Highly fluorescent nitrogen-doped carbon dots derived from Phyllanthus acidus utilized as a fluorescent probe for label-free selective detection of Fe3+ ions, live cell imaging and fluorescent ink
Source:Biosensors and Bioelectronics, Volume 99
Author(s): Raji Atchudan, Thomas Nesakumar Jebakumar Immanuel Edison, Kanikkai Raja Aseer, Suguna Perumal, Namachivayam Karthik, Yong Rok Lee
A facile, economical and one-step hydrothermal method is used to synthesize highly durable fluorescent nitrogen-doped carbon dots (FNCDs) by utilizing Phyllanthus acidus (P. acidus) and aqueous ammonia as the carbon and nitrogen sources, respectively. The synthesized FNCDs have an average size of 4.5±1nm and showed bright blue fluorescence under the irradiation of UV-light at an excitation wavelength of 365nm. It exhibits a quantum yield (QY) of 14% at an excitation wavelength of 350nm with maximum emission at 420nm. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy characterizations clearly showed the formation of FNCDs that predominantly consists of nitrogen and hydroxyl groups which can provide more adsorption sites. In addition, the above study reveals the successful bonding of nitrogen with carbon (C–N) in the FNCDs. The synthesized FNCDs with high QY can be used as efficient fluorescent probes for the detection of Fe3+. Based on the linear relationship between normalized fluorescence intensity and concentration of Fe3+ ions, the prepared FNCDs can be used for label-free sensitive and selective detection of Fe3+ ions in a wide concentration range of 2–25μM with a detection limit of 0.9μM. The present study proves that synthesized FNCDs has durable fluorescence, soluble in water very well and thus act as a promising candidate for the diverse applications such as label-free sensitive and selective detection of Fe3+, fluorescent ink and cellular imaging with good biocompatibility and low cytotoxicity.
Organometal halide perovskite solar cells have become a superstar in the photovoltaic field over the past few years. The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has rapidly been boosted to a high reported value of 22.1 %, which is even better than that of the commercialized multicrystalline silicon solar cells. However, to some extent, the low-cost and high-performance photovoltaic technique still suffers from stability and hysteresis issues. Without doubt, carbon-based materials (e.g., fullerene and its derivatives, graphene-related materials, carbon nanotubes, carbon paste) have been demonstrated to have positive effects on overcoming the above challenges, in cooperation with the optimizations in perovskite absorber layer, interface, and device structure. In this review, we will first introduce some fundamental principles of PSCs in terms of device structure and carbon-based materials. Then, the applications of various carbon-based materials in PSCs will be summarized, which are directly related to the potentiality for exploitation in device performance and stability. Finally, we will draw conclusions and highlight some promising research directions for carbon material-based PSCs.
Useful carbon: This Focus Review highlights the application of different types of carbon materials in the all-round perovskite solar cells. Compared with typical functional materials, carbon-based materials exhibit unique features for overcoming the obstacles to efficiency, stability, and hysteresis in perovskite solar cells.
Preparation of hollow microsphere@onion-like solid nanosphere MoS2 coated by a carbon shell as a stable anode for optimized lithium storage
DOI: 10.1039/C5NR05595D, Paper
Hollow microsphere@solid nanosphere MoS2 was synthesized via a facile one-step hydrothermal process, then coated with carbon shell for use as an anode material with enhanced lithium storage performance.
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