Surfactant-assisted solvothermal synthesis of single-crystalline ternary Bi–Sb–Te hexagonal nanoplates

Significantly enhanced thermoelectric performance of Cu-doped p-type Bi0.5Sb1.5Te3 by a hydrothermal synthesis method

“…The Bi 2 Te 3 compound has a rhombohedra structure 32 with the space group R 3m, wherein along the c-axis, the atomic layers array in the order of -Te(1)-Bi-Te(2)-Bi-Te(1)-and the neighboring Te(1) layers are linked by weak van der Waals bonds. [34][35][36][37] Therefore, the morphology of Bi 2 Te 3 -based alloy normally exhibits the feature of hexagonal platelets. For the powders obtained in our work, under the control of hydrothermal synthesis, most of grains are nanoparticles with decient crystallinity, while only a small number of grains are well-crystallized, existing as hexagonal platelets.…”

“…18,34,35 Furthermore, the reported room-temperature thermoelectric properties of the Bi 2 Te 3 -based alloy synthesized by the hydrothermal method are not as good as expected. 18,35,37 Therefore, it is desirable to develop a facile hydrothermal method to prepare an ideal single-phase Bi 0.5 Sb 1.5 Te 3 alloy with optimized thermoelectric properties.…”

Formation of randomly distributed nano-tubes, -rods and -plates of n-type and p-type bismuth telluride via molecular legation

“…The van-der-waal bonding between Te(1)-Te(1) atoms of the molecules provide additional freedom of orientations. This not only results in nanoplates of sizes restricted to few nm to few hundred nm, as usually happens [1,11,12,17], but also dense rod like feature and hollow tube like features. The mixer of different morphological features might also be attributable to different co-existing solvents having different ionizing powers for crystallization.…”

“…Recently, synthesis of bismuth telluride based thermoelectric nanomaterials in different morphology has attracted lot of interest [1][2][3][4][5][6][7][8][9][10][11][12]. This interest is driven by the performance enhancement of the thermoelectric nanomaterials in diverse morphology at nanoscale [4,13].…”

“…In addition, these processes have been applied mostly to binary bismuth telluride [2][3][4][5][6][7][8][9][10]. However, there are few reports on synthesis of ternary alloys [1,11,12], but these processes yielded platy structure. Of course, nanorod [8] and nanotube [13] morphology have also been obtained in binary bismuth telluride.…”