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Modulating Photothermal Properties of Carbon Dots through Nitrogen Incorporation Enables Efficient Solar Water Evaporation, ACS Applied Nano Materials, 6, 4, 2517–2526 (2023) (accepted Feb 2023, Q1/6.140) https://pubs.acs.org/doi/10.1021/acsanm.2c04893
Solar water evaporation is a way to make steam from water using sunlight. We have made new carbon dots (CDs), which are tiny carbon particles that can absorb more sunlight and heat up water faster. CDs are cheap, safe, and easy to make from urea and citric acid. The researchers changed the amount of nitrogen on the CD surface to control their light absorption. We tested the CDs in a solar water evaporator and got a high evaporation efficiency and rate. The CDs as photothermal materials in a solar water evaporator and achieved a high evaporation efficiency of up to 70% and a high evaporation rate of 1.11 kg/m2h under 1 sun illumination. The CDs also lasted for 10 days without losing their properties.
In Vitro and Silico Studies on the N-Doped Carbon Dots Potential in ACE2 Expression Modulation, ACS Omega, 8, 11, 10077–10085 (2023) (accepted Feb 2023, Q1/4.132) https://pubs.acs.org/doi/10.1021/acsomega.2c07398
ACE2 receptor is a protein that helps coronavirus enter human cells. Through this research, we have found a way to increase this protein using carbon dots (CDs), which are tiny carbon particles. CDs can interact with ACE2 receptor and make it more active. CDs are made from citric acid and urea, which are easily available and environmentally friendly materials. In a study published in the American Chemical Society journal, the researchers performed in vitro and in silico studies to evaluate the ability of CDs to modulate ACE2 receptor. This can help prevent or treat coronavirus infection. CDs are made from cheap and eco-friendly materials. This study is published in the American Chemical Society journal and can advance nanomedicine.
Revealing the Synergetic Interaction between Amino and Carbonyl Functional Groups on the Electronic and Optical Properties of Carbon Dots, Physical Chemistry Chemical Physics, 24, 27163-27172 (2022) (accepted Oct 2022, Q1/3.676) https://pubs.rsc.org/en/content/articlelanding/2022/cp/d2cp03401h
We have effectively functionalized carbon dots (CDs) with amino and carbonyl groups based on nitrogen and oxygen, showing the process by which these groups interact and how it affects the optical and electrical properties of CDs. The amino-to-carbonyl group ratio on the surface of the CDs can change their absorbance and bandgap energy, and the synergistic actions of the amino and carbonyl groups can alter the absorption peaks of the CDs into the near-infrared region and increase their absorption intensity. These discoveries might help create CDs that function better for a variety of uses, such as sensors, catalysts, and energy storage devices.
New insight into pyrrolic-N site effect towards the first NIR window absorption of pyrrolic-N-rich carbon dots, Nano Research, 16, 6001–6009 (2023) (accepted Oct 2022, Q1/IF10.269) https://link.springer.com/article/10.1007/s12274-022-5131-7
Pyrrolic-N, Pyridinic-N, and Graphitic-N are promising strategies to tune Carbon Dots' (CDs) optical characteristics within the First Near Infrared (NIR) window (650-900 nm), a relevant range for biomedical applications. Their complex structure makes it difficult to explain the role of the C-N configuration in CD properties. Integrated experimental and computational research clarified the pyrrolic-N concentration and position influence on pyrrolic-N-rich CD absorption. As-synthesized pyrrolic-N-rich CDs have strong photothermal conversion at 650 nm NIR window absorption. Pyrrolic-N concentration (1.4–11.3%) and position (edge and mid-site) were studied. After 10% pyrrolic-N, a mid-site pyrrolic-N was formed. Edge-site pyrrolic-N produces frontier orbital hybridization, lowering bandgap energy, whereas mid-site pyrrolic-strong N's charge transfer induces first NIR window absorption. Pyrrolic-N-rich CDs inherit a bowl-like topology, raising their layer thickness to 0.71 nm. This work provided information on the design and optimization of Pyrrolic-N on CDs for the first NIR window responsive materials in biomedical applications.
