bluuebunny/crossref_metadata_2025_split huggingface dataset:
(Invited) Degradation Processes at the Potassium Hexacyanoferrate Electrode in Potassium-Ion Batteries
Authors: Khudyshkina Anna D. , Panasenko Iurii , Henkel Philip , Njel Christian , Jeschull Fabian 
Published: November 2022

Prussian blue analogues (PBAs)[1] with the general composition A2M[Fe(CN)6] (A: alkali metal; M: Fe, Mn, etc) are an attractive positive electrode for potassium-ion batteries, owing to their chemical composition based on widely abundant materials, ease of synthesis, high electrochemical reversibility and higher average potential compared to its sodium congener [1]. The combination of a PBA electrode with a graphite negative electrode in a full cell configuration showed great promise as post-Li battery system. However, the upper cut-off potentials of K2Fe[Fe(CN)6] and K2Mn[Fe(CN)6] pose serious stability issues with respect to irreversible electrolyte degradation reactions. In addition, the electrolyte components have to be compatible with the potassium intercalation reaction at the graphite electrode[2], thus limiting the number of suitable electrolyte constituents.
In this presentation, we discuss aspects of the material synthesis and electrolyte degradation processes at high potentials in liquid carbonate-based electrolytes. As we will be shown the choice of the precursors is paramount to arrive at suitable particle sizes and has a great impact on the electrochemical behavior of the material. Likewise, the density of Fe-vacancies strongly depends on the chosen synthesis and may lead to significant losses in the achievable discharge capacity.
The electrode-electrolyte interface in half and full cell configurations was studied by in-house and synchrotron-based photoelectron spectroscopy (PES) for a detailed characterization of the surface layer and the oxidation states of iron in K2Fe[Fe(CN)6] electrodes. This combined analysis of electrochemical and surface-sensitive analytical studies provides a general picture of the electrode degradation at high potentials and fosters the development of better electrolyte mixtures. Our results further show, how a deliberate choice of electrolyte components can help to reduce irreversible reactions and improve cycling stability and cycle life of potassium-ion batteries. For this we have recently expanded our activities also to solid polymer electrolytes, showing superior capacity retention to liquid electrolyte systems[3].
Figure 1. left: K2Fe[Fe(CN)6] obtained using different Fe-precursors; right: capacity retention of PBA-K cells cycled in either a liquid (black) or solid polymer (red/purple) electrolyte.

Reference
s
:

[1] Kim et al., Trends Chem. 1 (2019) 682–692.
[2] Allgayer et al., ACS Appl. Energy Mater. 5 (2022) 1136–1148.
[3] Khudyshkina et al., ACS Appl. Polym. Mater. 4 (2022) 2734–2746.

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(Digital Presentation) Electrochemistry and Structural Study of Manganese Hexacyanoferrate Cathode Material in Aqueous Zn-Ion Battery
Authors: Li Min , Sciacca Rosalinda , Maisuradze Mariam , Aquilanti Giuliana , Plaisier Jasper Rikkert , Berrettoni Mario , Giorgetti Marco 
Published: November 2022

Aqueous rechargeable Zinc-ion batteries (ARZIBs) have attracted extensive attention as one of the most promising post-lithium ion battery candidates for large-scale electrochemical applications, because of their low cost, intrinsic safety, and environmental friendliness. The metallic zinc, as an ideal anode material shows high theoretical gravimetric and volumetric capacity of 820 mAh g-1 and 5855 mAh cm-3, low electrochemical potential (-0.76 V vs. SHE) and high abundance.[1,2]
Manganese hexacyanoferrate (MnHCF), one of the Prussian blue analogues (PBAs), has attracted widely attention as promising cathode material for Li-ion and post-Li ion batteries. MnHCF is composed of only highly abundant metals and displays large capacity and high discharge potential owning to the two-redox active sites [3-4]. Here, the electrochemical performance of MnHCF was studied in 3 M ZnSO4 aqueous electrolyte with Zn sheet as anode. The battery exhibits high specific capacity (176 mAhg-1) at C/20, and around 61% capacity retention after 50 cycles at C/5. In order to explain the capacity fading problems during cycling, the local geometric, electronic structures, as well as the framework structure change of MnHCF electrode were studied by means of ex-situ X-ray absorption spectroscopy (XAS) and synchrotron X-ray diffraction (XRD). Based on XAS data, no obvious change was observed at the Fe K-edge during cycling, and this indicates that there is no apparent change of the local Fe structural environment. However, the XAS spectra of Mn K-edge exhibit an apparent change after 10 cycles. The Zn K-edge shows a typical -Zn-NC-Fe- structural framework in the cycled samples that resembles the one of zinc hexacyanoferrate (ZnHCF), providing evidence for Zn-Mn partially replacement upon cycling, resulting in dissolution the Mn ion [5]. From the ex-situ XRD data, we found that this phase changes mainly concerns early cycles, because the XRD patterns of the 2nd and 10th cycle are almost identical. ZnHCF phase formed even during the first charge process. The more detailed phase transformation process is still under studying. By combing the ex-situ XAS and XRD data, the charge/discharge mechanism of MnHCF in aqueous Zn-ion battery can be more clearly illustrated.

