PEB working principle. (a) Schematic illustration showing 3D nanoprinting of CdSe/ZnS QDs coated with MPA using PEB. (B) Schematic illustration showing the underlying mechanism of PEB. (C) FTIR spectra of the pull-down QDs and the printed structure. attributed to him: Sciences (2022). DOI: 10.1126 / science.abo5345
A team of researchers from Tsinghua University, working with a colleague from Jilin University, has developed a new 3D nanoprinting technique that uses semiconducting quantum dots. In their paper published in the magazine Sciences, the group describes its new style and provides examples of the resulting 3D objects. Jia Ann Pan and Dmitriy Talpin of the University of Chicago provide a perspective article in the same journal issue regarding the most diverse 3D printing devices and the work the team has done in this new effort.
The use of 3D printing to make 3D objects has expanded greatly over the past decade, resulting in new products and faster ways to create illustrative objects. But, as the researchers note in this new effort, 3D printers primarily use polymer-based materials, which limits the type of products that can be manufactured. Manufacturers say they will buy 3D printers capable of printing products using optics or Electronic properties. In this new effort, researchers in China have taken a major step in this direction.
The new method involves the use of Quantum dots for semiconductors (Nano-crystals made of cadmium selenide, covered with zinc sulfide With caps made of 3-bond mercaptopropionic acid) as additives for printing materials. The points are activated using a laser. Photons from the laser are absorbed by a nanocrystal, resulting in a change in chemistry that allows the interconnection of quantum dots — a process known as two-photon absorption. In its composition, the absorption of protons was possible only in places where the intensity of light is at its highest. This allowed the creation of bonds smaller than the wavelength of light.
The researchers note that their method preserves the ferroelectric properties of quantum dotswhich means that 3D-printed products using the ink they are made of can be used in optoelectronic devices.
Researchers have demonstrated the integrity of their ideas by building a 3D printer capable of performing Two-photon absorption Then I used it to create several objects, some of which were light-emitting university badges. They also showed that it can be used with a variety of materials.
Shao-Feng Liu et al, 3D nanoprinting of semiconductor quantum dots by photoexcitation-induced chemical bonding, Sciences (2022). DOI: 10.1126 / science.abo5345
Jia-Ahn Pan et al, 3D printing of nanocrystals with light, Sciences (2022). DOI: 10.1126 / science.add8382
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