Article
Chemistry, Physical
Aldo Ugolotti, Cristiana Di Valentin
Summary: This study focuses on two models of melem-based gCN structures and investigates their optical properties, including vibrational and electronic excitations, through computational calculations. The numerical results are compared with experimental data and the role of different polymeric arrangements is discussed.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Adrian Fontana-Escartin, Guillem Ruano, Fiorella M. Silva, Francesc Estrany, Jordi Puiggali, Carlos Aleman, Juan Torras
Summary: In this study, a new interpenetrated polymer network (IPN) was successfully prepared by electrochemically interpenetrating conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) with a biodegradable hydrogel poly(aspartic acid) (PASP) using poly(hydroxymethyl-3,4-ethylenedioxythiophene) (PHMeDOT). The optimized material exhibited excellent electrical conductivity, biocompatibility, bioactivity, and biodegradability, making it potentially valuable for biomedical applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Physics, Applied
Yukihiro Tsugita, Shuichi Maeda
Summary: Conductive inks were developed by combining indium tin oxide (ITO) with polypyrrole. The zeta potentials of the resulting polypyrrole-ITO inks were found to be pH-dependent, with zero zeta potential at pH 5. Thermogravimetric analysis revealed the thermal behavior of ITO and its inks. The conductivities of the inks were measured and compared to the neat polymer, showing excellent conductivity even at low temperatures for LED lighting.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ummu Raihanah Hashim, Aidah Jumahat, Mohammad Jawaid
Summary: Basalt fibre (BF) is a promising natural reinforcing material for polymer composites, and when modified with nanofillers like graphene nanoplatelets (GNP) and nanosilica (NS), it shows enhanced mechanical properties. The incorporation of hybrid nanofillers contributes to the improvement in the mechanical properties of the composites, especially in terms of modulus and strength. This study demonstrates the potential of BF as an alternative to synthetic glass fibre for mechanical components and structures.
Article
Chemistry, Multidisciplinary
Santanu Jana, Rodrigo Martins, Elvira Fortunato
Summary: An exceptional feature of one-dimensional threadlike assemblies of a four-monolayer colloidal CdSe nanoplatelet-based thin-film transistor is reported. The study shows that the length of the threads affects the mobility, with the film containing the longest threads exhibiting the highest conductivity and electron mobility. The mobility trends are driven by the lower defects in the longer threads, resulting in less loss of electron hopping.
Article
Chemistry, Physical
Mahdi Hamidinejad, Meysam Salari, Li Ma, Nima Moghimian, B. Zhao, Hayden K. Taylor, Tobin Filleter, Chul B. Park
Summary: Polymer composites with graded microcellular structures containing graphene nanoplatelets were successfully fabricated via supercritical fluid treatment and rapid depressurization in an injection molding machine. This distinct microstructure led to graded electrical and thermal properties in the composites, showing potential for applications in electromagnetic shielding, energy storage materials, and sensors.
Review
Energy & Fuels
Elumalai Dhandapani, Sadhasivam Thangarasu, S. Ramesh, K. Ramesh, R. Vasudevan, Navaneethan Duraisamy
Summary: This article discusses the recent developments in active electrode materials in supercapacitors, focusing on the applications of carbonaceous materials and conducting polymers in this field.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Engineering, Biomedical
Julian Heck, Josef Goding, Roberto Portillo Lara, Rylie Green
Summary: This review examines the inherent properties of conducting polymers (CPs) that have hindered their use in additive manufacturing for 3D bioelectronics. It presents a fundamental approach considering the chemical structure and its contribution to electrical, thermal, and mechanical properties. The review discusses how the manipulation of these properties has been addressed in the literature and identifies areas for improvement. Furthermore, it details the current use of CPs in additive manufacturing and the potential future applications of CPs and their composites in the development of 3D bioelectronics.
ACTA BIOMATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Jichuan Qiu, Yuxin Shang, Jianchang Xu, Younan Xia
Summary: The dissolution of a polymeric solid is a complex process that involves swelling and volume expansion before polymer chains can be disentangled and dissolved into a solvent. Recent studies have started to shed light on the mechanistic details involved in the formation of hollow particles through a template-directed process.
