Article
Chemistry, Physical
Dongke Li, Jiaming Chen, Zhaoguo Xue, Teng Sun, Junnan Han, Wanghua Chen, Etienne Talbot, Remi Demoulin, Wei Li, Jun Xu, Kunji Chen
Summary: Understanding the distribution and behavior of dopants in silicon nanocrystals is crucial for achieving controllable doping at the nanoscale and developing next-generation optoelectronic devices. This study investigates the atomic-scale distributions of phosphorus and boron dopants in silicon nanocrystal multilayers. The results show that phosphorus dopants mainly concentrate on the surfaces of silicon nanocrystals to passivate dangling bonds and provide free electrons, while boron dopants exhibit a different distribution pattern, forming a dopant-shell covering on the surfaces of silicon nanocrystals and leading to damage in the crystalline lattice.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shiho Terada, Honoka Ueda, Taisei Ono, Ken-ichi Saitow
Summary: This study developed a method for fabricating environmentally friendly quantum dots using rice husks, a byproduct of rice milling. The extracted SiO2 and Si powders from rice husks showed high yields and were used to synthesize decyl-passivated SiQDs with excellent photoluminescence properties. The colloidal solution of these SiQDs was further used to develop a SiQD LED with orange-red electroluminescence.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Review
Chemistry, Multidisciplinary
Yize Su, Chenhao Wang, Zijian Hong, Wei Sun
Summary: Silicon nanocrystals have drawn significant attention in recent decades for their unique luminescent properties, with thermal disproportionation method offering precise control over their size and structure, showing promising industrial applications. Research has shown that factors such as temperature, Si/O ratio, and surface groups play a crucial role in determining the properties of silicon nanocrystals.
FRONTIERS IN CHEMISTRY
(2021)
Review
Materials Science, Multidisciplinary
Dan Yang, Zhongjie Cui, Zhuoqi Wen, Zhiyan Piao, Haiyang He, Xian Wei, Le Wang, Shiliang Mei, Wanlu Zhang, Ruiqian Guo
Summary: This Review focuses on the application of silicon quantum dots (Si QDs) in the field of biomedicine, discussing their rational design of fabrication methods and modifications. It also summarizes the current research hotspots of Si QD applications in disease diagnosis/therapeutics, bioanalyte sensing, and tissue engineering. The aim is to provide material researchers with deep insights into the design of novel Si QDs for biomedical applications.
ACS MATERIALS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
M. M. Raj Sha, K. P. M. Rishad, V. Pradeep Kumar, V. P. N. Nampoori, A. Mujeeb
Summary: Si-Au nanocomposites were synthesized by laser ablation and their optical and structural characteristics were studied. Si-Au nanocomposites synthesized in the presence of trisodium citrate showed exceptional nonlinear absorption and optical limiting activity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Review
Chemistry, Multidisciplinary
Beatrice Bartolomei, Jacopo Dosso, Maurizio Prato
Summary: Carbon dots are currently a hot topic in nanomaterial research, but their preparation methods have faced challenges such as high temperatures, long reaction times, and toxic solvents. Innovative chemistry fields like mechanochemistry, flow chemistry, and laser synthesis could offer potential solutions to these issues. Additionally, machine learning could be utilized to expand the properties and applications of carbon dots.
TRENDS IN CHEMISTRY
(2021)
Review
Materials Science, Multidisciplinary
Dan Yang, Zhongjie Cui, Zhuoqi Wen, Zhiyan Piao, Haiyang He, Xian Wei, Le Wang, Shiliang Mei, Wanlu Zhang, Ruiqian Guo
Summary: Silicon nanomaterials, especially silicon quantum dots (Si QDs), have emerged as promising biomedical materials due to their natural reserves, biocompatibility, and optical properties. This review summarizes the recent advances in the rational design and modification methods of Si QDs, providing insights into the exploration of modified Si QDs for biomedical applications. The review also highlights the current research hotspots of Si QDs in areas such as disease diagnosis/therapeutics, bioanalyte sensing, and tissue engineering.
