Publications
497 results found
Sharma A, AlGhamdi WS, Faber H, et al., 2023, Non-invasive, ultrasensitive detection of glucose in saliva using metal oxide transistors., Biosens Bioelectron, Vol: 237
Transistor-based biosensors represent an emerging technology for inexpensive point-of-care testing (POCT) applications. However, the limited sensitivity of the current transistor technologies hinders their practical deployment. In this study, we developed tri-channel In2O3/ZnO heterojunction thin-film transistors (TFTs) featuring the surface-immobilized enzyme glucose oxidase to detect glucose in various biofluids. This unusual channel design facilitates strong coupling between the electrons transported along the buried In2O3/ZnO heterointerface and the electrostatic perturbations caused by the interactions between glucose and surface-immobilized glucose oxidase. The enzyme selectively binds to glucose, causing a change in charge density on the channel surface. By exploring this effect, the solid-state biosensing TFT (BioTFT) can selectively detect glucose in artificial and real saliva over a wide range of concentrations from 500 nM to 20 mM with limits of detection of ∼365 pM (artificial saliva) and ∼416 nM (real saliva) in less than 60 s. The specificity of the sensor towards glucose has been demonstrated against various interfering species in artificial saliva, further highlighting its unique capabilities. Moreover, the BioTFTs exhibited good operating stability upon storage for up to two weeks, with relative standard deviation (RSD) values ranging from 2.36% to 6.39% for 500 nM glucose concentration. Our BioTFTs are easy to manufacture with reliable operation, making them ideal for non-invasive POCT applications.
Ling Z, Nugraha MI, Hadmojo WT, et al., 2023, Over 19% Efficiency in Ternary Organic Solar Cells Enabled by n-Type Dopants, ACS Energy Letters, Pages: 4104-4112, ISSN: 2380-8195
He Q, Shaw J, Firdaus Y, et al., 2023, p-Type Conjugated Polymers Containing Electron-Deficient Pentacyclic Azepinedione., Macromolecules, Vol: 56, Pages: 5825-5834, ISSN: 0024-9297
Bisthienoazepinedione (BTA) has been reported for constructing high-performing p-type conjugated polymers in organic electronics, but the ring extended version of BTA is not well explored. In this work, we report a new synthesis of a key building block to the ring expanded electron-deficient pentacyclic azepinedione (BTTA). Three copolymers of BTAA with benzodithiophene substituted by different side chains are prepared. These polymers exhibit similar energy levels and optical absorption in solution and solid state, while significant differences are revealed in their film morphologies and behavior in transistor and photovoltaic devices. The best-performing polymers in transistor devices contained alkylthienyl side chains on the BDT unit (pBDT-BTTA-2 and pBDT-BTTA-3) and demonstrated maximum saturation hole mobilities of 0.027 and 0.017 cm2 V-1 s-1. Blends of these polymers with PC71BM exhibited a best photovoltaic efficiency of 6.78% for pBDT-BTTA-3-based devices. Changing to a low band gap non-fullerene acceptor (BTP-eC9) resulted in improved efficiency of up to 13.5%. Our results are among the best device performances for BTA and BTTA-based p-type polymers and highlight the versatile applications of this electron-deficient BTTA unit.
