Estimation of the Number of Quantum Dots Immobilized on an Ultra-flat Au Surface

Abstract

Quantum dots (QDs) were immobilized on an ultra-flat Au surface by using amide binding between the carboxyl groups on the QDs and the amino groups of the self-assembled monolayer on the surface. The number density of the QDs estimated by atomic force microscopy (AFM) agreed with the quantity of QDs estimated by X-ray photoelectron spectroscopy and fluorescence microscopy. QDs were also immobilized on dot patterns fabricated by e-beam lithography. AFM was able to identify clusters of just a few QDs on the dot patterns, whose minimum designed size was 50 nm × 50 nm per dot.

Enhancing the ORR activity of fullerene-derived carbons by implanting Fe in assembled diamine–C60 spheres

“…This should be due to the density difference of the spheres. 35,36 N@FS and FeN@FS are packed C 60 spheres with densely intercalated N and Fe atoms. Meanwhile, N@FCS and FeN@FCS are porous carbons with Fe or N species distributed relatively loosely.…”

Bottom-Up Nanofabrication with Extreme-Ultraviolet Light: Metal–Organic Frameworks on Patterned Monolayers

“…This way, the chemical contrast of the patterns is enhanced, enabling subsequent surface modifications on exposed or unexposed areas . DNA, , nanoparticles, , quantum dots, , and materials such as surface-mounted metal–organic frameworks (SURMOFs) or perovskites , can be deposited with various levels of selectivity on surfaces endowed with a spatially resolved chemical contrast . In this work, the chemical contrast obtained from the aforementioned procedure is used to promote the growth of a SURMOF on the exposed areas (step 3), which can later act as a protective layer for the etching step and enable the transfer of the pattern to the underlying substrate (step 4).…”

Adsorption Kinetics of WS2 Quantum Dots onto a Polycrystalline Gold Surface

“…For example, in a single-electron device of an integrated circuit, a single QD or a few QDs, which function as a Coulomb island, must be fixed between two electrodes. 39 Interestingly, among all the above-mentioned QDs of 2D atomic layers, the TMDQDs possess an advantage of chalcogenide-rich edges, which can directly attach onto the 40 The QDs were then assembled on a gold surface to form a film which exhibited efficient electrocatalytic activity for hydrogen evolution reaction (HER). 40 Semiconductor QDs derived from two-dimensional (2D) materials are promising candidates for a wide range of applications such as electronic and optoelectronic devices (for example, field effect transistors (FET)), photovoltaics, lightemitting diodes, bioimaging, sensors, cancer therapy, electrocatalysis, etc.…”

“…Furthermore, coverage of the QDs immobilized on the designed areas is another key factor in assembling QD-based devices. For example, in a single-electron device of an integrated circuit, a single QD or a few QDs, which function as a Coulomb island, must be fixed between two electrodes . Interestingly, among all the above-mentioned QDs of 2D atomic layers, the TMDQDs possess an advantage of chalcogenide-rich edges, which can directly attach onto the gold electrode surface.…”