Enhanced Thermoelectric Properties of Two-dimensional Planar Copper Polyphthalocyanine by Dispersing Single-walled Carbon Nanotubes

doi:10.15541/jim20250089

Abstract

Abstract:

Two-dimensional planar metal polyphthalocyanine is considered a kind of promising organic thermoelectric material due to its unique molecular structure and high carrier mobility, but its low carrier concentration and low electrical conductivity impede improvement of thermoelectric performance. In this work, copper polyphthalocyanine/single-walled carbon nanotubes (CuPPc/SWCNTs) composites were prepared by in-situ polymerization and mechanical ball-milling, respectively. As compared with ball-milled sample (BM-CuPPc/SWCNTs), in-situ polymerized sample (IS-CuPPc/SWCNTs) presents strong π-π conjugation between CuPPc and SWCNTs, which can effectively reduce the interfacial resistance between CuPPc and SWCNTs. Therefore, IS-CuPPc/SWCNTs shows higher electrical conductivity than BM-CuPPc/SWCNTs at high SWCNTs concentration. With 80% (in mass) SWCNTs, the electrical conductivity of IS-CuPPc/SWCNTs reaches 1.31×10⁴ S·m^-1, 30% higher than that of BM-CuPPc/SWCNTs, and six orders of magnitude higher than that of pure CuPPc. Meanwhile, the maximum thermoelectric power factor of IS-CuPPc/SWCNTs reaches 18.24 μW·m^-1·K^-2, which is higher than that of BM-CuPPc/SWCNTs and surpasses that of pure CuPPc by six orders of magnitude. This study provides an effective way to enhance the thermoelectric properties of metallic polyphthalocyanine.

Key words: copper polyphthalocyanine, carbon nanotube, composite, thermoelectric property

CLC Number:

TB34

HU Yuchen, XU Zishuo, HU Yuejuan, CHEN Lidong, YAO Qin. Enhanced Thermoelectric Properties of Two-dimensional Planar Copper Polyphthalocyanine by Dispersing Single-walled Carbon Nanotubes[J]. Journal of Inorganic Materials, 2026, 41(1): 63-69.

Figures/Tables 8

Fig. 1 Molecular structural formula of metal polyphthalocyanine

Fig. 2 Schematic diagrams of the preparation process of CuPPc/SWCNTs composites (a) In-situ polymerization method; (b) Mechanical ball-milling method

Fig. 3 TEM and SEM images of IS-CuPPc/SWCNTs and BM-CuPPc/SWCNTs composites (a-d) TEM images of (a, b) IS-CuPPc/40%SWCNTs powder and (c, d) BM-CuPPc/60%SWCNTs powder; (e-g) SEM images of cross-sections of (e) IS-CuPPc/10%SWCNTs, (f) IS-CuPPc/60%SWCNTs and (g) IS-CuPPc/80%SWCNTs composite block; (h-j) SEM images of cross-sections of (h) BM-CuPPc/10%SWCNTs, (i) BM-CuPPc/60%SWCNTs and (j) BM-CuPPc/80%SWCNTs composite block

Fig. 4 Electrical transport properties of IS-CuPPc/SWCNTs and BM-CuPPc/SWCNTs samples with different SWCNTs mass fractions (a) Electrical conductivity; (b) Seebeck coefficient; (c) Thermoelectric power factor

Fig. 5 High-resolution Cu2p XPS spectra of CuPPc, IS-CuPPc/xSWCNTs (x=40%, 60%, 80%) and BM-CuPPc/ySWCNTs (y=40%, 60%, 80%) (a) CuPPc; (b) CuPPc and IS-CuPPc/xSWCNTs (x=40%, 60%, 80%); (c) CuPPc and BM-CuPPc/ySWCNTs (y=40%, 60%, 80%)

Fig. 6 Raman spectra of CuPPc, SWCNTs, IS-CuPPc/ 20%SWCNTs, and BM-CuPPc/20%SWCNTs samples

Fig. 7 Schematic diagram of the electrical transport mechanism of IS-CuPPc/SWCNTs

Fig. S1 FT-IR spectra of pure CuPPc powder

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