Trócoli, F. La Mantia, ChemSusChem. 8, 2015, 481–485.

Tang, L. Shan, S. Liang, J. Zhou, Energy Environ. Sci. 12, 2019, 3288–3304.

Mullaliu, J. Asenbauer, G. Aquilanti, S. Passerini, M. Giorgetti. Small Methods, 2019, 1900529.

Mullaliu, M. Gaboardi, J. R. Plaisier, S. Passerini, and M. Giorgetti, ACS Applied Energy Materials 3, 2020, 5728.

Li, R. Sciacca, M. Maisuradze, G. Aquilanti, J. Plaisier, M. Berrettoni, M. Giorgetti, Electrochim. Acta. 400 ,2021.
The Adsorption of Bipyridine on Single-Crystal Electrodes from an Ionic Liquid Electrolyte
Authors: Ers Heigo , Siinor Liis , Lust Enn , Pikma Piret 
Published: November 2022

The self-assembly of adsorbed molecules into structured adlayers on the electrode’s surface provides a straightforward way to modify the interface. Moreover, the formation and properties of the formed adlayers can be controlled by the applied potential, which offers fascinating prospects for the development of molecular switches1, thin film transistors2, and sensors3. Ionic liquids are a class of unique electrolytes, which properties differ notably from common aqueous or organic electrolytes. For example, due to good electrochemical stability and low vapour pressure of ionic liquids4, the adlayer formation process can be studied and the interfacial properties tuned in a significantly larger potential range.
In the given presentation, we will focus on the adsorption of 4,4’-bipyridine (4,4’-BP) on single-crystal model electrodes from ionic liquid electrolyte. To gain insight into the process and formed structures, we have combined electrochemical impedance spectroscopy and in situ scanning tunnelling microscopy measurements with density functional theory calculations. The results show the formation of two distinct 4,4’-BP adlayers on the Sb(111) electrode on top of each other, visualized thanks to the occurrence of partial reductive desorption of 4,4’-BP5. In the case of the Cd(0001) surface, a similar reduction process was visible in the cyclic voltammetry and capacitance, potential dependences, although the formed 4,4’-BP adlayers were not visible with the in situ STM.

Acknowledgments:

This work was supported by the Estonian Research Council grant PSG249, and by the EU through the European Regional Development Fund under project TK141 (2014-2020.4.01.15-0011).

References:

Yasini, P. et al. Potential-Induced High-Conductance Transport Pathways through Single-Molecule Junctions. J. Am. Chem. Soc
141, 10109–10116 (2019).

Casalini, S., Bortolotti, C. A., Leonardi, F. & Biscarini, F. Self-assembled monolayers in organic electronics. Chem. Soc. Rev.
46, 40–71 (2017).

Singh, M., Kaur, N. & Comini, E. The role of self-assembled monolayers in electronic devices. J. Mater. Chem. C
8, 3938–3955 (2020).

Galiński, M., Lewandowski, A. & Stepniak, I. Ionic liquids as electrolytes. Electrochim. Acta
51, 5567–5580 (2006).

Ers, H., Siinor, L., Siimenson, C., Lust, E. & Pikma, P. Order beyond a monolayer: The story of two self-assembled 4,4′-bipyridine layers on the Sb(111) | ionic liquid interface. Electrochim. Acta
421, 140468 (2022).
Direct Observation of the Sporicidal Action of Hydrogen Peroxide on Bacillus atrophaeus Spores By Optical Trapping Raman Microscopy
Authors: Bertz Morten , Molinnus Denise , Schoening Michael J. , Homma Takayuki 
Published: November 2022

