13 research outputs found
Biocompatible Single-Crystal Selenium Nanobelt Based Nanodevice as a Temperature-Tunable Photosensor
Selenium materials are widely used in photoelectrical devices, owing to their unique semiconductive properties. Single-crystal selenium nanobelts with large specific surface area, fine photoconductivity, and biocompatibility provide potential applications in biomedical nanodevices, such as implantable artificial retina and rapid photon detector/stimulator for optogenetics. Here, we present a selenium nanobelt based nanodevice, which is fabricated with single Se nanobelt. This device shows a rapid photo response, different sensitivities to visible light of variable wave length, and temperature-tunable property. The biocompatibility of the Se nanobelts was proved by MTT test using two cell lines. Our investigation introduced a photosensor that will be important for multiple potential applications in human visual system, photocells in energy or MEMS, and temperature-tunable photoelectrical device for optogenetics research
Periodically twinned nanotowers and nanodendrites of mercury selenide synthesized via a solution-liquid-solid route
Two types of mercury selenide nanostructures, nanotowers and nanoscale dendrites, have been created with good control and high yield by a solution-liquid-solid process. Alternating twinned structures have been achieved in both the nanotowers and the nanodendrites, which originate from self-oscillations of local reaction variables sustained by the competition between the rates of supply and deposition of HgSe in the liquid mercury droplets
Removal of Organic Dyes by Nanostructure ZnO-Bamboo Charcoal Composites with Photocatalysis Function
Composites of nanostructure zinc oxide (nano-ZnO) and bamboo charcoal (BC) were successfully prepared via impregnationprecipitation method. The products were characterized by XRD, SEM, and EDS. Rhodamine B (RhB) and acid fuchsin (AF) were selected as the organic dyes of photocatalysis degradation under the irradiation of ultraviolet light (UV). The influence of particle size of BC, irradiation time, pH value of the solution, and additive amount of H 2 O 2 on removal of the dyes has been studied. The results show that smaller particle size of BC in the composites has a better removal effect. The composites possess the highest removal capacity for RhB and AF under the conditions of pH = 2 and pH = 5.4, respectively. The optimum additive amount of H 2 O 2 for 5 mL RhB and AF was 0.050 mL and 0.1 mL, with a removal rate of 93% and 99%, respectively
Removal of Organic Dyes by Nanostructure ZnO-Bamboo Charcoal Composites with Photocatalysis Function
Composites of nanostructure zinc oxide (nano-ZnO) and bamboo charcoal (BC) were successfully prepared via impregnation-precipitation method. The products were characterized by XRD, SEM, and EDS. Rhodamine B (RhB) and acid fuchsin (AF) were selected as the organic dyes of photocatalysis degradation under the irradiation of ultraviolet light (UV). The influence of particle size of BC, irradiation time, pH value of the solution, and additive amount of H2O2 on removal of the dyes has been studied. The results show that smaller particle size of BC in the composites has a better removal effect. The composites possess the highest removal capacity for RhB and AF under the conditions of pH = 2 and pH = 5.4, respectively. The optimum additive amount of H2O2 for 5âmL RhB and AF was 0.050âmL and 0.1âmL, with a removal rate of 93% and 99%, respectively
Hybrid Structures of Sisal Fiber Derived Interconnected Carbon Nanosheets/MoS2/Polyaniline as Advanced Electrode Materials in Lithium-Ion Batteries
In this work, we designed and successfully synthesized an interconnected carbon nanosheet/MoS2/polyaniline hybrid (ICN/MoS2/PANI) by combining the hydrothermal method and in situ chemical oxidative polymerization. The as-synthesized ICNs/MoS2/PANI hybrid showed a âcaramel treat-likeâ architecture in which the sisal fiber derived ICNs were used as hosts to grow âfollower-likeâ MoS2 nanostructures, and the PANI film was controllably grown on the surface of ICNs and MoS2. As a LIBs anode material, the ICN/MoS2/PANI electrode possesses excellent cycling performance, superior rate capability, and high reversible capacity. The reversible capacity retains 583 mA h/g after 400 cycles at a high current density of 2 A/g. The standout electrochemical performance of the ICN/MoS2/PANI electrode can be attributed to the synergistic effects of ICNs, MoS2 nanostructures, and PANI. The ICN framework can buffer the volume change of MoS2, facilitate electron transfer, and supply more lithium inset sites. The MoS2 nanostructures provide superior rate capability and reversible capacity, and the PANI coating can further buffer the volume change and facilitate electron transfer