Sahoo S, Kothavade PA, Naphade DR, et al., 2023, 3D-printed polymer composite devices based on a ferroelectric chiral ammonium salt for high-performance piezoelectric energy harvesting., Mater Horiz, Vol: 10, Pages: 3153-3161
Three-dimensional printing (3DP) is an emerging technology to fabricate complex architectures, necessary to realize state-of-the-art flexible and wearable electronic devices. In this regard, top-performing devices containing organic ferro- and piezoelectric compounds are desired to circumvent significant shortcomings of conventional piezoceramics, e.g. toxicity and high-temperature device processibility. Herein, we report on a 3D-printed composite of a chiral ferroelectric organic salt {[Me3CCH(Me)NH3][BF4]} (1) with a biodegradable polycaprolactone (PCL) polymer that serves as a highly efficient piezoelectric nanogenerator (PENG). The ferroelectric property of 1 originates from its polar tetragonal space group P42, verified by P-E loop measurements. The ferroelectric domain characteristics of 1 were further probed by piezoresponse force microscopy (PFM), which gave characteristic 'butterfly' and hysteresis loops. The PFM amplitude vs. drive voltage measurements gave a relatively high magnitude of the converse piezoelectric coefficient for 1. PCL polymer composites with various weight percentages (wt%) of 1 were prepared and subjected to piezoelectric energy harvesting tests, which gave a maximum open-circuit voltage of 36.2 V and a power density of 48.1 μW cm-2 for the 10 wt% 1-PCL champion device. Furthermore, a gyroid-shaped 3D-printed 10 wt% 1-PCL composite was fabricated to test its practical utility, which gave an excellent output voltage of 41 V and a power density of 56.8 μW cm-2. These studies promise the potential of simple organic compounds for building PENG devices using advanced manufacturing technologies.
Deswal S, Panday R, Naphade DR, et al., 2023, Design and Piezoelectric Energy Harvesting Properties of a Ferroelectric Cyclophosphazene Salt., Small
Cyclophosphazenes offer a robust and easily modifiable platform for a diverse range of functional systems that have found applications in a wide variety of areas. Herein, for the first time, it reports an organophosphazene-based supramolecular ferroelectric [(PhCH2 NH)6 P3 N3 Me]I, [PMe]I. The compound crystallizes in the polar space group Pc and its thin-film sample exhibits remnant polarization of 5 µC cm-2 . Vector piezoresponse force microscopy (PFM) measurements indicated the presence of multiaxial polarization. Subsequently, flexible composites of [PMe]I are fabricated for piezoelectric energy harvesting applications using thermoplastic polyurethane (TPU) as the matrix. The highest open-circuit voltages of 13.7 V and the maximum power density of 34.60 µW cm-2 are recorded for the poled 20 wt.% [PMe]I/TPU device. To understand the molecular origins of the high performance of [PMe]I-based mechanical energy harvesting devices, piezoelectric charge tensor values are obtained from DFT calculations of the single crystal structure. These indicate that the mechanical stress-induced distortions in the [PMe]I crystals are facilitated by the high flexibility of the layered supramolecular assembly.
Negahdary M, Sharma A, Anthopoulos TD, et al., 2023, Recent advances in electrochemical nanobiosensors for cardiac biomarkers, TrAC - Trends in Analytical Chemistry, Vol: 164, ISSN: 0165-9936
The WHO reports heart diseases, especially MI, are the leading cause of death. During a heart attack and damage to myocardial cells, cardiac biomarkers are released into the bloodstream. Their accurate measurement can be beneficial in the rapid screening of patients and the initiation of treatment. Rapid diagnosis of MI prevents secondary complications such as heart failure and will significantly reduce the mortality rate of patients. Electrochemical biosensors are cutting-edge diagnostic tools that successfully track the quantitative detection of several cardiac biomarkers. They are composed of three primary components: a biorecognition element, a signal transducer, and a detector. Here, the latest electrochemical biosensors developed in 2021–2023 have been collected and categorized, and their main features have been reviewed, analyzed, and compared. The most crucial biorecognition elements used in these biosensors include antibodies, oligonucleotides (especially: aptamers), and peptide sequences that are specifically selected and used to detect analytes. Equipping electrochemical biosensors with nanomaterials has increased diagnostic performance (especially sensitivity), facilitating reliable detection. These nanomaterials have been employed by modifying the surface of the signal transducer or optimizing the biorecognition element, or both. Investigating the most up-to-date platforms for detecting cardiac biomarkers and presenting their essential assembly features and diagnosis mechanisms can provide subsequent research avenues.
