A colloidal heterostructured quantum dot sensitized carbon nanotube–TiO₂ hybrid photoanode for high efficiency hydrogen generation

Abstract

A photoelectrochemical device based on a TiO2/QD–MWCNT (0.015 wt%) hybrid photoanode yields 40% higher photocurrent density than the control device.

Rapid preparation of polydopamine coating as a multifunctional hair dye

“…4 However, organic compounds with molecular masses of less than 500 Da, such as PPD, have been shown to easily cross the skin barrier and are regarded as human allergens and carcinogens. 5 To address this issue, some nontoxic nanomaterials, which are versatile in biomedical, [6][7][8] nano-engineering, 9,10 and clean energy 11,12 applications, have also been developed as safe dyeing agents. For example, Huang and coworkers found that graphene-based hair dyes could greatly shorten the dyeing time and improve antistatic performance.…”

Synergistic Effect of Plasmonic Gold Nanoparticles Decorated Carbon Nanotubes in Quantum Dots/TiO2 for Optoelectronic Devices

“…These results demonstrate that the Au NPs and CNTs did not undergo any structural changes while annealing the TiO 2 –Au, TiO 2 –CNTs, and TiO 2 –Au:CNTs hybrid photoanodes at 500 °C for 30 min under ambient conditions. [ 24c,26 ] The relative peak intensities of the D and G bands are lower compared to the same peaks before annealing. This lower intensity of D and G bands is due to a small amount of Au:CNTs hybrid network in TiO 2 NPs mesoporous film and conformal coverage of CNTs by TiO 2 NPs.…”

“…[ 25 ] The addition of a precise amount of CNTs in TiO 2 mesoporous paste boosts the performance of solar technologies thanks to improved electron transport and reduced carrier recombination within the photoanode. [ 24c,26 ] Recently, Lee et al. demonstrated that plasmonic metal NPs–CNTs hybrid networks lead to significant suppression of charge trapping and related nonradiative recombination that are typical of plasmonic NPs.…”

Tailoring the Heterostructure of Colloidal Quantum Dots for Ratiometric Optical Nanothermometry

“…[21,31,35,38,43,47,48,[51][52][53][54][55][56][57][58][59][60][61][62][63] QDs have size/shape/composition tunable absorption/emission spectrum from the visible to the near infrared (NIR) range, narrow emission peak width, high absorption coefficient, high QY, excellent photostability, and simple synthetic approach. [64][65][66][67][68][69][70][71] Single-emission QDs have been widely used as thermal sensors; however, the optical properties of QDs are affected by many factors, other than temperature itself, and the sensitivity of QD-based thermal sensors is still relatively weak. [11,72,73] Compared with thermal sensors based on single-emission QDs, [21,54,72,74,75] ratiometric optical thermometry allows self-calibration of the system with improved robustness and reliability.…”

“…[66][67][68][69][70][71]76] Usually, they are composed of an inorganic core, made up of between a few hundred and a few thousand atoms, surrounded by an organic external layer of surfactant molecules. [62,[66][67][68][69][70][71] QDs exhibit strong quantum confinement effects, leading to size/shape/composition-dependent optical properties. [76,77] It is possible to tune the discrete electronic states during the synthesis of complex QD structures in a controlled way, by modulating QD size, shape, and chemical composition, to obtain the desired optical transitions and related PL properties.…”