Article
Optics
Dongke Li, Jiaming Chen, Teng Sun, Yangyi Zhang, Jun Xu, Wei Li, Kunji Chen
Summary: Phosphorus/boron co-doping in Si quantum dots/SiO2 multilayers enhances subband light emission, with increasing B co-doping ratio resulting in improved emission intensity nearly two orders of magnitude stronger than solely P-doped samples. This enhancement is attributed to B dopants passivating surface dangling bonds, leading to suppressed phosphorus-related deep level emission and appearance of emission centered around 1400 nm in high B co-doping ratios.
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
Alfredo Morales-Sanchez, Maria Antonia Cardona-Castro, Liliana Licea-Jimenez, Liliana Palacios-Huerta, Antonio Coyopol, Sergio Alfonso Perez-Garcia, Jaime Alvarez-Quintana, Mario Moreno
Summary: In this work, a correlation between the composition and the microstructural and optical properties of luminescent porous silicon (PSi) films is shown. The use of nitric acid enhances the photoluminescence intensity of PSi samples. Changing the concentration ratio of the electrolyte solution can modify the size of silicon nanocrystals and the emission wavelength. These findings are important for understanding the properties and applications of PSi.
Article
Optics
Mengyang Hao, Shun Cheng, Ye He, Weidong Xiang, Nan Ding, Wen Xu, Chong-Geng Ma, Xiaojuan Liang
Summary: A Dy3+-CPCB NCsG material is synthesized in borosilicate glass, which greatly improves the photoluminescence quantum yield and stability of Si photodetectors through the doping of Dy3+.
LASER & PHOTONICS REVIEWS
(2023)
Article
Spectroscopy
R. F. Silva, C. Luz-Lima, P. T. C. Freire, F. E. A. Melo, G. S. Pinheiro
Summary: The properties of C7H12N2O5 crystal were studied under high-temperature conditions using vibrational spectroscopy and thermal analysis techniques. The results showed that the material undergoes a reversible order-disorder phase transition at 373 K, where changes in the vibrational spectra, especially in the vibrational modes of the hydrogen bonds, were observed. The phase transition of the α-Asp-Ala crystal (around 373 K) involves changes in hydrogen bonds, possibly the rupture of at least one of them, and a change in the molecular conformation in the unit cell.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Inorganic & Nuclear
Marcin Runowski, Teng Zheng, Przemyslaw Wozny, Peng Du
Summary: A breakthrough in optical pressure sensing has been made with the development of an ultra-sensitive NIR pressure sensor using YVO4:Yb3+-Er3+ material, allowing high-pressure measurements without spectral overlapping/interferences of various luminescent organic and inorganic materials.
DALTON TRANSACTIONS
(2021)
Article
Physics, Applied
Ya-Chao Li, Chao Ge, Hai-Ying Song, Peng Wang, Xiao-Ran Ma, Shi-Bing Liu
Summary: The lattice expansion in hybrid halide perovskite has a direct impact on its photoelectric properties and the stability of perovskite-based optoelectronic devices. This study investigates the lattice expansion in bulk hybrid perovskite MAPbI(3) under continuous illumination and direct heating using ultrafast time-resolved transient and steady-state reflectivity technology. The results suggest that continuous light illumination can induce lattice expansion in the presence of natural temperature changes, which is consistent with the effect of heat-induced expansion.
JOURNAL OF APPLIED PHYSICS
(2022)
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
Nanoscience & Nanotechnology
Haorui Dong, Haiyan Zhao, Tongtong Xuan, Wenhao Bai, Tianyu Lin, Yixin Cai, Rong-Jun Xie
Summary: Lead halide perovskite nanocrystals with a perovskite/linear low-density polyethylene (perovskite/LLDPE) core/shell structure were successfully synthesized to achieve high photoluminescence quantum yield (PLQY) and high stability. The improved photoluminescence properties were attributed to the enhanced pressure effect and interaction between ligand and perovskite crystals. The resulting nanocrystals showed high stability under ambient conditions and against UV light, and were used to fabricate white-emitting Mini-LEDs with a super wide color gamut.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhengqing Liu, Kunkun Nie, Xiaoyan Qu, Xinghua Li, Binjie Li, Yanling Yuan, Shaokun Chong, Pei Liu, Yunguo Li, Zongyou Yin, Wei Huang
Summary: Phase engineering of nanomaterials provides a promising way to explore the phase-dependent physicochemical properties and various applications of nanomaterials. In this study, a general scalable colloidal synthesis method was reported for the preparation of nanosized 1T'-TMD monolayers with high phase purity. The growth mechanism of 1T'-TMD nano-monolayers was uncovered through experiments and calculations. Additionally, the application of 1T'-TMD nano-monolayers for electrocatalytic hydrogen production was demonstrated.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
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
Chemistry, Inorganic & Nuclear
Hiroko Tokoro, Asuka Namai, Shin-ichi Ohkoshi
Summary: Iron oxide magnets, known as ferrite magnets, are compounds of iron and oxygen that have various applications due to their chemical stability and low cost. Epsilon-iron oxide, a polymorph with a large coercive field, retains its ferromagnetic ordering even when nano-sized, making it a promising candidate for high-density magnetic recording media in the era of big data. Recent advancements in magnetic films composed of metal-substituted epsilon-iron oxide aim to pave the way for the next generation of magnetic media.
