Enhanced Thermoelectric Properties of a Semiconducting Two-Dimensional Metal–Organic Framework via Iodine Loading

Abstract

We report the first result of a study in which molecular iodine has been incorporated via incipient wetness impregnation into the two-dimensional semiconducting metal−organic framework (MOF) Cu 3 (2,3,6,7,10,11-hexahydroxytriphenylene) 2 Cu 3 (HHTP) 2 to enhance its thermoelectric properties. A power factor of 0.757 μW m −1 K −2 for this MOF was obtained which demonstrates that this provides an effective route for the preparation of moderate-performance thermoelectric MOFs.

Toward Enhancing Performance of Electromagnetic Wave Absorption for Conductive Metal–Organic Frameworks: Nanostructure Engineering or Crystal Morphology Controlling

“…The C 1s spectrum peaks at 284.8, 286.2, and 288.7 eV can be attributed to the presence of C−C/C�C (from the π−π conjugated benzene ring), C−O, and C�O bonds, respectively (Figures 3c and S1a1,b1). 43,44 Also, the characteristic peaks at 531.94, 533.69, and 536.1 eV, observed in the O 1s spectrum (Figures 3d and S1a2,b2), correspond to C−O, C�O (from deprotonated organic ligands undergoing continuous redox during the synthesis process) and π−π*, respectively. 45,46 The FT-IR spectra further confirm the existence of functional groups, as shown in Figure S2a.…”

Recent advances of 2D conductive metal–organic frameworks in thermoelectrics

“…26 The Seebeck coefficients of 2D c-MOFs were also dependent on the processing conditions, where thin lms showed higher Seebeck coefficients than bulk-pressed pellets (Table 2). 111,119,173 For example, Bradshaw et al used the same method to test the Seebeck coefficient of 2D c-MOF Cu 3 (HHTP) 2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) lms and pellet samples, respectively. The absolute Seebeck coefficient of Cu 3 (HHTP) 2 lm (−121.4 mV K −1 ) was larger than that of the pellet sample (−7.24 mV K −1 ), as shown in Fig.…”

“…12). 111 Bradshaw and coworkers adsorbed water molecules in Cu 3 (HHTP) 2 pores to produce excessive O doping, which transformed the Seebeck coefficient of 2D c-MOF from −117 μV K −1 to 269.5 μV K −1 , realizing a change in carrier polarity. Although the electrical conductivity of the doped MOF exhibited a decrease during the doping process with the carrier concentration decreasing from −6.41 × 10 16 to +2.47 × 10 14 cm −3 , and the mobility changing from 0.364 to 0.298 cm 2 V −1 s −1 , the PF of H 2 O@Cu 3 (HHTP) 2 film had been improved by about 40%.…”