Wu J, Ling Z, Franco LR, et al., 2023, On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 ., Angew Chem Int Ed Engl
The determination of molecular conformations of oligomeric acceptors (OAs) and their impact on molecular packing are crucial for understanding the photovoltaic performance of their resulting polymer solar cells (PSCs) but have not been well studied yet. Herein, we synthesized two dimeric acceptor materials, DIBP3F-Se and DIBP3F-S, which bridged two segments of Y6-derivatives by selenophene and thiophene, respectively. Theoretical simulation and experimental 1D and 2D NMR spectroscopic studies prove that both dimers exhibit O-shaped conformations other than S- or U-shaped counter-ones. Notably, this O-shaped conformation is likely governed by a distinctive "conformational lock" mechanism, arising from the intensified intramolecular π-π interactions among their two terminal groups within the dimers. PSCs based on DIBP3F-Se deliver a maximum efficiency of 18.09 %, outperforming DIBP3F-S-based cells (16.11 %) and ranking among the highest efficiencies for OA-based PSCs. This work demonstrates a facile method to obtain OA conformations and highlights the potential of dimeric acceptors for high-performance PSCs.
Aljarb A, Min J, Hakami M, et al., 2023, Interfacial Reconstructed Layer Controls the Orientation of Monolayer Transition-Metal Dichalcogenides., ACS Nano, Vol: 17, Pages: 10010-10018
Growing continuous monolayer films of transition-metal dichalcogenides (TMDs) without the disruption of grain boundaries is essential to realize the full potential of these materials for future electronics and optoelectronics, but it remains a formidable challenge. It is generally believed that controlling the TMDs orientations on epitaxial substrates stems from matching the atomic registry, symmetry, and penetrable van der Waals forces. Interfacial reconstruction within the exceedingly narrow substrate-epilayer gap has been anticipated. However, its role in the growth mechanism has not been intensively investigated. Here, we report the experimental conformation of an interfacial reconstructed (IR) layer within the substrate-epilayer gap. Such an IR layer profoundly impacts the orientations of nucleating TMDs domains and, thus, affects the materials' properties. These findings provide deeper insights into the buried interface that could have profound implications for the development of TMD-based electronics and optoelectronics.
Panca A, Panidi J, Faber H, et al., 2023, Flexible Oxide Thin Film Transistors, Memristors, and Their Integration, Advanced Functional Materials, Vol: 33, ISSN: 1616-301X
Flexible electronics have seen extensive research over the past years due to their potential stretchability and adaptability to non-flat surfaces. They are key to realizing low-power sensors and circuits for wearable electronics and Internet of Things (IoT) applications. Semiconducting metal-oxides are a prime candidate for implementing flexible electronics as their conformal deposition methods lend themselves to the idiosyncrasies of non-rigid substrates. They are also a major component for the development of resistive memories (memristors) and as such their monolithic integration with thin film electronics has the potential to lead to novel all-metal-oxide devices combining memory and computing on a single node. This review focuses on exploring the recent advances across all these fronts starting from types of suitable substrates and their mechanical properties, different types of fabrication methods for thin film transistors and memristors applicable to flexible substrates (vacuum- or solution-based), applications and comparison with rigid substrates while additionally delving into matters associated with their monolithic integration.