DALTON TRANSACTIONS
(2021)
Article
Multidisciplinary Sciences
Haojie Xu, Wuqian Guo, Yu Ma, Yi Liu, Xinxin Hu, Lina Hua, Shiguo Han, Xitao Liu, Junhua Luo, Zhihua Sun
Summary: Metal-free antiferroelectric materials have great potential for energy storage applications due to their wearability, environmental friendliness, and structure tunability. This study successfully synthesized binary CMBr(x)l(1-x) and CMBrxCl1-x solid solution single crystals, with a molecule-level modification to enhance the Curie temperature. Among the known molecular antiferroelectrics, the binary CM-chloride salt exhibits the highest antiferroelectric-to-paraelectric Curie temperature and provides a large electric polarization, enabling notable energy storage behaviors. This work introduces an effective solid-solution methodology for the targeted design of new metal-free antiferroelectric candidates towards biocompatible energy storage devices.
NATURE COMMUNICATIONS
(2022)
Article
Spectroscopy
A. N. C. Ferreira, W. C. Ferreira, A. V. Duarte, C. C. Santos, P. T. C. Freire, C. Luz-Lima, J. V. B. Moura
Summary: In this study, the temperature-dependent behavior of monoclinic silver dimolybdate (m-Ag2Mo2O7) microrods was investigated using in situ Raman scattering. The m-Ag2Mo2O7 microrods were synthesized by conventional hydrothermal method at 423 K for 24 h. The structural phase transition from monoclinic to triclinic structure was observed at 698 K-723 K, accompanied by the melting process at 773 K. No morphological changes were observed during the structural phase transition at 723 K, while the growth of nanowires was observed on the Ag2Mo2O7 microrods in the triclinic structure at 773 K.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Chengjian Zhang, Qiaomiao Tu, Lorraine F. Francis, Uwe R. Kortshagen
Summary: In this study, a tunable band gap range in zinc oxide nanocrystals films is achieved using atomic layer deposition and intense pulsed light. The importance of Al2O3 coating in band gap tuning is demonstrated.
Article
Nanoscience & Nanotechnology
Parker R. Wray, Mohammad Ali Eslamisaray, Gunnar M. Nelson, Ognjen Ilic, Uwe R. Kortshagen, Harry A. Atwater
Summary: Optically induced magnetic resonances (OMRs) are highly tunable scattering states that cannot be reproduced in systems that only support electric resonances. In this study, we synthesized OMR-based thin films composed of monodisperse crystalline silicon nanoparticles and investigated their absorption and scattering response. The results show that the thin films exhibit near complete blackbody absorption and strongly directional forward scattering, providing angle- and polarization-insensitive antireflection properties across the visible spectrum. A modified effective medium model considering multipole resonances and interparticle coupling is found to agree well with the experimental results.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Zhaohan Li, Zachary L. Robinson, Paolo Elvati, Angela Violi, Uwe R. Kortshagen
Summary: Understanding and controlling energy transfer between silicon nanocrystals is crucial for designing efficient optoelectronic devices. This study systematically investigates the distance-dependent resonance energy transfer in alkyl-terminated silicon nanocrystals. The results reveal that the energy transfer rates decay faster than predicted by the Forster mechanism, suggesting higher-order multipole interactions.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Electrochemistry
Tuan-Tu Nguyen, Bruno Delobel, Arnaud Demortiere, Charles Delacourt
Summary: This paper discusses the use of two physics-based models to analyze the discharge performance of high-energy-density electrodes. The analysis reveals a significant discrepancy between the actual discharge performance and the results predicted by the regular Newman pseudo-2D model, which does not consider particle agglomeration effects. By introducing an extension of the Newman model that accounts for agglomeration effects, the discharge rate capabilities of industry-grade electrodes with different electrolytes can be validated. The simulation results indicate that mitigating agglomeration effects can greatly improve the rate performance of high-energy electrodes at high C-rates.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Tuan-Tu Nguyen, Bruno Delobel, Maxime Berthe, Benoit Fleutot, Arnaud Demortiere, Charles Delacourt
Summary: Physics-based models of the Li-ion battery can help understand and quantify the electrode limitations, providing valuable insights for optimal electrode design in specific applications. This study presents a combined experimental/modeling approach using the Newman pseudo-2D model to characterize a set of LiNi0.5Mn0.3Co0.2O2 electrodes. The intrinsic properties of the active materials are determined and validated, and the high-energy-density electrode properties are characterized using appropriate experimental methods.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Ali Akhavan Kazemi, Nicolas Folastre, Parth Raval, Michel Sliwa, Jean Marie Vianney Nsanzimana, Sema Golonu, Arnaud Demortiere, Jean Rousset, Olivier Lafon, Laurent Delevoye, G. N. Manjunatha Reddy, Frederic Sauvage
Summary: Environmental stability is a major challenge for perovskite solar cells. Research has found that moisture can cause structural degradation, and has identified two competitive degradation pathways. Exposure to moisture leads to significant heterogeneities in the film.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Physical
