Recently, Qu Songnan, a researcher at the Changchun Institute of Optics and Mechanics, Chinese Academy of Sciences, broke through the problem of low luminous efficiency of carbon nano-dots in the near-infrared region. For the first time, carbon nano-dots with high-efficiency near-infrared absorption/luminescence properties were developed, and carbon nano-dots were realized. In vivo NIR fluorescence imaging.
In recent years, Qu Songnan led the research team to frequently publish articles in high impact factor journals. Qu Songnan, who took part in the work in 2009, took the project team independently after working for a few years, and was promoted to become a researcher.
Focus on carbon nanodotsQu Songnan pointed out that luminescent carbon nano-dots are emerging nano-luminescent materials with small size (less than 20 nanometers), non-toxic, good luminescent properties, good biocompatibility, good light stability, wide raw materials and easy modification. , causing widespread concern at home and abroad.
Earlier, research on luminescent inorganic semiconductor nanoparticles was very active, but inorganic semiconductor nanoparticles generally contained heavy metal cores (lead, cadmium), which were toxic and harmful to the environment, so scientists began to prepare new ones with some non-toxic compounds. Luminescent nanoparticles.
In 2006, scientists at the University of Clemson in the United States created a carbon nanoparticle that emits bright light in the presence of light. Scientists have also discovered that luminescent carbon nanoparticles have unique advantages such as chemical stability, matt flicker, light fastness, non-toxicity, relatively inexpensive cost, and excellent biocompatibility.
In 2012, Qu Songnan, an associate researcher at the Changchun Institute of Optics and Mechanics, found that the use of carbon nanoparticles to stimulate wavelength-dependent properties, combined with organic dyes, can be used to construct information-encrypted graphics on biological products. Information storage and information encryption.
Figure 1. Schematic diagram of the construction of near-infrared absorbing/emitting carbon nanodots and their luminescence mechanisms after modification by surface electron-withdrawing groups.
Figure 2. (a) Absorption and emission spectra of the carbon nanodots @PVP complex. (bd) Near-infrared fluorescence imaging with carbon nanodots @PVP complex as imaging reagent (b) and mouse near stomach (c) and tail vein injection for live near-infrared fluorescence imaging (d).
Figure 3. Multiphoton induced luminescence of carbon nanodots excited by femtosecond light in the near-infrared-II region. (ab) 1200 nm femtosecond light excitation carbon nano-dots emission spectrum and luminescence intensity-excitation light power curve, (cd) 1400 nm femtosecond light excitation carbon nano-dots emission spectrum and luminescence intensity-excitation light power curve.
"These unique properties make it possible for carbon nano-dots to enter our real life." Qu Songnan told reporters that their team developed a new type of fluorescent ink. "This ink can be applied to many fields such as bio-imaging, bio-product identification, information storage, information encryption, anti-counterfeiting, lighting display, sensing, photovoltaic devices, etc."
Break through the technical bottleneckIt is reported that the research on the luminescence mechanism and spectral control of carbon nanoparticles is a difficult point in this field. Before 2013, internationally, the emission of carbon nanoparticles in the green light band was derived from the surface defects of carbon nanoparticles, and this source of light was considered to be difficult to achieve laser light.
To this end, Qu Songnan's team achieved the regulation of blue and green light emitted by carbon nanoparticles by regulating nitrogen in carbon nanoparticles, and observed the phenomenon of spontaneous emission of carbon nanoparticles in the green band, and realized for the first time. Optically pumped laser light with carbon nanoparticles in the green band.
Qu Songnan recalled: "In that year, we proved by comparison test 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 new type of low cost, green and light stable. Laser materials are expected to change the future of the lighting world."
Subsequently, Qu Songnan and his research team proposed the concept of “super-carbon nano-dots†for the first time in the world, and developed a water-triggered “nano-fluorescent bomb†based on “super-carbon nano-dotsâ€, making carbon nano-point materials a kind of A new type of smart luminescent material.
The existing carbon nano-dots absorption and emission bands are mainly located in the ultraviolet-visible region, and high-efficiency absorption in the near-infrared region and high-fluorescence quantum efficiency near-infrared luminescence cannot be achieved, which severely limits the carbon nano-dots in bio-fluorescence imaging, especially Application in live near-infrared fluorescence imaging.
In recent years, in order to realize the problem of high-efficiency near-infrared luminescence, Qu Songnan's research group has modified the electron-withdrawing group on the surface of red-light carbon nano-dots and disordered regulation of the ordered structure of carbon-based core layer in near-infrared. The band produces a new luminescent band gap, and carbon nano-dots with high-efficiency near-infrared emission under near-infrared light excitation are obtained, and the fluorescence quantum efficiency reaches 10%, which is the highest international value.
High level articleIt is not difficult to find that Qu Songnan's research group has carried out a lot of research in the field of luminescent carbon nano-point energy band regulation and application. As the first author or correspondent author, Qu Songnan has published 29 SCI papers, including 6 papers with SCI influence factors above 10. The first author paper has a maximum of 390 SCI quotes and 1630 cumulative SCI references. Among them, two articles published by Qu Songnan were selected into the ESI (Basic Scientific Indicators Database) hotspots and highly cited papers, and entered the list of the best one thousandth of the papers.
Talking about how to publish high-level papers, Qu Songnan said modestly that there is not much skill in this aspect. First, the research direction must have value and application prospects. Secondly, the research content must be the core problem in the field and the current The main challenge. "These two points are met, and the quality of the published articles is naturally not bad."
At present, Qu Songnan's scientific research plan is to enable carbon nano-dots to reach clinical application in the field of cancer diagnosis and treatment within 10 years.
He said: "Compared with existing nano-luminescent materials, luminescent carbon nano-dots are particularly suitable for the development of fluorescent imaging and cancer diagnosis and treatment of biological living organisms. In addition, the fluorescence lifetime of carbon nano-dots is only a few nanoseconds, far lower than the existing Commercial phosphors have important application potential in high-bandwidth visible light communication."
As a young scientific researcher, Qu Songnan suggested that young people engage in scientific research first and look at scientific research conditions and development potential. "The country's guidance to scientific research personnel and various mechanisms and measures are getting better and better. Young people will be supported if they are willing to do so and they will be in the right direction." He also hopes that the country will have more inclination to the northeast in terms of talent policy, and Young researchers give more policy support in the transformation of results.
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