Duijnstee EA, Gallant BM, Holzhey P, et al., 2023, Understanding the Degradation of Methylenediammonium and Its Role in Phase-Stabilizing Formamidinium Lead Triiodide., J Am Chem Soc, Vol: 145, Pages: 10275-10284
Formamidinium lead triiodide (FAPbI3) is the leading candidate for single-junction metal-halide perovskite photovoltaics, despite the metastability of this phase. To enhance its ambient-phase stability and produce world-record photovoltaic efficiencies, methylenediammonium dichloride (MDACl2) has been used as an additive in FAPbI3. MDA2+ has been reported as incorporated into the perovskite lattice alongside Cl-. However, the precise function and role of MDA2+ remain uncertain. Here, we grow FAPbI3 single crystals from a solution containing MDACl2 (FAPbI3-M). We demonstrate that FAPbI3-M crystals are stable against transformation to the photoinactive δ-phase for more than one year under ambient conditions. Critically, we reveal that MDA2+ is not the direct cause of the enhanced material stability. Instead, MDA2+ degrades rapidly to produce ammonium and methaniminium, which subsequently oligomerizes to yield hexamethylenetetramine (HMTA). FAPbI3 crystals grown from a solution containing HMTA (FAPbI3-H) replicate the enhanced α-phase stability of FAPbI3-M. However, we further determine that HMTA is unstable in the perovskite precursor solution, where reaction with FA+ is possible, leading instead to the formation of tetrahydrotriazinium (THTZ-H+). By a combination of liquid- and solid-state NMR techniques, we show that THTZ-H+ is selectively incorporated into the bulk of both FAPbI3-M and FAPbI3-H at ∼0.5 mol % and infer that this addition is responsible for the improved α-phase stability.
Nugraha MI, Indriyati I, Primadona I, et al., 2023, Recent Progress in Colloidal Quantum Dot Thermoelectrics., Adv Mater
Semiconducting colloidal quantum dots (CQDs) represent an emerging class of thermoelectric materials for use in a wide range of future applications. CQDs combine solution processability at low temperatures with the potential for upscalable manufacturing via printing techniques. Moreover, due to their low dimensionality, CQDs exhibit quantum confinement and a high density of grain boundaries, which can be independently exploited to tune the Seebeck coefficient and thermal conductivity, respectively. This unique combination of attractive attributes makes CQDs very promising for application in emerging thermoelectric generator (TEG) technologies operating near room temperature. Herein, recent progress in CQDs for application in emerging thin-film thermoelectrics is reviewed. First, the fundamental concepts of thermoelectricity in nanostructured materials are outlined, followed by an overview of the popular synthetic methods used to produce CQDs with controllable sizes and shapes. Recent strides in CQD-based thermoelectrics are then discussed with emphasis on their application in thin-film TEGs. Finally, the current challenges and future perspectives for further enhancing the performance of CQD-based thermoelectric materials for future applications are discussed.
Rahmawati I, Indriyati, Permatasari FA, et al., 2023, Modulating Photothermal Properties of Carbon Dots through Nitrogen Incorporation Enables Efficient Solar Water Evaporation, ACS APPLIED NANO MATERIALS
Lin Y, Zhang Y, Magomedov A, et al., 2023, 18.73% efficient and stable inverted organic photovoltaics featuring a hybrid hole-extraction layer, MATERIALS HORIZONS, ISSN: 2051-6347
Prajesh N, Naphade DR, Yadav A, et al., 2023, Visualization of domain structure and piezoelectric energy harvesting in a ferroelectric metal-ligand cage, CHEMICAL COMMUNICATIONS, Vol: 59, Pages: 2919-2922, ISSN: 1359-7345
He Q, Basu A, Cha H, et al., 2023, Ultra-Narrowband Near-Infrared Responsive J-Aggregates of Fused Quinoidal Tetracyanoindacenodithiophene, ADVANCED MATERIALS, ISSN: 0935-9648
Portilla L, Loganathan K, Faber H, et al., 2023, Wirelessly powered large-area electronics for the Internet of Things (vol 6, pg.no: 10, 2023), NATURE ELECTRONICS, ISSN: 2520-1131