Improvement of Lithium Storage Performance of Silica Anode by Using Ketjen Black as Functional Conductive Agent
In this paper, SiO2 aerogels were prepared by a solâgel method. Using Ketjen Black (KB), Super P (SP) and Acetylene Black (AB) as a conductive agent, respectively, the effects of the structure and morphology of the three conductive agents on the electrochemical performance of SiO2 gel anode were systematically investigated and compared. The results show that KB provides far better cycling and rate performance than SP and AB for SiO2 anode electrodes, with a reversible specific capacity of 351.4 mA h gâ1 at 0.2 A gâ1 after 200 cycles and a stable 311.7 mA h gâ1 at 1.0 A gâ1 after 500 cycles. The enhanced mechanism of the lithium storage performance of SiO2-KB anode was also proposed
Metal-organic frameworks derived anatase/rutile heterostructures with enhanced reaction kinetics for lithium and sodium storage
Biocompatible Mn(II)-Enhanced NâS-Codoped Carbon Dots: A Versatile Fluorescence Sensor for Sensitive Hg<sup>2+</sup> Detection in Coastal Seawater and Living Cells
Despite the promising potential of
carbon dots (CDs) as a photoluminescent
nanomaterial in advancing spectral analysis techniques for the detection
of various harmful heavy metal ions such as Hg2+, Cu2+, Cd2+, and Pb2+, the fundamental challenge
of effectively eliminating the interference of transition metal ions
in multi-ion systems persists. In this study, we present straightforward,
efficient, and versatile manganese(II)-enhanced nitrogen and sulfur
codoped carbon dots (Mn(II)-N,SCDs) specifically designed for the
highly selective and sensitive detection of Hg2+ ions.
Mn(II)-N,SCDs exhibited uniform particle size (âŒ2.0 nm) and
demonstrated excellent fluorescence performance, characterized by
high fluorescence intensity and quantum yield (QY = 48.71%). The incorporation
of Mn2+ not only enhances the fluorescence characteristics
but also serves to effectively block the surplus transition metal
ion binding sites on the surface of carbon dots, thereby leading to
a heightened selective response to Hg2+. Furthermore, the
synthesized Mn(II)-N,SCDs also exhibited low cytotoxicity and efficient
cellular uptake, enabling fluorescence imaging of living cells. Importantly,
the developed fluorescence sensor exhibited a highly specific response
to Hg2+ ions even in the presence of other metal ions in
phosphate-buffered solution (PBS), with a low detection limit of 0.29
nM (S/N = 3). The efficacy of the probe was successfully demonstrated
through the determination of Hg2+ in live cells and natural
coastal water samples
Constructing Abundant Oxygen-Containing Functional Groups in Hard Carbon Derived from Anthracite for High-Performance Sodium-Ion Batteries
Hard carbon is regarded as one of the greatest potential anode materials for sodium-ion batteries (SIBs) because of its affordable price and large layer spacing. However, its poor initial coulombic efficiency (ICE) and low specific capacity severely restrict its practical commercialization in SIBs. In this work, we successfully constructed abundant oxygen-containing functional groups in hard carbon by using pre-oxidation anthracite as the precursor combined with controlling the carbonization temperature. The oxygen-containing functional groups in hard carbon can increase the reversible Na+ adsorption in the slope region, and the closed micropores can be conducive to Na+ storage in the low-voltage platform region. As a result, the optimal sample exhibits a high initial reversible sodium storage capacity of 304 mAh gâ1 at 0.03 A gâ1, with an ICE of 67.29% and high capacitance retention of 95.17% after 100 cycles. This synergistic strategy can provide ideas for the design of high-performance SIB anode materials with the intent to regulate the oxygen content in the precursor