Article
Chemistry, Physical
O. I. V'yunov, T. O. Plutenko, O. P. Fedorchuk, A. G. Belous, Ye. V. Lobko
Summary: Ceramic samples of Na-doped lithium lanthanum titanates were synthesized by solid-state reaction technique. The grain size of ceramics decreased with an increase in sodium concentration, and the sample with the largest dielectric constant value was La0.5Li0.4Na0.1TiO3.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Ankan Kumar Sarkar, Koushik Debnath, Himali Arora, Pankaj Seth, Nihar R. Jana, Nikhil R. Jana
Summary: The direct cytosolic delivery of large biomolecules bypassing endocytic pathways is a promising strategy for therapeutic applications. Recent research has shown that surface chemistry of carriers, nanoscale assembly, colloidal stability, and low surface charge are critical for non-endocytic uptake processes. The guanidinium-terminated polyaspartic acid micelle can deliver protein/DNA directly to the cytosol by forming a nano-assembly with <200 nm size and near-zero surface charge, highlighting the importance of size and colloidal properties for efficient cytosolic delivery of large biomolecules.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Amirreza Shayganpour, Marialaura Clausi, Ilker S. Bayer
Summary: Hematite and graphene nanoplatelet hybrids were prepared in a rubbery latex matrix in this study, showing promising thermal properties. Optimization of filler concentration and ratio yielded thermal interface material films with enhanced heat dissipation and rapid heat transfer capabilities.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Biomedical
M. J. Martinez-Morlanes, F. J. Pascual, G. Guerin, J. A. Puertolas
Summary: The use of non-functionalised graphene nanoplatelet (GNP) as a reinforcement in composite coatings on a UHMWPE substrate improved wear resistance, with different mechanical mixing techniques and consolidation temperatures affecting friction coefficient and hardness.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Tomasz Wozniak, Paulo E. Umm-e-hani, Paulo Faria S. Junior, Muhammad B. Ramzan, Agnieszka Kuc
Summary: MA(2)Z(4) monolayers represent a new class of hexagonal non-centrosymmetric materials with unique spin-valley physics. The study investigates the chemical trends of band gaps and spin-orbit splittings in selected MSi(2)Z(4) compounds, and predicts high exciton binding energies using effective Bethe-Salpeter-equation-based calculations. The research also shows the potential of MSi(2)Z(4) monolayers as a platform to study excitons and their application in optoelectronic devices, including heterostructures. Additionally, a spin-orbit induced band inversion is observed in the heaviest compound WSi2Sb4, indicating its topological nature.
Article
Materials Science, Composites
Julio Alejandro Rodriguez-Gonzalez, Carlos Rubio-Gonzalez
Summary: The weight concentration of graphene nanoplatelets (GNPs) significantly affects the electrical, mechanical, thermal-mechanical, and piezoresistive properties of glass fiber/epoxy composite laminates. While the addition of GNPs improves electrical conductivity and strain sensing capabilities, it also decreases interlaminar shear strength and flexural strength. However, the flexural modulus remains relatively unchanged, and a slight increase in glass transition temperature is observed in samples with 1.00 wt% GNPs.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Multidisciplinary
Hoang Long Nguyen, Thanh Nhut Do, Emek G. Durmusoglu, Merve Izmir, Ritabrata Sarkar, Sougata Pal, Oleg V. Prezhdo, Hilmi Volkan Demir, Howe-Siang Tan
Summary: In this study, the ultrafast spectral diffusion, vibronic dynamics, and energy relaxation of CdSe colloidal quantum wells (CQWs) at room temperature were measured using two-dimensional electronic spectroscopy (2DES). The energy relaxation from light-hole (LH) excitons to heavy-hole (HH) excitons was observed to occur within a time scale of approximately 210 fs. Equilibration dynamics between the spectroscopically accessible HH excitonic state and a dark state were found to take place within a time scale of approximately 160 fs. The spectral diffusion dynamics in HH excitons were analyzed using center line slope analysis, revealing a sub-200 fs decay and oscillatory features resolved at 4 and 25 meV. Quantum calculations were performed to replicate and explain the observed dynamics. The 4 meV mode was found to be in the near-critically damped regime and may mediate the transition between the bright and dark HH excitons. These findings demonstrate the capability of 2DES to comprehensively and detailedly characterize the ultrafast spectral properties in CQWs and similar nanomaterials.
Article
Chemistry, Multidisciplinary
Farzan Shabani, Pedro Ludwig Hernandez Martinez, Nina Shermet, Hilal Korkut, Ibrahim Sarpkaya, Hamed Dehghanpour Baruj, Savas Delikanli, Furkan Isik, Emek Goksu Durmusoglu, Hilmi Volkan Demir
Summary: This work presents the synthesis and optical characterization of CdSe/CdSeTe/CdTe core/crown/crown nanoplatelets (NPLs) with a stepwise gradient electronic structure. The excitonic properties of the NPLs can be finely tuned through adjusting the geometry of the intermediate crown. These NPLs exhibit long-lifetime red-shifted emission spectra and high two-photon absorption cross-sections, making them promising for designing complex heterostructures with remarkable properties.