ACS MATERIALS LETTERS
(2023)
Article
Optics
Ronja Koethemann, Christian Golla, Hong Qu, Cedrik Meier
Summary: This study investigates the influence of gold nanoantennas on the photoluminescence signal of silicon nanocrystals. By integrating gold nanoantennas into a layered system containing silicon nanocrystals, the photoluminescence signal can be manipulated in terms of attenuation or enhancement. Additionally, the impact of grating coupling and the number of antennas per antenna array on the amplification of the photoluminescence signal is examined.
Article
Chemistry, Physical
Tsumugi Miyashita, Paulina Jaimes, Tianquan Lian, Ming Lee Tang, Zihao Xu
Summary: The study investigates the impact of ligands on photon upconversion and finds that long-chain ligands decrease the efficiency of energy transfer, while short-chain ligands enable direct energy transfer and enhance the upconversion quantum yield.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Dezhang Chen, Pui Kei Ko, C-H Angus Li, Bosen Zou, Pai Geng, Liang Guo, Jonathan E. Halpert
Summary: In this study, a ligand-exchange method using amino acids was developed to reduce long chain ligands on CsPbI3 quantum dots (QDs) and improve the efficiency and stability of resulting LEDs. The performance of the LEDs was assessed with different amino acids, and it was found that cysteine-passivated QDs showed the best performance with a dual-passivation effect.
ACS ENERGY LETTERS
(2023)
Article
Physics, Applied
Yupengxue Ma, Ruoyu Wang, Xiaoru Qin, Qing Zhang, Xiaoxia Zhong
Summary: Environmentally friendly and fast synthesis of silicon quantum dots (SiQDs) is achieved with the help of plasma. The optimization of precursor concentration, reaction time, and other parameters can effectively improve the quantum yield (QY) of SiQDs. By utilizing the amidation and condensation reactions of DAMO and citric acid, this study successfully increases the QY of SiQDs from 4.23% to 23.9%, providing a promising approach for further improvement.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Natalia Bushlanova, Vladimir Baturin, Sergey Lepeshkin, Yurii Uspenskii
Summary: Silicon nanocrystals have significant potential in various applications, with their structural morphology and photo-physical characteristics being sensitive to hydrogenation degree. The clusters of hydrogen-passivated silicon can undergo different structural types, with a key importance on removing dangling bonds and passivating surface broken bonds.
Article
Chemistry, Physical
Shuaibing Wang, Yu Li, Jie Chen, Ouyang Lin, Wentao Niu, Chunhe Yang, Aiwei Tang
Summary: Quantum dot light-emitting diodes (QLEDs) have rapidly developed as a competitive alternative to cadmium-based QLEDs, utilizing indium phosphide (InP)-based quantum dots (QDs) without heavy metals. This review summarizes the properties of InP-based QDs, carrier dynamics, and the development of red, green, and blue primary color InP-based QLEDs from their first report in 2011 to the current state of the art. The effects of QD structure and device structure on the performance of InP-based QLEDs are also discussed.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Le Han, Yide Han, Junbiao Wu, Xia Zhang, Zhuopeng Wang, Yan Xu
Summary: The study presents a method to encapsulate CsPbX3 nanocrystals in a titanium silicate molecular sieve, forming stable nanocomposites with potential applications in temperature sensing and luminescent stability. The nanocomposites exhibit dual-mode temperature-readout properties and excellent stability in various polar solvents.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Physical
Yuping Xu, Yunzi Xin, Takashi Shirai
Summary: Visible photoluminescent silicon nanocrystals capped with hydrophobic surface were successfully synthesized using a novel one-step bottom-up approach. The synthesized Si NCs have an average size of 3.4 nm and exhibit visible photoluminescence with a high absolute quantum yield of 17%, possibly due to the efficient hydrophobic surface capping on the Si NCs.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Polymer Science
Ridhwan Razali, Zhi Ling Goh, Nur Khuzaimah Farhana, Ramesh Kasi, Ramesh Subramaniam
Summary: By incorporating transition metal oxide nanofiller, the performance of dye-sensitized solar cells can be improved. The shape of the nanofiller has an impact on the composite gel terpolymer electrolyte, with Co3O4 showing better performance due to its strong Lewis acidity.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
M. Nujud Badawi, Mamta Bhatia, S. Ramesh, K. Ramesh, Mujeeb Khan, Syed Farooq Adil
Summary: Pure natural cotton is a flexible and foldable material with a high response rate, making it suitable for low-cost electrode development for electrochemical supercapacitors. A composite of cotton with different ratios of a conducting polymer, PEDOT:PSS, was created using polymerization. A hydrogel electrolyte was developed using natural polymers. The fabricated supercapacitor was analyzed using various characterization techniques. The composite cotton-based supercapacitor showed a specific capacitance of 296 F/g at 100 mA g(-1) and demonstrated its performance by operating a LED.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Polymer Science
Nujud M. M. Badawi, Mamta Bhatia, S. Ramesh, K. Ramesh, Mufsir Kuniyil, Mohammed Rafi Shaik, Mujeeb Khan, Baji Shaik, Syed E. F. Adil
Summary: A smart self-healing hydrogel electrolyte based on alginate/PEDOT:PSS(A/P:P) with H2SO4 as a polymeric initiator and a source of ions was prepared, which exhibited high ionic conductivity and self-healing ability. The composite hydrogel showed a significant improvement in ionic conductivity and could repair itself within 10 minutes of cutting.