Ana Cristina Martinez, Walid Dachraoui, Rajesh Murugesan, Emmanuel Baudrin, Arnaud Demortiere, Matthieu Becuwe
Summary: The study investigates the impact of chemical surface modification on the electrochemical response of nanometric lithium iron phosphate using a hybrid organic/inorganic approach. It was found that the redox mediator grafting approach has an unpredictable impact on the electrochemical activity of the material.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Physics, Applied
Chi Xu, Himashi P. Andaraarachchi, Zichang Xiong, Mohammad Ali Eslamisaray, Mark J. Kushner, Uwe R. Kortshagen
Summary: In this study, we demonstrate a surfactant-free method for synthesizing silver nanoparticles and achieve control over their size and uniformity by manipulating the droplet residence time and plasma power.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Jiahui Xu, Alain C. Ngandjong, Chaoyue Liu, Franco M. Zanotto, Oier Arcelus, Arnaud Demortiere, Alejandro A. Franco
Summary: The demand for lithium ion batteries (LIBs) is increasing and the development of digital twins to optimize LIB manufacturing processes is essential. A new three-dimensional physics-based modeling workflow is able to predict the influence of manufacturing parameters on electrode microstructure, providing more accurate simulation results through the use of Coarse-Grained Molecular Dynamics.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Ali Eslamisaray, Parker R. Wray, Yeonjoo Lee, Gunnar M. Nelson, Ognjen Ilic, Harry A. Atwater, Uwe R. Kortshagen
Summary: We have developed a bottom-up nonthermal plasma process to produce highly monodisperse optically Mie-resonant crystalline silicon nano particles. The particle size can be controlled between 60 and 214 nm by adjusting the gas residence time in the reactor. By dispersing the nanoparticles in water, we observed colloidal solutions of a particle-based metafluid, exhibiting strong magnetic and electric dipole resonances at visible wavelengths. The spectral overlap of the electric and magnetic resonances leads to directional Kerker scattering. The excellent agreement between extinction measurements and Mie theory confirms the narrow size, shape, and composition distributions enabled by our fabrication process. Moreover, this gas-phase process allows the production of Mie-resonant nanoparticles of dielectric materials other than silicon and their direct deposition onto desired substrates.
Article
Physics, Fluids & Plasmas
Zichang Xiong, Julian Held, Uwe Kortshagen
Summary: Nonthermal plasmas are attractive for nanoparticles synthesis, but their plasma properties are difficult to assess due to the reactive environment and high nanoparticle concentrations. In this study, we use a floating double probe to measure the plasma properties of an argon:silane plasma. We find that the electron temperatures increase unexpectedly with increasing silane mole fraction.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Yaling Liu, John Keil, Vivian E. Ferry, Uwe R. Kortshagen
Summary: Greenhouses provide a controlled environment for plant growth and offer resilience to droughts and extreme weather. Luminescent solar concentrators (LSCs) have the potential to reduce greenhouse energy demand by generating clean electricity and transmitting enough light for plant growth.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Nanoscience & Nanotechnology
Kristine Q. Loh, Himashi P. Andaraarachchi, Vivian E. Ferry, Uwe R. Kortshagen
Summary: Silicon quantum dots (Si QDs) are non-toxic, elementally abundant, and low-cost luminescent materials that find applications in various fields. This study presents a convenient and rapid technique, high-pressure water vapor annealing (HWA), for synthesizing Si/SiO2 core/shell quantum dots with tunable photoluminescence. The injection of additional hydrogen gas is found to be detrimental to achieving stable silica shells, while varying the applied pressure allows for tuning of the photoluminescence quantum yield. Thicker silica shells ensure environmentally stable quantum yields of >40%.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Chi Xu, Subhajyoti Chaudhuri, Julian Held, Himashi P. Andaraarachchi, George C. Schatz, Uwe R. Kortshagen
Summary: Low-temperature plasmas in and in contact with liquids have been found to be a catalyst-free method for the selective, electrode-free, and green synthesis of novel materials. Short-lived solvated electrons are considered as the critical reducing species in the synthesis of nanomaterials, while the role of ultraviolet (UV) photons from plasma is less explored. In this study, it is demonstrated that UV radiation contributes approximately 70% of the integral plasma effect in synthesizing silver (Ag) nanoparticles within a glycerol solution. The UV radiation causes C-H bond cleavage of the glycerol molecules, resulting in the reduction of Ag+ ions to Ag neutrals and the formation of nanoparticle in the liquid phase.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Thomas Cameron, Bailey Klause, Himashi Andaraarachchi, Zichang Xiong, Carter Reed, Dinesh Thapa, Chi-Chin Wu, Uwe R. Kortshagen
Summary: Capacitively coupled plasma (CCP) shows improved control and yield in the synthesis of aluminum nanoparticles compared to inductively coupled plasma (ICP), making it a promising method for various applications.