Article
Chemistry, Multidisciplinary
Roman A. Babunts, Yulia A. Uspenskaya, Nikolai G. Romanov, Sergei B. Orlinskii, Georgy V. Mamin, Elena V. Shornikova, Dmitri R. Yakovlev, Manfred Bayer, Furkan Isik, Sushant Shendre, Savas Delikanli, Hilmi Volkan Demir, Pavel G. Baranov
Summary: Semiconductor colloidal nanoplatelets based on CdSe with magnetic Mn2+ ions show modified magneto-optical and spin-dependent properties. High-frequency electron paramagnetic resonance techniques were used to study the spin structure and dynamics of Mn2+ ions in core/shell CdSe/(Cd,Mn)S nanoplatelets. Two sets of resonances were observed, indicating different spin dynamics between surface and inner Mn2+ ions. The interaction between surface Mn2+ ions and 1H nuclei was measured using electron nuclear double resonance, providing information on the distances between Mn2+ ions and 1H nuclei.
Article
Chemistry, Multidisciplinary
M. A. Masharin, A. K. Samusev, A. A. Bogdanov, I. V. Iorsh, H. V. Demir, S. V. Makarov
Summary: Excitons in lead bromide perovskites have a high binding energy and high oscillator strength, which enables strong light-matter coupling in perovskite-based cavities at the nanoscale. In this study, a perovskite metasurface fabricated with nanoimprint lithography is used to demonstrate room-temperature polariton lasing. The observed lasing emission has a high directivity and compatibility with various planar photonic platforms.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Farzan Shabani, Muhammad Ahmad, Satish Kumar, Savas Delikanli, Furkan Isik, Arinjoy Bhattacharya, Athos Petrou, Hilmi Volkan Demir
Summary: Two-dimensional (2D) core/shell nanoplatelets (NPLs) synthesized via the hot-injection method provide excellent thermal and chemical stability for high-temperature doping. A thermodynamic approach toward silver doping of these NPLs is proposed and demonstrated. The distribution of silver ions in the lattice of the NPLs directly affects the recombination dynamics and enables fine-tuning of the near-infrared emission.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Merve Izmir, Emek G. Durmusoglu, Manoj Sharma, Farzan Shabani, Furkan Isik, Savas Delikanli, Vijay Kumar Sharma, Hilmi Volkan Demir
Summary: In this study, ytterbium (Yb) was successfully doped into cadmium selenide (CdSe) nanoplatelets (NPLs) using a modified seeded-growth method. The Yb-doped NPLs exhibited additional near-infrared (NIR) emission apart from their excitonic emission. By optimizing the dopant concentration, an impressive photoluminescence quantum yield (PL QY) of approximately 55% was achieved. Detailed elemental and optical characterizations were performed to understand the emerging photophysical properties of these Yb-doped NPLs. These lanthanide-doped CdSe NPLs emitting in the NIR range could find applications in next-generation bioimaging, night vision, and photodetection.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Yi Tian Thung, Rui Duan, Emek G. Durmusoglu, Yichen He, Lian Xiao, Calvin Xiu Xian Lee, Wen Siang Lew, Lin Zhang, Hilmi Volkan Demir, Handong Sun
Summary: Colloidal quantum wells (CQWs) are a promising gain material for optical feedback due to their unique excitonic features from 1D confinement, but current integration methods result in low laser quality. To address this, a liquid-interface kinetically driven self-assembly method is proposed to coat ultrathin CQWs onto silica microsphere cavities, achieving high-quality microlasers with a Q-factor of 13,000 at room temperature. Stable single-mode lasing output is demonstrated through evanescent field coupling in a 2D-3D microcavity configuration, highlighting the potential for future miniaturized colloidal optoelectronic and photonic applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Ahmet Tarik Isik, Farzan Shabani, Furkan Isik, Satish Kumar, Savas Delikanli, Hilmi Volkan Demir
Summary: Micro/nanoscale semiconductor multicolor lasers have great potential for improved photonic circuits. This work proposes and demonstrates multicolor optical gain and lasing from colloidal quantum wells (CQWs) in an all-solution processed optical cavity. A layered architecture with a transparent low refractive index colloidal spacing layer is designed to suppress nonradiative energy transfer and enable simultaneous amplified spontaneous emission in two colors. This architecture is adapted to a whispering-gallery-mode cavity, resulting in dual-color multimode lasing at 569 and 648 nm.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Hamed Dehghanpour Baruj, Iklim Bozkaya, Betul Canimkurbey, Ahmet Tarik Isik, Farzan Shabani, Savas Delikanli, Sushant Shendre, Onur Erdem, Furkan Isik, Hilmi Volkan Demir
Summary: Solution-processed colloidal quantum well light-emitting diodes (CQW-LEDs) with a single all-face-down oriented self-assembled monolayer (SAM) film of CQWs exhibit improved external quantum efficiency and outcoupling efficiency. The record-high external quantum efficiency of 18.1% and other favorable performance metrics indicate the effectiveness of oriented self-assembly of CQWs in CQW-LEDs.