Article
Chemistry, Applied
Jian Wang, Yachuan Shao, Fei Yuan, Huilan Sun, Di Zhang, Zhaojin Li, S. Ramesh, H. J. Woo, Bo Wang
Summary: In this study, a Mo-W-MOF with core-shell structure was formed and transformed into a multileveled MoWSe2/WO3/C anode with a unique petal-like curled nanosheet structure. The electrode demonstrated excellent metallic properties and exhibited high capacity and energy density in sodium-ion batteries/capacitors, providing a reference for the development of transition metal chalcogenides anodes.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Green & Sustainable Science & Technology
Nujud Mohammad Badawi, Khalid Mujasam Batoo, S. Ramesh, K. Ramesh, Ahamad Imran
Summary: In this study, the effects of single-wall carbon nanotubes (SWCNT)/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) loading on the transparency and conductivity of pure cotton were investigated. The cotton fabric exhibited a low surface resistance and retained its maximum resistance even after three months. The results from various characterization techniques confirmed the good dispersion of SWCNTs/PEDOT: PSS in the cotton sample. Furthermore, the composite cotton/hydrogel polymer/composite cotton showed high specific capacitance and thermal stability.
Article
Polymer Science
Sachin Sharma Ashok Kumar, I. A. Wonnie Ma, Gerard Ong, K. Ramesh, S. Ramesh
Summary: Researchers developed a series of coatings containing acrylic and epoxy resins to investigate their corrosion protection performance on mild steel substrates. 1 wt% polydimethylsiloxane (PDMS) solution was added as a modifier to enhance the corrosion protection and hydrophobicity of the coatings. The chemical structures and thermal stability of the coatings were evaluated using FTIR and TGA analysis, while their transparency and surface wettability were investigated using UV-Vis spectroscopy and water contact angle instrument. The corrosion protection performance was evaluated using EIS, and the T5 coating sample exhibited the best results.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Electrochemistry
Ong Gerard, Arshid Numan, Mohammad Khalid, S. Ramesh, K. Ramesh
Summary: A binder-free nickel-copper phosphate battery-type electrode was successfully fabricated using a microwave-assisted hydrothermal technique. The electrode showed high specific capacity and excellent electrochemical properties, making it a promising choice for battery-type electrodes in electrochemical energy storage applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Fathiah Kamarulazam, Shahid Bashir, S. Ramesh, K. Ramesh
Summary: This review discusses the development of two-dimensional MXene materials for efficient energy applications. Researchers have shown great interest in MXenes due to their outstanding characteristics, such as rich hydrophilic surface functional groups, high ionic conductivity, and hydrophilicity. The potential of MXenes as electrolytes in electrochemical energy systems, as well as other devices such as electrochromic devices and iontronics, is emphasized. The challenges and significance of MXenes are briefly touched upon, and the latest developments and successes of MXene-based electrolytes are presented.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Applied
Iling Aema Wonnie Ma, Gerard Ong, Ammar Shafaamri, Julie Nabilah Jamalludin, Nina Nazirah Ishun, Ramesh Kasi, Ramesh Subramaniam
Summary: This study aims to fabricate an acrylic-based polymeric composite coating with a hydrophobic surface by incorporating 3 Wt.% SiO2 nanoparticles, natural oil polyol (NOP), and polydimethylsiloxane. The structural properties of the coating were analyzed using various tests. The incorporation of SiO2 nanoparticles enhanced the surface roughness and hydrophobic properties, resulting in improved corrosion protection.
