functionalized custom quantum dots

> scientific Committee > synergy


Attonuclei is exploring the power and potential of organizing and manipulating matter to engineer new integrated and emergent systems and devices, by starting bottom at the sub-nanoscale level. To support the R&D, Attonuclei encompasses multiple core facilities which include highly-secured both wet and dry laboratories, equipment in the form of vibronique spectrometers, far and near field microscopes, electron microscopes, X-Ray quantitative and qualitative analyzers, ppt level mass spectrometers, particle analyzers, sub-micron resolution 3D plotters and etc..

Each of the following core facilities will afford friendly work space for numerous research projects led by Attonuclei.

Attonuclei use most powerful instruments in the market on the date to analyze a range of subnano (including matters) and nano scale products for materials identification and characterization at nano volume scale. These include quantum dots, nanorods, nanoparticles, nanotubes and the combination of many components that make up a molecular scale structure.

At the micro scale, these include structures built up from nano building blocks, lithography (e.g. laser etching technologies), self assembled nano structured materials such as nanoporous materials, colloidal nanostructures and multiphase dispersions.

At the stage of the manufacture of these products, it is important to be able to define specifications and then demonstrate that product is meeting these specifications. This process can involve imaging of the particles, surfaces and 3D structures and also measuring parameters such as particle size distributions or surface area and assessing associated product variability.

Quantum dots are a new form of matter that can be considered as « artificial atoms” because free electrons in them start to behave in a way similar to bound electrons by atoms in that they can only occupy certain permitted energy states. They have linear discrete absorption spectra (like atoms) and photoluminescence that is tunable (by changing the dot size) over a wide range, from far infrared to deep ultraviolet. They can be moved around for different purposes: to form quantum dots « artificial atoms » to form three-dimensional « meta-crystals » that form new materials having tailored lattice constants, tailored crystal symmetry and tailored band structure to act as dopants in other materials to be joined with a larger molecule to form a super molecule.

In this way, instead of 109 elements we have at our disposal, in principle, an unlimited number of atomic « elements. »

For exemple, for the display technology the usefulness of quantum dots comes from their peak emission frequency’s extreme sensitivity to both the dot’s size and composition, which can be controlled using “Attonuclei’s Sublimation Technologies” proprietary engineering techniques.

With this method, it became possible to produce uniform quantum dots at the atomic level, making strain-free high-quality synthetic atoms a reality. By selection of the growth requirements, it is possible to produce diverse functionality of quantum dots, in addition to facilitating production of variegated quantum dots. In fact, we target new kernels with specific properties, then refine the synthetic routes for larger-scale custom production.

Our laboratory uses “Attonuclei Sublimation Technologies” to fabricate and functionalize different unique quantum dots (as seen in photo in the page of CUSTOM DESIGN), while aiming to realize new quantum optics functions through integration with photonic crystals and the like. Furthermore, we have developed refined microscopic (near field) and spectroscopic techniques (3D time resolved PL) for analysis of electronic structure and light wave propagation of the quantum dots.

Research Area Summary

We have been researching the use of quantum dots in different applications, some of our works are illustrated by those examples;

from the electronics

Our research is on improving the efficiency of solar cells.  Theoretically, the best way to increase the efficiency is to increase the number of excitons created by photons.  Quantum dots, in the right matrix, appear to be able to do just that. Our research group wants to create composites of quantum dots and conducting matrix by synthesizing the dots in-situ in the matrix.  This method should remove the need for insulating materials used to keep the quantum dots from clumping which have the unfortunate side effect of also limiting the helpful properties of the quantum dots.

to the biotechnology

At the same time, quantum dots have emerged as a powerful tool in fluorescent detection. The quantum dots are bright, photostable, and have very flexible excitation properties. To build materials that are detectable in complex environments, we have made infrared quantum dots with improved tissue penetration of the emitted light, allowing us to detect structures up to a few mm deep in living tissues.