Double doping approach for unusually stable and large n-type thermoelectric voltage from p-type multi-walled carbon nanotube mats

Abstract

<p>Multi-walled carbon nanotubes (MWCNTs) have shown low n-type Seebeck coefficients (−10 μV K⁻¹), which are not good enough to prepare high performance low-cost MWCNT based mechanically flexible thermoelectric devices.</p>

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

“…the work function of pure gold was measured to be 5.27 eV (Figure S6), which is in the range of previously reported values, 5.0 eV-5.4 eV. 6,48,49,50 The electronic band diagrams of DPPTTT and P3HT during the FeCl3 doping process are respectively shown in Figure 3g and 3h. The Fermi level was obtained from the above work function WF = E vac -E F (E vac is vacuum level which typically equals zero) since the work function represents the energy barrier required for an electron to move at the Fermi level to free space.…”

Revisiting doping mechanisms of n-type organic materials with N-DMBI for thermoelectric applications: Photo-activation, thermal activation, and air stability

“…To tackle air-instability of n-dopants, the solution-processable small molecule (4 (1,3 dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl)dimethylamine (N-DMBI, named N-DMBI-H in this manuscript to emphasize the presence of the labile hydrogen atom) has been introduced as n-dopant precursor (Figure 1). 15 It was associated with various hosts such as carbon nanotubes 16 , conductive polymers 17 , and fullerene derivatives which led to the highest figure of merit ever reported for single-host organic thermoelectrics (ZT = 0.34 at 120°C). 18 We summarized some recent uses of N-DMBI-H in the organic thermoelectric field in Table S1.…”

Cu-ion-induced n- to p-type switching in organic thermoelectric polyazacycloalkane/carbon nanotubes

“…1,2 Fossil fuel energy loss is a critical problem associated with energy use, and effective recycling of this waste heat is critical to achieving a sustainable society. Carbon nanotube (CNT)-based materials, such as films, [3][4][5] mats, 6 and yarns, 7 can be used to directly convert heat into electricity and recover energy from waste heat at low temperatures. [8][9][10] In this manner, such materials can enhance energy utilization and help satisfy the demand for sustainable energy conversion technologies.…”