Origin of the mysterious blue fluorescence of polymer carbon dots

A quantum dot is a nanometric crystalline structure of semiconductor materials. In a quatum dot electrons are confined in a region of space, thus creating a well defined structure of energy levels that depends very much on the size and shape of the quantum dot. This structure resembles that of atoms, that is why sometimes quantum dots are also called artificial atoms. One variety is that of carbon spherical nanoparticles (less than 10 nm in size), the so-called carbon dots. A unique feature common to the vast variety of polymer carbon dots prepared from carboxylic acid and amine precursors is a mysterious emission of a bright blue fluorescence.

Interfacing transition metal dichalcogenides with carbon dots for managing photoinduced energy and charge-transfer processes

Exfoliated semiconducting MoS2 and WS2 were covalently functionalized with 1,2-dithiolane-modified carbon nanodots (CNDs). Based on electronic absorption and fluorescence emission spectroscopy, modulation of the optoelectronic properties of transition metal dichalcogenides (TMDs) by interfacing with CNDs was accomplished.

20th edition of NanoteC18

Last week the conference NanoteC18 was held at Sussex University in Brighton, where it was first held in 1998. This year’s edition was celebrating the 20th anniversary of the conference and was also dedicated to the late Prof Sir Harry Kroto NL, who received the Nobel prize for discovery of the carbon football molecule, C60.

Electrostatic Association of Ammonium-Functionalized Layered-Transition-Metal Dichalcogenides with an Anionic Porphyrin

Ammonium modified MoS2 and WS2 were prepared and characterized by complementary spectroscopic, thermal and microscopic means. The positive charges on functionalized MoS2 and WS2, owed to the presence of ammonium units, were exploited to electrostatically bring in contact an anionic porphyrin bearing a carboxylate moiety, yielding porphyrin/MoS2 and porphyrin/WS2 nanoensembles, respectively.

Theory Workshop

“Enabling Excellence” ITN has organised a two day workshop for users of the AIMPRO code in Exeter, UK, from 26th to 27th March 2018, in conjunction with Strathclyde University. The AIMPRO code uses density functional theory methods to solve the quantum mechanics that controls the distribution of nuclei and electrons in materials.

Women in Science

In celebration of the International Day of Women and Girls in Science, Ana Santidrián García, PhD student at Instituto de Carboquímica ICB-CSIC in Zaragoza, has collaborated in the exhibition “Women in Science” which is locating in the library La Pantera Rossa (San Vicente de Paúl, 28, 50001 Zaragoza).

Aqueous batteries

Aqueous batteries are an emerging candidate for low‐cost and environmentally friendly grid storage systems. Designing such batteries from inexpensive, abundant, recyclable, and nontoxic organic active materials provides a logical step toward improving both the environmental and economic impact of these systems.

Merry ChristMoS2 !

Image from partner Renishaw – this Christmas tree is molybdenum disulphide on a silicon substrate, topped off with a 633nm laser. Sample preparation by STEM_LPS in a colaboration through Enabling Excellence, image produced using inVia microscope.