PIGMENT & RESIN TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Sachin Sharma Ashok Kumar, M. Nujud Badawi, Khalid Mujasam Batoo, I. A. Wonnie Ma, K. Ramesh, S. Ramesh, Mohd Asif Shah
Summary: Acrylic-epoxy-based nanocomposite coatings loaded with graphene oxide (GO) nanoparticles at different concentrations were successfully prepared. The inclusion of GO nanoparticles increased thermal stability and reduced transmittance. The incorporation of GO and PDMS enhanced surface hydrophobicity and adhesion behavior, while FESEM micrographs confirmed excellent dispersibility. The unique features of graphene and its derivatives make them promising nanofillers/inhibitors for corrosion protection applications.
SCIENTIFIC REPORTS
(2023)
Article
Polymer Science
Sachin Sharma Ashok Kumar, Nujud Badawi Mohammed, Osamah Alduhaish, Kasi Ramesh, Subramaniam Ramesh, Mujeeb Khan, Baji Shaik, Syed. F. Adil
Summary: The researchers fabricated graphene/TiO2-based nanocomposite coating systems by adding TiO2 nanoparticles into the acrylic-epoxy polymeric matrix. The properties of the coatings were investigated using various testing methods. The results showed that the TiO2 nanoparticles were successfully decorated on the graphene surface and exhibited good dispersibility and uniform distribution within the polymeric matrix.
Article
Chemistry, Physical
Fara M. Aris, M. Pershaanaa, Surender Gunalan, Shahid Bashir, Fatin Saiha Omar, Norshahirah M. Saidi, K. Ramesh, S. Ramesh
Summary: Supercapattery is an emerging alternative energy storage technology, and cobalt phosphate (Co3(PO4)2) is a promising electrode material due to its abundance, low cost, valence states variation, and good faradaic property. To improve its electrochemical performance, Co3(PO4)2 was synthesized via sonochemical method, calcined at different temperatures, and coated with cobalt hydroxide (Co(OH)2) layer. The optimized sample showed fascinating electrochemical performance and outstanding cyclic stability over 15,000 charge/discharge cycles.
Article
Materials Science, Multidisciplinary
Sachin Sharma Ashok Kumar, I. A. Wonnie Ma, K. Ramesh, S. Ramesh
Summary: Corrosion-induced damages have caused malfunctions and failures in metallic structures, resulting in economic loss. Graphene, as a wonder material, is widely used in corrosion protection coatings due to its excellent chemical stability, superior mechanical properties, and high corrosion resistance. This study demonstrates the remarkable features of graphene-based nanofillers in improving the barrier performance of acrylic-epoxy based polymer coatings.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
M. Nujud Badawi, Namrata Agrawal, Syed Farooq Adil, S. Ramesh, K. Ramesh, Shahid Bashir
Summary: Supercapacitors made from fiber materials have high flexibility, light weight, and high energy density, making them important for electrochemical energy storage. They are used in electronic systems for information sensing, computation, communication, and electronic textiles due to their higher power density than standard capacitors and batteries.
NEW CARBON MATERIALS
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
H. Muthu, K. Ramesh, S. Ramesh, S. Bashir
Summary: This study aimed to provide reference data and indicators of radionuclide fallout in Malaysia by measuring the activity concentration of cesium-137 in agricultural soil. Using a High Purity Germanium gamma-ray spectrometer, the AC of Cs-137 was determined to assess the radiological hazards to the public. The results showed that the analyzed values were below the recommended thresholds by international committees and did not pose any radiological hazards to the general population.
INTERNATIONAL JOURNAL OF RADIATION RESEARCH
(2023)
