Abstract
In this study, it was aimed to obtain carbon and graphene quantum dot structures from St. John's Wort (Hypericum perforatum L.) flowers, originating from the city of Hatay. Hypericum perforatum L. flower sample was subjected to carbonization at different temperatures such as 200, 225 and 250 ℃ for the desired quantum dot structure yields. It has been observed that the best radiation after carbonization is at 250 ℃. Fourier transform infrared spectrometer, X-ray diffraction and scanning electron microscopy techniques were used to determine the structural characterizations and surface morphology, respectively. The UV radiation of Hypericum perforatum L. flower-based carbon and graphene quantum structures was followed at 365 nm and the blue glow was observed very clearly. With this study, quantum and graphene dot structures based on Hypericum perforatum L. flower have been introduced to the literature for the first time. In addition, the quantum dot structures with blue radiation obtained within the scope of the study will be an alternative reference for many bioimaging and drug delivery system studies.
Highlights
Quantum Dots (QDs) are nano-sized semiconductor crystals (Kargozar & Mozafari, 2018; Zheng, Ananthanarayanan, Luo, & Chen, 2015)
When the fourier transform infrared spectrometer (FTIR) spectrum of the carbonized Hypericum perforatum L. flower is examined, it is seen that the units belonging to the functional groups in the structure are separated from the structure
XRD Results When the XRD graph of raw and carbonized Hypericum perforatum L. flower samples is examined in Figure 2, it is seen that the raw sample is both crystalline and amorphous
Summary
Quantum Dots (QDs) are nano-sized semiconductor crystals (Kargozar & Mozafari, 2018; Zheng, Ananthanarayanan, Luo, & Chen, 2015). QDs have unique optical properties due to the quantum and dimensional effect. This property makes them suitable for use as luminescent nanoprops and carriers in biological applications (Abbaspourrad, Datta, & Weitz, 2013; Peer et al, 2007). QDs are used in many fields such as drug delivery-targeting, detection of DNA and oligonucleotides, molecular histopathology, flow cytometry-based detection, disease diagnosis and biological imaging (Wagner, Knipe, Orive, & Peppas, 2019). The adjustable fluorescence and quantum size effect of CQDs make them promising materials for observing various cellular processes and biological imaging (Kargozar et al, 2020). When we look at the biomedical application areas of CQDs, drug delivery, cellular imaging, bioimaging, biosensor, bacterial imaging and targeting, gene distribution, radiotherapy, phototherapy can be given as examples (Devi, Saini, & Kim, 2019)
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