H. Li, R. Duwald, S. Pascal, S. Voci, C. Besnard, J. Bosson, L . Bouffier, J. Lacour, N. Sojic
Chem. Commun. 2020, 56, 9771–9774
A series of water-soluble helicene dyes generating intense electrochemiluminescence (ECL) signal in physiological conditions is reported. Those species were prepared using diaza [4] and [6]helicenes as structural cores modified with sulfonate groups in various positions. Such groups improve their water solubility and can induce a red-shifted emission. Efficient ECL up to the near-infrared is achieved in water, demonstrating a viable strategy for the design of new near-infrared ECL dyes for bioassays and microscopy.
L. Bouffier, N. Sojic
ACS Cent. Sci. 2020, 6, 7, 1043–1045
Developing bright and multicolor electrochemiluminescence (ECL) nanoemitters is widely pursued to achieve high sensitivity and multiplexing in bioassays and microscopy operating in physiological conditions. It is a particularly challenging task considering the specific requirements of charge injections and surface traps occurring in water during the ECL process. In this issue of ACS Central Science, Su, Peng, and co-workers rationalize the criteria of colloidal quantum dot (QD) architecture for ECL generation. In this exciting report, they present elegantly designed water-soluble QDs with an impressive ECL efficiency.
M. Niamlaem, C. Boonyuen, W. Sangthong, J. Limtrakul, D. Zigah, A. Kuhn, C. Warakulwit
In this study, we employed the oxidative dehydrogenation of C2H2 by CO2 and the C2H2 decomposition to prepare one-dimensional carbon nanomaterials (1D-CNMs). The prepared materials were carbon nanotubes (CNTs) and carbon nanofibers (CNFs) having a highly defective structure, obtained at a relatively low temperature compared to the one typically used for the synthesis of CNTs. The use of a small amount of Ni catalyst (1.25 wt%) made it possible to carry out this synthesis at low temperatures. The synthesized CNTs decorated with gold nanoparticles (AuNPs), via an electrostatic self-attachment, improved the H2O2 detection. The AuNPs were prepared with a controlled size of about 10 nm. The electrodes with CNTs synthesized via the C2H2-CO2 reaction exhibit superior sensing properties for H2O2 detection with a high sensitivity (29.67 µA/mM), an extended linear working range (5 μM to 23 mM), a low detection limit (0.138 μM) and good selectivity when compared to the ones with CNTs synthesized via C2H2 decomposition, commercial CNTs, CNFs, and other more common carbon supports such as carbon black and activated charcoal. The CNTs synthesized via the C2H2-CO2 reaction are suggested as energy-saving, cost-effective and environmentally friendly supporting material candidates for practical applications. The electrodes with CNTs show superior properties compared to other carbon supports, including a high electrochemically active surface area (EASA), low charge transfer resistance, and fast mass transfer at the electrode surface that are key factors for H2O2 detection.
A. A. Melvin, E. Lebraud, P. Garrigue, A. Kuhn
PhysChemChemPhys, 2020, 22, 22180-22184
Selected as 2020 HOT PCCP article
Separation of electric charges is the most crucial phenomenon in natural photosynthesis, and also extremely important for many artificial energy conversion systems based on semiconductors. The usual roadblock in this context is the fast recombination of electrons and holes. Here we demonstrate that the synergy of light and electric fields allows separating very efficiently electric charges over an unusually large distance in TiO2. The generated internal electric field can also be used to shuttle electrons simultaneously to the two opposite sides of a hybrid TiO2-polyaniline object. This counterintuitive behavior is based on the combination of the principles of bipolar electrochemistry and semi-conductor physics.
D. Suttipat, S. Butcha, S. Assavapanumat,T. Maihom, B. Gupta, A. Perro, N. Sojic, A. Kuhn, C. Wattanakit
ACS Appl.Mater.Interfaces, 2020, 12, 36548-36557
The development of surfaces with chiral features is a fascinating challenge for modern material science, especially when they are used for chiral separation technologies. In this contribution, the design of hierarchically structured chiral macroporous ZIF–8 electrodes is presented. They are elaborated by an electrochemical deposition–dissolution technique, based on the electrodeposition of metal through a colloidal crystal template, followed by controlled electrooxidation. This generates locally metal cations, which can interact with a chiral ligand present in solution to form Metal–Organic Frameworks (MOFs). The macroporous structure facilitates the access of the chiral recognition sites, located in the mesoporous MOF and thus helps to overcome mass transport limitations. The efficiency of the designed functional materials for chiral adsorption and separation can be fine–tuned by applying an adjustable electric potential to the electrode surfaces. This hierarchical chiral ZIF–8 structure was deposited at the walls of a microfluidic device and used as a stationary phase for enantioselective separation. The potential–controlled interaction between the stationary phase and the chiral analytes allows baseline separation of two enantiomers. This opens up interesting perspectives for using hierarchically structured chiral MOF as an efficient material for the selective adsorption and separation of chiral compounds.
- Asymmetry controlled dynamic behavior of autonomous chemiluminescent Janus microswimmers
- Absolute Chiral Recognition with Hybrid Wireless Electrochemical Actuators
- Na+ ion selectivity study of a crown ether functionalized PEDOT analog
- Photophysics, Electrochemistry and Efficient Electrochemiluminescence of Trigonal Truxene-core Dyes