prepared by the hydrothermal method under strongly alkaline conditions. [1,15,31] However, to the best of our knowledge, little has been done on the systematic manipulation of morphologies of uniform and well-dispersed 1D La(OH) 3 materials through the simple hydrothermal process under mildly alkaline conditions.…”

“…The morphologies of the products could be modulated by simply adjusting the pH values of the initial solution or by using different kinds of alkaline sources. Furthermore, the photoluminescence (PL) and cathodoluminescence (CL) properties of the La(OH) 3 :Tb 3+ green phosphors have been discussed in detail. Figure 1a,b shows the XRD patterns of the La(OH) 3 samples prepared at pH 7 and 9 by using ammonia as the alkaline source.…”