TY - JOUR
T1 - Bismuth Telluride (Bi2Te3) nanocrystallites
T2 - Studies on growth morphology and its influence on the thermoelectric properties
AU - Vinoth, S.
AU - Karthikeyan, Vaithinathan
AU - Roy, Vellaisamy A.L.
AU - Srinivasan, Bhuvanesh
AU - Thilakan, P.
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/3/15
Y1 - 2023/3/15
N2 - Growth of Bismuth Telluride (Bi2Te3) nanocrystallites by solvothermal method resulted in an incomplete hexagonal flake-like (BTFL) structure for surfactant-free growth and complete hexagonal morphologies (BTHP) for the PVP surfactant mixed growth respectively identified through FESEM studies. XRD characterization revealed the crystallization of pure phase of Bi2Te3 at 210 °C for PVP-free growth and at 200 °C for PVP-assisted growth. Raman studies shows a noticeable difference in the appearance of peak positions for hexagonal nanoplatelets. Laser flash measurement of total thermal conductivity (κtot) resulted in the lowest value of 0.39 Wm−1K−1 for the BTFL pellet and 0.44 Wm−1K−1 for BTHP. Estimated lattice thermal conductivity resulted in 0.16 Wm−1K−1 for BTFL pellet and 0.25 Wm−1K−1 for the BTHP pellet. Temperature-dependent electrical conductivity studies reveal semiconductor behaviour for BTFL pellet and semi-metallic behaviour for BTHP pellet. Calculation of figure of merit (ZT) based on the measured values exhibits ZT value of 0.76 for BTFL and 0.64 for BTHP pellet. Details are presented in this paper.
AB - Growth of Bismuth Telluride (Bi2Te3) nanocrystallites by solvothermal method resulted in an incomplete hexagonal flake-like (BTFL) structure for surfactant-free growth and complete hexagonal morphologies (BTHP) for the PVP surfactant mixed growth respectively identified through FESEM studies. XRD characterization revealed the crystallization of pure phase of Bi2Te3 at 210 °C for PVP-free growth and at 200 °C for PVP-assisted growth. Raman studies shows a noticeable difference in the appearance of peak positions for hexagonal nanoplatelets. Laser flash measurement of total thermal conductivity (κtot) resulted in the lowest value of 0.39 Wm−1K−1 for the BTFL pellet and 0.44 Wm−1K−1 for BTHP. Estimated lattice thermal conductivity resulted in 0.16 Wm−1K−1 for BTFL pellet and 0.25 Wm−1K−1 for the BTHP pellet. Temperature-dependent electrical conductivity studies reveal semiconductor behaviour for BTFL pellet and semi-metallic behaviour for BTHP pellet. Calculation of figure of merit (ZT) based on the measured values exhibits ZT value of 0.76 for BTFL and 0.64 for BTHP pellet. Details are presented in this paper.
KW - A1. Crystal morphology
KW - A1. Crystallites
KW - A1. Nanostructures
KW - A2. Hydrothermal crystal growth
KW - B1. Bismuth compounds
UR - http://www.scopus.com/inward/record.url?scp=85147028823&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2023.127087
DO - 10.1016/j.jcrysgro.2023.127087
M3 - Article
AN - SCOPUS:85147028823
SN - 0022-0248
VL - 606
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
M1 - 127087
ER -