Ultra-low thermal conductivity and thermoelectric properties of polymer-mixed Bi2Te3 nanofibers by electrospinning

Thermoelectric properties of polyvinylpyrrolidone/polyaniline‐mixed Bi2Te3 composites prepared by electrospinning

“…The peak at 3391 cm −1 corresponds to O–H bond. [ 18 ] There are no chemical remnants or metal oxide impurities left over from the coprecipitate synthesis visible in the weak Bi 2 Te 3 peaks. This was also confirmed by XRD.…”

“…Non conducting polymers usually have lower thermal conductivity due to absence of electrons and high phonon scattering. [ 18,19,30,50 ] This is due to the fiber's random orientation and high porosity between composite particles in the fibers. Equation () can be used to gain an understanding of how fibers achieve their thermal conductivity. where, k /Ko is the thermal conductance of the composite (Bi 2 Te 3 and PANI), n fi is the number of composite in a cross‐section area, <D> is the average distance between two composites particles, θ is the angle between heat flow and fiber direction and Nb is a dimensionless equation (Biot number) that describes the competing effect of interfiller thermal contact resistance and intrinsic filler thermal resistance.…”

“…Non conducting polymers usually have lower thermal conductivity due to absence of electrons and high phonon scattering. [18,19,30,50] This is due to the fiber's random orientation and high porosity between composite particles in the fibers. Equation ( 9) can be used to gain an understanding of how fibers achieve their thermal conductivity.…”

“…[11][12][13][14][15] Because of their high performance around ambient temperature, antimony telluride (Sb 2 Te 3 ) and bismuth telluride (Bi 2 Te 3 ) are widely employed thermoelectric material. [16][17][18][19][20] Conversely, in 2013 Xu et al [14] fabricate thin film thermoelectric devices out of p-type and n-type conducting polymers and reported a zT value of 0.5 at 147 C. which is nearly equal to the zT value of Bi 2 Te 3 near room temperature.…”

Polymer-mixed Sb2Te3/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

“…By using inorganic-organic composites, bilateral benefits of good electrical conductivity with enhanced Seebeck coefficient by decoupling σ and S through an energy filtering effect and with low thermal conductivity can be achieved. Several groups have demonstrated the improved thermoelectric properties of using inorganic material and polymer composites [29][30][31][32][33][34][35][36][37].…”