Stable Doping of Single-Walled Carbon Nanotubes for Flexible Transparent Conductive Films

Abstract

Possessing excellent electronic and mechanical properties and great stability, single-walled carbon nanotubes (SWCNTs) are exceptionally attractive in fabricating flexible transparent conductive films. Doping is a key step to further enhance the conductivity of the SWCNT films and the reliable doping is highly needed. We developed a feasible strategy that uses solid acids such as phosphotungstic acid (PTA) to dope the SWCNT films stably relying on the nonvolatility of the dopants. The sheet resistance of the films was reduced to around a half of the original value meanwhile with no obvious change in transmittance. The doping effect maintained during a 700 days' observation. The excellent flexibility of the PTA-doped films was demonstrated by a bending test of 1000 cycles, during which the sheet resistance and transmittance was basically unaffected. The blue shifts of G band in the Raman spectra and the increase of work function measured by the Kelvin probe force microscopy both reveal the p-type doping of the films by PTA. The strong acidity of PTA plays a key role in the doping effect by increasing the redox potential of the ambient O 2 and thus the Fermi level of the SWCNTs is brought down. The great feasibility and robustness of our doping strategy are desirable in the practical application of SWCNT-based flexible transparent conductive films. This strategy can be extended to the p-type doping of various CNT-based assemblies (such as sponges and forests) as well as other material families, expanding the application spectrum of polyacids.

Facile fabrication of large-scale silver nanowire transparent conductive films by screen printing

“…Metal nanowires based TCFs possess better electrical conductivity due to the excellent electrical conductivity of metal nanowires. Therefore, metal nanowires are ideal materials to replace indium tin oxide (ITO) [10,11], carbon nanotubes [12], graphene [13,14] and conductive polymers [ [15] to fabricate TCFs. Among metal nanowires, silver nanowires (AgNW) is the most promising candidate owing to excellent conductivity, relatively low cost and convenient fabrication [16][17][18][19][20][21][22][23][24].…”

Enhanced Water Resistance and Catalytic Performance of Ru/TiO2 by Regulating Brønsted Acid and Oxygen Vacancy for the Oxidative Removal of 1,2-Dichloroethane and Toluene

“…22 To improve the stability of the HPA-containing catalysts, some researchers used the impregnation method to load the HPA monolayer onto the surface of a support, in which the interaction between HPAs and support could maintain the stability of the catalyst. 23,24 Most of the research works on the catalytic oxidation of VOCs have been mainly focused on the removal of single pollutants, but the actual compositions of waste gases are rather complex, including CVOCs, cyclic derivatives, oxygenated derivatives, hydrocarbons, etc. Some references related to the catalytic oxidation of multicomponent VOCs containing CVOCs over different catalysts are shown in Table S1.…”

“…Usually, the stability of the commonly used HPAs decreases in the order of H 3 PW 12 O 40 (HPW) > H 4 SiW 12 O 40 (HSiW) > H 3 PMo 12 O 40 (HPMo) > H 4 SiMo 12 O 40 (HSiMo) . To improve the stability of the HPA-containing catalysts, some researchers used the impregnation method to load the HPA monolayer onto the surface of a support, in which the interaction between HPAs and support could maintain the stability of the catalyst. , …”

Polyoxometalate steric hindrance driven chirality-selective separation of subnanometer carbon nanotubes

“…Polyoxometalates, which possess enormously versatile structures and compositions, 61,62 are considered to be ideal electron acceptors when electrostatically bonding with electron donors such as SWCNTs. [63][64][65][66][67][68][69] For example, Newton et al recently reported that polyoxometalates are spontaneously encapsulated by SWCNTs, driven by a redox reaction between the polyoxometalates and the SWCNTs. These redox materials exhibit exceptional electrochemical stability.…”