Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

Abstract

Artificially grown superstructures from small building blocks is an intriguing subject in 'bottom-up' molecular science and nanotechnology. Although discrete nanoparticles with different morphologies and physicochemical properties are readily produced, assembly them into higher-order structure amenable to practical applications is still a considerable challenge. This report introduces a stepwise heterogeneous approach for coupling colloidal quantum dots (QDs) synthesis with self-organization to directly generate quantum chains (QCs). By using vulcanized sulfur precursors, QDs are interdigitated into microscale chainlike supracrystals associated with oleylamine and oleic acid as structure directing agents. The cooperative nature of the QD growth and assembly have been extended to fabricate binary (PbS) and ternary metal

Molecular interaction balanced one- and two-dimensional hybrid nanoarchitectures for high-performance supercapacitors

“…The Nyquist plots are fitted with a typical equivalent circuit (inset) for extracting charge transfer (i.e., high-frequency semicircles) and ion diffusion (i.e., lowfrequency straight lines) parameters. 9 As highlighted in Figure 4(c), Ox-CNT electrode shows a smaller diameter of the semicircle compared to CNT which indicates that the presence of the oxygen-containing groups can facilitate the charge transfer between the electrode and electrolyte 9,37 .…”

“…However, further enhancement of energy density in the recent development of EDLCs is gradually becoming difficult, owing to grand challenges in discovering new materials. [7][8][9] In principle, the capacitance and charge-discharge rates of EDLCs scale with surface area and electrical conductivity. Therefore, as far as electrodes can have i) a large electrochemically active specific surface area, ii) continuous channels for ion transport with appropriate pore size distribution, iii) high electrical conductivity, and good wettability 6,10 , considerable performance enhancement can be achieved from rationally designed material structures.…”

Quantum Dots Microstructural Metrology: From Time‐Resolved Spectroscopy to Spatially Resolved Electron Microscopy

“…The internal structure of the QD core can be investigated by HRTEM. [131,132] It is difficult to discriminate the core-shell interface from HRTEM images if the electron scattering cross-sections of core and shell are almost the same. When individual QD is examined by TEM, other than average crystal size, it provides much more information such as particle size, shape, crystal orientation, defects, and surface structures.…”

“…The self-assembly of colloidal semiconductor nanocrystals is one of the synthetic strategies used to pack the nanocrystals into superlattices that offer minimum average interparticle distance, and hence improve the device performance. [131] Therefore, characterization of superlattices in QD monolayers, especially information on morphology and interparticle distance, is significant, and grazing-incidence small-angle X-ray scattering (GISAXS) has emerged as a versatile and detailed characterization technique for understanding superlattice of QD monolayers. GISAXS can extract morphological information from QD monolayer surface and also from the buried structures.…”

Colloidal Quantum Dots: The Artificial Building Blocks for New‐Generation Photo‐Electronics and Photochemistry

“…[18] As an immediate relative technology, the development of QDbased photovoltaic, photocatalysis and photochemistry can benefit directly from the QD LEDs as highly promising technologies. [19,20,21,22] QDs have unique physical properties such as large spectral tunability, high ambient stability, high sensitivity, and quantum efficiency with narrow spectral bandwidth. Compared to Si and organic materials, QDs not only have high light absorption efficiency and spectral tunability due to strong quantum confinement effect but also has higher ambient stability associated with their inorganic natures.…”