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Can carbon nanoparticles change the lighting world of the future?

  • Source:net
  • Release on :2018-03-29
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A few days ago, the Chinese Academy of Sciences, Changchun Institute of Cousonna Research team to break through the carbon nano-point in the near infrared band luminous efficiency is low, the first developed a highly efficient near infrared absorption/luminescence characteristics of carbon nano-point, the realization of the carbon nano-point in vivo near-infrared fluorescence imaging.

In recent years, Cousonna led the topic group to publish articles frequently in the journal of High Impact factors. Cousonna, who took part in work in 2009, worked independently with the task force for several years, and was therefore promoted as a researcher.

Focus on carbon nano-dots

Cousonna pointed out that the luminescent carbon nano-point is a new nano-luminescent material, with small size (less than 20 nm), non-toxic, good luminous performance, biocompatibility, good light stability, a wide range of raw materials, easy to modify and other advantages, caused widespread concern at home and abroad.

Earlier, the study of luminescent inorganic semiconductor nanoparticles is very active, but the inorganic semiconductor nanoparticles generally contain heavy metal cores (lead, cadmium), have certain toxicity and harm to environment, so scientists begin to prepare new luminescent nanoparticles with some non-toxic compounds.

In the 2006, scientists at the University of Claremont in the United States produced a carbon nano-particle that emits bright light in light. Scientists have also found that luminescent carbon nanoparticles have unique advantages, such as chemical stability, flicker-free, light bleaching, non-toxic, inexpensive and excellent biocompatibility.

In 2012, the team of Cousonna, a deputy researcher at Changchun Light Machine, found that the use of carbon nanoparticles to stimulate wavelength-dependent characteristics, in conjunction with organic dyes, can be used to construct information-encrypted graphics on biological products that can be applied to information storage and information encryption.

♦ Figure 1. The schematic diagram of near infrared absorption/emission carbon nanoparticles and their luminescence mechanism was constructed by surface absorbing electron group modification.

♦ Figure 2. (a) absorption and emission spectra of carbon nano-point @pvp complexes. (b-d) Near-infrared fluorescence imaging (b) and in vivo near-infrared fluorescence imaging (d) in the blood circulation of mouse stomach (c) and after intravenous injection of carbon nanoparticles (@pvp) complexes as imaging reagents.

♦ Figure 3. Multi-photon induced luminescence of carbon nano-point stimulated by femtosecond light in near-infrared-ⅱ region. (A-b) The emission spectra and luminous intensity-excitation light power curves of the 1200 nm femtosecond light excited carbon nanoparticles, (c-d) The emission spectra and luminous intensity-excitation optical power curves of the carbon nano-dots 1400 nm femtosecond light excitation.

"These unique properties make it possible for carbon nanotubes to come into our real life." Cousonna told reporters, then their team developed a new type of fluorescent ink. "This ink can be applied to biological imaging, biological product identification, information storage, information encryption, anti-counterfeiting, lighting display, sensing, photovoltaic devices and many other fields." ”

Break through the bottleneck of technology

It is reported that the luminescence mechanism of carbon nanoparticles and the spectral regulation are the difficult points in this field. Before 2013, it was considered that the emission of carbon nanoparticles in the green light Band was originated from the surface defects of carbon nanoparticles, which were considered to be difficult to achieve laser.

To this end, the Cousonna team, through the regulation of nitrogen in carbon nanoparticles, achieved the regulation of blue and green light emitted by carbon nanoparticles, observed the amplification spontaneous emission of carbon nanoparticles in green light band, and first realized the optical pumped lasers of carbon nanoparticles in green light band.

Cousonna recalls: "In those years, we proved that the light stability of carbon nanoparticles is better than that of traditional organic laser dyes, indicating that carbon nanoparticles can be used as a kind of new laser material with low cost, green environment protection and light stability, which is expected to change the future illumination world." ”

Subsequently, Cousonna and its scientific team put forward the concept of "super carbon nanometer point" for the first time, and developed the water trigger "nanometer fluorescence bomb" based on "super carbon nanometer point", making the carbon nanometer point material become a new kind of intelligent luminescent material.

The existing carbon nano-point absorption and emission bands are mainly located in the ultraviolet-visible region, can not achieve in the near infrared region of high efficiency absorption and fluorescence quantum efficiency near-infrared luminescence, which severely limits the carbon nano-point in the biological fluorescence imaging, especially in vivo near-infrared fluorescence imaging applications.

In recent years, in response to the problem of achieving high efficiency near-infrared luminescence, the Cousonna group, by absorbing Electron group modification on the surface of red carbon nanometer point and disorderly regulation of the ordered structure of the carbon core layer, produced a new luminous band gap in the near-infrared band, and obtained a carbon nanometer point with high efficiency near infrared light excitation, Fluorescence quantum efficiency reached 10%, the highest international value.

Send a high level article

It is not difficult to find that the Cousonna research group has carried out a lot of studies in the field of luminescent carbon nano-point Energy band regulation and application. Cousonna as the first author or the author of the newsletter published 29 SCI Papers, of which the sci influence factor 10 above 6 papers, the first author of a single article sci he cited the highest 390 times, the cumulative SCI reference 1630 times. Among them, Cousonna published two articles selected ESI (Basic scientific Index database) hot and high cited papers, into the best 1 per thousand papers.

Talking about how to publish a high level of paper, Cousonna modestly said that there are not too many skills, the first is to study the direction must have value, there is application prospects, followed by the content of the study must be the core of the problem and the current major challenges. "These two points meet, the quality of published articles naturally will not be bad." ”

Currently, Cousonna has developed a research programme that allows carbon nanotubes to reach clinical applications in the field of cancer diagnosis and treatment within 10 years.

He said: "Compared with the existing nano-luminescent materials, light-emitting carbon nano-point is particularly suitable for living in vivo fluorescence imaging and cancer diagnosis and treatment of drug development." In addition, the fluorescence lifetime of carbon nano-dots is only a few nanoseconds, much lower than the existing commercial fluorescent powder, in the field of high bandwidth visible light lighting has an important application potential. ”

As a young researcher, Cousonna suggested that young people should first look at scientific research conditions and development potential. "The direction of the national scientific research personnel and the various mechanism measures are getting better, young people will be supported as long as they are willing to do it." He also hoped that the country will have more inclination to the northeast in the talent policy, and give more policy support to the young researchers in the transformation of achievements.

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