Solid-state Nitrogen-doped Carbon Nanoparticles with Tunable Emission Prepared by Microwave-assisted Method, RSC Adv. 11, 39917-39923 (2021) (accepted Nov 2021, Q1, IF=3.361) https://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra07290k
Tunable emissive solid-state carbon nanoparticles (CNP) has been successfully synthesized by a facile synthesis through microwave irradiation. Modulating microwave interaction with the sample that generates abrupt localized heating is a long-term challenge to tailor the CNP’s photoluminescence properties. This study systematically revealed that the sample temperature through microwave irradiation plays a crucial role in controlling the photoluminescence properties over other reaction conditions such as an irradiation time and a microwave duty cycle. When the sample temperature reached 155°C in less than three minutes, the CNP sample exhibited a green-yellowish emission with the highest Quantum Yield (QY) of 14.6%. Time-Dependent Density Functional Theory (TD-DFT) study revealed that tunable photoluminescence properties of CNP possibly ascribed to their nitrogen concentrations that dictated by the sample temperature during irradiation. This study opens a promising for well-controlled synthesizing the luminescent CNP through microwave irradiation
Synergetic Effect of the Surface Ligand and SiO2 Driven Photoluminescence Stabilization of the CH3NH3PbBr3 Perovskite Magic-Sized Clusters, Scientific Reports, 11, Article number: 22211 (2021) Nature Publishing Group (accepted Oct 2021, Q1, IF=5.133) https://www.nature.com/articles/s41598-021-01560-4
Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles. However, their metastability behavior is a critical hindrance for reliable characterizations. Here, we report the first demonstration of using an excess amount of surface ligand and SiO2 as novel passivation for synthesizing the magic-sized clusters (MSCs) by the Ligand-assisted reprecipitation method. A synergetic effect between an excessed surface ligand and SiO2 inhibits the protonation and deprotonation reaction between amine-based and acid-based ligand, leading to enhanced PL stability. The obtained CH3NH3PbBr3 PMSCs/SiO2 retain 70% of its initial emission intensity in ambient conditions for 20 days. This passivation approach opens an entirely new avenue for the reliable characterizations of CH3NH3PbBr3 PMSCs, which will significantly broaden their application for understanding and controlling nucleation and growth of semiconductor nanoparticles.
Role of Intrinsic Points Defects on the Electronic Structure of Metal-Insulator Transition h‑FeS, The Journal of Physical Chemistry Letters, 12, 44, 10777–10782 (2021) (accepted Oct 2021, Q1, IF=6.475) https://pubs.acs.org/doi/10.1021/acs.jpclett.1c02360
Hexagonal iron sulfide (h-FeS) offers huge potential in the development of metal-insulator transition devices. A stoichiometric h-FeS is hard to obtain from its natural iron deficiency. The effect of this iron deficiency on the electronic properties is still obscure. Here, we performed a charged point defect calculation in h-FeS. We found that the most favorable point defect in h-FeS can be tuned with a proper synthesis environment. The single iron vacancy could induce a midgap state with 0.05 eV energy gap, which explains the h-FeS low experimental band gap value. Furthermore, a semiconductor-to-metal transition is observed in h-FeS with higher iron vacancy concentration showing better conductivity from the excess charges. We also observe that iron vacancies will induce a magnetic moment on the antiferromagnetic h-FeS. The findings that the induced MIT behavior and magnetic moment can be tuned by defect concentration may benefit the development of spintronics devices.
Carbon-based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges, Nanomaterials 11(1), 91 (2021) (Q1, IF=4.324) https://www.mdpi.com/2079-4991/11/1/91
This paper is a comprehensive summarizes of the up-to-date progress in C-QD applications either in a bare condition or as a composite with other materials for supercapacitors. The current state of the three distinct C-QD families used for supercapacitors including carbon quantum dots, carbon dots, and graphene quantum dots is highlighted. Two main properties of C-QDs (structural and electrical properties) are presented and analyzed, with a focus on the contribution to supercapacitor performances. We also we discuss and outline the remaining major challenges and future perspectives for this growing field with the hope of stimulating further research progress.
Recent advances and rational design strategies of carbon dots towards highly efficient solar evaporation, Nanoscale, 13, 7523-75322021 (2021) (Q1, IF=6.895) https://pubs.rsc.org/en/content/articlelanding/2021/nr/d1nr00023c
Solar evaporation using photothermal materials is an environmentally friendly and feasible solution to overcome the water scarcity issue by utilizing the abundant solar energy source. Recently, carbon dots (CDs) have attracted great interest for their applications in this field. In this review, the integration of CDs into solar evaporation systems and recent advances in CD-based solar absorbers will be summarized and discussed. Before that, brief knowledge of carbon-based solar thermal evaporation, including its mechanism and strategies to improve the efficiency, is provided, followed by CDs’ synthesis and tunable properties that can be optimized for this application. Finally, the challenges and perspectives of research for CD-based solar evaporation are proposed, for example, optimizing solar absorbers by decorating hydroxyl-rich CDs in 2D or 3D structures.
On-Demand Tuning of Charge Accumulation and Carrier Mobility in Quantum Dots Solids for Electric Transport and Energy Storage Devices, NPG Asia Materials (Q1, IF=9.157)
We demonstrate on-demand control of the assembly morphology and electrical properties of highly crosslinked CQD solids through the augmentation of various assembly methods. Employment of electric-double-layer (EDL) gating on these assembly structures (i.e., an amorphous assembly, a hierarchical porous assembly, and a compact superlattice assembly) reveals their intrinsic carrier transport and accumulation characteristics.
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