Abstract: The present invention discloses a technique of preparation of composite nanodots, and their use in the field of photoacoustic imaging, wherein, the main components of the composition are carbon nanodots, and supporting component is methylene blue, and the composition has favourable biocompatibility characteristics with the average grain size of 150-300 nanometers, and the average zeta potential of ?15 to 5 millivolts. The above said techniques for preparation of composite nanodots are safe, quick and simple, low cost, and easy to perform for industrialized production. Composite carbon nanodots have good biocompatibility and safety, high photoacoustic imaging sensitivity, and it is promising in gaining wider use in the fields of biomedical imaging, targeting diagnosis and therapy, drug screening and optimization, and in vivo labelling and tracing, and has potential value in personalized medicine.

Abstract: The present invention discloses a preparation technique of composite nanodots based on carbon nanodots, and their use in the field of fluorescent imaging, wherein, the main components of the composition are carbon nanodots, which are material with superior biocompatibility characteristics, and supporting component is methylene blue, and particle diameter range is 100-500 nanometers, and the zeta potential is ?35 to 10 millivolts. The above said techniques for preparation of composite nanodots are safe, quick and simple, low cost, and easy to perform for industrialized production. Composite carbon nanodots have good biocompatibility and safety, high fluorescence imaging sensitivity, and they are promising in gaining wider use in the fields of biomedical imaging, targeting diagnosis and therapy, drug screening and optimization, and in vivo labelling and tracing, and have potential value in personalized medicine.

Abstract: A polybutylacrylate-based nanocomposite photoacoustic imaging agent includes a biomedical material such as polybutylacrylate used as a main component and methylene blue or indocyanine green used as an entrapped component with particle diameters of 525.1 nm and 272.0 nm and electric potentials of ?4.52 mV and ?5.98 mV respectively. The preparation method of the polybutylacrylate-based nanocomposite photoacoustic imaging agent with the features of moderate eco-friendliness, low power consumption, and free of three industrial wastes, radiation, and noise pollution may be used for industrial production.