Supporting Information

Transcription

1 Supporting Information Foldale Thermoelectric Materials: Improvement of the Thermoelectric Performance of Directly Spun CNT Wes y Individual Control of Electrical and Thermal Conductivity Cheng Jin An 1, Young Hun Kang 1, A-Young Lee 2, Kwang-Suk Jang 1, Youngjin Jeong 2, and Song Yun Cho 1 * 1 Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Repulic of Korea 2 Department of Organic Materials and Fier Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 6978, South Korea KEYWORDS: CNT we; gold dopant; conducting polymers; thermoelectrics; flexile thermoelectric generator * scho@krict.re.kr S-1

2 Additional figures and tale a c Pristine 1 mm Au doping e d 2 mm Au doping f cps/ev 5 mm Au doping 1 mm Au doping Au-MA Au kev Figure S1. SEM images of Au-doped CNT wes with different Au dopant concentrations. (a) Pristine CNT we, () 1 mm Au doped CNT we, (c) 2 mm Au doped CNT we, (d) 5 mm Au doped CNT we, (e) 1 mm Au doped CNT we, and (f) EDXS mapping image with the EDXS spectrum in the inset of 2 mm Au doped CNT we. The Au coating was controlled y adjusting the concentration of the Au-dopant solution while maintaining a constant dipping time. The size of the Au NPs increased as the Au dopant concentration increased. S-2

3 Seeeck Coefficient (µv K -1 ) T (K) Pristine 1 mm 2 mm 5 mm 1 mm Seeeck Coefficient (µv K -1 ) Pristine Au Concentration (mm) Electrical Conductivity (S cm -1 ) Power Factor (µw m -1 K -1 ) Figure S2. (a) Seeeck coefficient versus temperature for Au-doped CNT wes depending on Au dopant concentrations. The inset is a photograph of the Au dopant solutions at different concentrations as designated. () Seeeck coefficient (red filled circles), electrical conductivity (lue filled circles), and corresponding power factor (green filled circles) versus Au dopant concentration. The Seeeck coefficient is inversely proportional to the electrical conductivity. S-3

4 Intensity (a. u.) CNT Au-doped CNT Au-doped CNT/P3HT Au-doped CNT/PANI C element Intensity (a. u.) CNT Au-doped CNT Au-doped CNT/P3HT Au-doped CNT/PANI Au element c Intensity (a. u.) Binding Energy (ev) CNT Au-doped CNT Au-doped CNT/P3HT Au-doped CNT/PANI N element d Intensity (a. u.) Binding Energy (ev) S element CNT Au-doped CNT Au-doped CNT/P3HT Au-doped CNT/PANI Binding Energy (ev) Binding Energy (ev) Figure S3. XPS spectra for CNT we, Au-doped CNT we, Au-doped CNT/P3HT we, and Au-doped CNT/PANI we. The peaks at 284.8, 84.2, 4.9, and correspond to the C 1s, Au 1s, N 1s, S1s in the wes. (a) All samples show intensive caron peaks and shadow peak was decreased with Au treatment and polymer infiltration. () Au was detected from all samples except for pristine CNT we. (c) Nitrogen was detected from Au-doped CNT/PANI wes, confirming the presence of PANI. (d) Sulfur was detected from Au-doped CNT/P3HT we, confirming P3HT in the we. S-4

5 Seeeck Coefficient (µv K -1 ) P3HT FeCl 3 -doped P3HT PANI CSA-doped PANI T (K) Seeeck Coefficient (µv K -1 ) PANI P3HT CSA-doped PANI FeCl3-doped P3HT Electrical Conductivity (S cm -1 ) Power Factor (µw m -1 K -1 ) Figure S4. (a) Seeeck coefficient versus temperature depending on the various treated polymers on Au-doped CNT wes. () Seeeck coefficient (red column), electrical conductivity (lue column), and corresponding power factor (green column) versus the treated conducting polymers. The PANI treated Au-doped CNT we exhiits the highest power factor among other polymers. S-5

6 Figure S5. Weight measurement of (a) Au-doped CNT/PANI we and () feather for the comparison. Au-doped CNT/PANI we exhiits 5 times lighter weight than feather with similar size. S-6

7 Seeeck Coefficient (µv K -1 ) PEI TPP T (K) Pristine PEI TPP Seeeck Coefficient (µv K -1 ) Pristine CNT PEI doped CNT TPP doped CNT Electrical Conductivity (S cm -1 ) Power Factor (µw m -1 K -1 ) Figure S6. (a) Seeeck coefficient versus temperature for n-type CNT wes doped with polyethyleneimine (PEI) and triphenylphosphine (TPP). Inset presents the molecular structure of n-type dopants. () Seeeck coefficient (red column), electrical conductivity (lue column), and corresponding power factor (green column) versus the different n-type dopants. PEI-doped CNT we shows higher power factor than TPP with higher electrical conductivity. S-7

8 Figure S7. Photographs of (a) flexile p-type TEG, which is composed of 14 legs of Audoped CNT/PANI wes on a PET sustrate and () flexile p-n TEG where the p-type legs are alternatively connected with PEI-doped n-type legs in serials. S-8

9 c Temperature detectors Voltage detectors Hot Cold Thermo- Couple 2 Thermo- Couple 1 Proe 1 Proe 2 Controller for Peltier plate d Voltage (V) Proe Equation y = a + *x Weight No Weightin Residual Su E-1 Pearson's r Adj. R-Squar Value Standard Err B Intercept E E-6 B Slope E E T (K) Figure S8. (a) Optical image of sample prepared for Seeeck coefficient measurement. () Experimental setup for the Seeeck coefficient measurement. (c) Detectors for temperature and voltage and temperature controller for Peltier plate. (d) A typical curve of thermoelectric voltage versus temperature gradient for Au-doped CNT/PANI we. S-9

10 Tale S1. Thermal Conductivity, κ, and Related Data of CNT Wes at 3 K CNT we α [mm 2 s -1 ] C p [J g -1 K -1 ] ρ [g cm -3 ] k [W m -1 K -1 ] Pristine CNT we 18 ±.2.77 ±.3.41 ± ±.25 Au-doped CNT we 2.9 ±.3.79 ±.4.43 ± ±.32 Au-doped CNT/P3HT we 8.98 ± ±.3.45 ± ±.21 Au-doped CNT/PANI we 8.6 ± ±.2.44 ± ±.15 S-1