Article
Nanoscience & Nanotechnology
Junhong Yu, Emek Goksu Durmusoglu, Yimeng Wang, Manoj Sharma, Hilmi Volkan Demir, Cuong Dang
Summary: Manipulating optical transition in semiconductors at ultrashort timescales is crucial for photonic applications. The traditional methods include electrostatic gating via Stark effects or band-gap renormalizations. This study introduces an all-optical approach to engineer an indirect transition in CdSe/CdTe core-crown colloidal quantum wells, with tunable energy shift and dynamics. The findings suggest promising applications in optical switching networks.
Article
Nanoscience & Nanotechnology
Pavel A. Dmitriev, Emmanuel Lassalle, Lu Ding, Zhenying Pan, Darren C. J. Neo, Vytautas Valuckas, Ramon Paniagua-Dominguez, Joel K. W. Yang, Hilmi Volkan Demir, Arseniy I. Kuznetsov
Summary: In this study, we propose and demonstrate single subwavelength hybrid dielectric-plasmonic optical nanoantennas that are coupled to localized quantum dot emitters and serve as efficient and bright unidirectional photon sources. The structure supports both antenna mode and gap mode resonances, and the resonance spectral positions can be controlled by tuning geometrical parameters. Experimental results show fluorescence enhancement factors up to 654x folds, mainly due to high radiative efficiencies, and directional emission of the photoluminescence into a cone of +/- 17 degrees normal to the sample plane. We believe this solution is viable and relevant for the next generation of light-emitting devices.
Review
Chemistry, Physical
Joanna Dehnel, Adi Harchol, Yahel Barak, Itay Meir, Faris Horani, Arthur Shapiro, Rotem Strassberg, Celso de Mello Donega, Hilmi Volkan Demir, Daniel R. Gamelin, Kusha Sharma, Efrat Lifshitz
Summary: Incorporating magnetic ions into semiconductor nanocrystals is a promising research field for manipulating spin-related properties. Various host materials and magnetic ions have been studied, and the impact of nanostructure engineering and ion selection in carrier-magnetic ion interactions is emphasized. The use of optically detected magnetic resonance spectroscopy provides valuable insights into the spin dynamics and physical parameters of the carrier-magnetic ion interactions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Manpreet Kaur, Ashma Sharma, Onur Erdem, Akshay Kumar, Hilmi Volkan Demir, Manoj Sharma
Summary: Doping of alloyed colloidal quantum dots (QDs) has gained attention for their tunable and Stokes-shifted emission. High-quality Cu and Mn-doped ZnxCd1-xS alloyed QDs were synthesized, and the addition of a ZnS shell significantly improved their quantum yield (QY).
Article
Optics
Tevfik bulent Kanmaz, Efe Ozturk, Hilmi volkan Demir, Cigdem Gunduz-demir
Summary: This paper proposes and demonstrates a deep-learning-enabled method for rapid prediction of electromagnetic near-field response and inverse prediction of metasurface designs. By using an encoder-decoder neural network, the common limitation of predicting only transmission spectra is overcome.
Article
Chemistry, Multidisciplinary
Kubra Onbasli, Gozde Demirci, Furkan Isik, Emek Goksu Durmusoglu, Hilmi Volkan Demir, Havva Yagci Acar
Summary: Fluorescent, CdSe/CdS core/crown heterostructured nanoplatelets (NPLs) were transferred to water through a single-step ligand exchange using 2-mercaptopropionic acid. These stable, aqueous NPLs were loaded with a drug, 5-aminolevulinic acid (ALA), and were used for enhanced photodynamic therapy of both androgen-dependent and -independent human prostate cancer cells.
CHEMICAL COMMUNICATIONS
(2023)