Mandal S, Hou Y, Wang M, et al., 2023, Surface Modification of Hetero-phase Nanoparticles for Low-Cost Solution-Processable High-k Dielectric Polymer Nanocomposites, ACS APPLIED MATERIALS & INTERFACES, ISSN: 1944-8244
Yarali E, El-Demellawi JK, Faber H, et al., 2023, Fully Sprayed Metal Oxide Transistors Utilizing Ti3C2TX MXene Contacts, ACS APPLIED ELECTRONIC MATERIALS
Anies F, Nugraha MI, Fall A, et al., 2023, In Situ Generation of n-Type Dopants by Thermal Decarboxylation, ADVANCED FUNCTIONAL MATERIALS, ISSN: 1616-301X
Chen H, Jeong SY, Tian J, et al., 2023, A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology, ENERGY & ENVIRONMENTAL SCIENCE, ISSN: 1754-5692
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Hu X, Basu A, Rimmele M, et al., 2022, N-type polymer semiconductors incorporating heteroannulated benzothiadiazole, POLYMER CHEMISTRY, Vol: 14, Pages: 469-476, ISSN: 1759-9954
Portilla L, Loganathan K, Faber H, et al., 2022, Wirelessly powered large-area electronics for the Internet of Things, NATURE ELECTRONICS, Vol: 6, Pages: 10-17, ISSN: 2520-1131
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- Citations: 1
Griggs S, Marks A, Meli D, et al., 2022, The effect of residual palladium on the performance of organic electrochemical transistors., Nat Commun, Vol: 13
Organic electrochemical transistors are a promising technology for bioelectronic devices, with applications in neuromorphic computing and healthcare. The active component enabling an organic electrochemical transistor is the organic mixed ionic-electronic conductor whose optimization is critical for realizing high-performing devices. In this study, the influence of purity and molecular weight is examined for a p-type polythiophene and an n-type naphthalene diimide-based polymer in improving the performance and safety of organic electrochemical transistors. Our preparative GPC purification reduced the Pd content in the polymers and improved their organic electrochemical transistor mobility by ~60% and 80% for the p- and n-type materials, respectively. These findings demonstrate the paramount importance of removing residual Pd, which was concluded to be more critical than optimization of a polymer's molecular weight, to improve organic electrochemical transistor performance and that there is readily available improvement in performance and stability of many of the reported organic mixed ionic-electronic conductors.
AlGhamdi WS, Fakieh A, Faber H, et al., 2022, Impact of layer thickness on the operating characteristics of In2O3/ZnO heterojunction thin-film transistors, APPLIED PHYSICS LETTERS, Vol: 121, ISSN: 0003-6951
Vaseem M, Akhter Z, Li W, et al., 2022, High-conductivity screen-printable silver nanowire Ink for optically transparent flexible radio frequency electronics, FLEXIBLE AND PRINTED ELECTRONICS, Vol: 7, ISSN: 2058-8585
Isikgor FH, Maksudov T, Chang X, et al., 2022, Monolithic Perovskite-Perovskite-Organic Triple-Junction Solar Cells with a Voltage Output Exceeding 3 V, ACS ENERGY LETTERS, Vol: 7, Pages: 4469-4471, ISSN: 2380-8195
Lin Y, Zhang Y, Zhang J, et al., 2022, 18.9% Efficient Organic Solar Cells Based on n-Doped Bulk-Heterojunction and Halogen-Substituted Self-Assembled Monolayers as Hole Extracting Interlayers, ADVANCED ENERGY MATERIALS, Vol: 12, ISSN: 1614-6832
Gedda M, Gkeka D, Nugraha MI, et al., 2022, High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers, ADVANCED ENERGY MATERIALS, ISSN: 1614-6832
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Liang J-W, Firdaus Y, Azmi R, et al., 2022, Cl-2-Doped CuSCN Hole Transport Layer for Organic and Perovskite Solar Cells with Improved Stability, ACS ENERGY LETTERS, Vol: 7, Pages: 3139-3148, ISSN: 2380-8195
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Wahyudi W, Guo X, Ladelta V, et al., 2022, Hitherto Unknown Solvent and Anion Pairs in Solvation Structures Reveal New Insights into High-Performance Lithium-Ion Batteries, ADVANCED SCIENCE, Vol: 9
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- Citations: 3
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