Hydrogen peroxide (H2O2), a strong oxidizer, is frequently used for chemical sterilization in aseptic food processing. Due to their inherent robustness, bacterial spores, i.e. spores of Bacillus atrophaeus, are commonly employed to evaluate the efficacy of the sterilization procedure [1]. Despite its widespread use, however, the details of the sporicidal action of H2O2 are not yet fully understood, with various mechanisms being discussed in the literature [2,3]. Here, we employ optical trapping Raman microscopy to elucidate the sporicidal mechanism of H2O2. Optical trapping Raman microscopy allows us to isolate, investigate, and manipulate individual spores from a sample (Fig. 1A). Combining optical microscopy with the real-time, label-free chemical information obtained from Raman spectroscopy directly reveals the sequence of steps that lead to oxidative spore death after H2O2 exposure (Fig. 1B).
We find that spore degradation begins with the fast, cooperative release of dipicolinic acid (DPA), a key spore biomarker and a major component of spore’s core. This indicates a breach of the inner membrane surrounding the core. The onset of DPA release depends on the concentration of H2O2. DPA outflux is accompanied by the formation of oxidation products (mostly carbonyl compounds) and oxidation continues after exchange of DPA with the surrounding medium is complete. The remaining spore shell then slowly disintegrates and continues to shrink on a timescale of hundreds of seconds. Simultaneous observation of spore morphology and size by optical microscopy and particle tracking corroborates this three-step mechanism.
The presented assay allows on-line monitoring of spore composition and morphology, which directly reveals the mechanism underlying the sporicidal action of H2O2. In addition, trapped spores can be exposed to different chemical or physical stimuli (temperature, light, chemical composition of the surrounding medium, etc.) to investigate a variety of industrially relevant sterilization conditions.

Jildeh, Z. B., Wagner, P. H. & Schöning, M. J. Sterilization of Objects, Products, and Packaging Surfaces and Their Characterization in Different Fields of Industry: The Status in 2020. physica status solidi (a)
218, 2000732 (2021).

Setlow, P. & Christie, G. What’s new and notable in bacterial spore killing. World J Microbiol Biotechnol
37, 144 (2021).

Setlow, P. Spores of Bacillus subtilis: their resistance to and killing by radiation, heat and chemicals. J Appl Microbiol

101, 514-525 (2006).

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(Invited) Micro-Enabled Technologies for Next-Generation Health Monitoring
Authors: Zheng Hanjia , GhavamiNejad Amin , GhavamiNejad Peyman , Odinotski Sarah , Poudineh Mahla 
Published: November 2022

To enable personalized and precision medicine, it is crucial to monitor patient health status and bring information on disease-related agents and therapeutic drug molecules into the clinic. This requires new technologies to interrogate different body fluids that are rich sources of biomarkers, such as whole blood and interstitial fluid (ISF). Such technologies enable rapid, sensitive and - ultimately - real-time and continuous analysis of the clinically important biomarkers. Biophysics, materials chemistry and polymer and molecular engineering, as well as micro and nanofabrication, are crucial tools in this endeavor.
At IDEATION Lab, we apply innovative engineering solutions to advance patient health monitoring using two main technologies: Microneedles and Microfluidics. In the first part of my talk, I will present our new transdermal biosensing technologies powered by engineered hydrogel microneedles (HMNs), aptamer probes, and in-situ metallic nanoparticle synthesis for minimally invasive, on-needle, and real-time measurement of clinically important biomarkers in ISF. Our HMN assays expect to pave the way for the next-generation of polymeric-based wearable biosensors. In the second part, I will discuss a real-time biosensor driven by microfluidic techniques that continuously updates specific biomolecules’ fluctuating concentration levels with picomolar sensitivity directly in whole blood. For the first time, our microfluidic assay enables measuring the dynamic changes in blood insulin which is an important knowledge gap in diabetes management.
The new advances reported in this talk, enrich the level of information that can be collected from different body fluids, and provide new means and potentials for highly accurate patient health status monitoring, thus transforming the field of personalized and precision medicine.
Atomic Layer Deposition on an Optical Fibre: Enhancing the Evanescent Field of a Tilted Fibre Bragg Grating Optical Sensor
Authors: Barry Sean , Albert Jacques , Mandia David , Zhou Wenjun 
Published: November 2022

Tilted fibre Bragg gratings (TFBGs) are a class of optical fibre based sensor that are presently employed for temperature and pressure detection in transportation, building, and other infrastructure applications. The working principle of these sensors is that a Bragg grating in the core both diffracts light modes to the surface of the fibre, and breaks their symmetry. This produces very surface-sensitive modes that can interact with the fibre surface.
Our discovery of several gold metal deposition processes has permitted the coating of a TFBG with gold: this allows a surface plasmon resonance (SPR) to exist in the gold, and can sense the surface in two important ways: firstly, the shift from a localised plasmon in gold nanoparticles to a continuous plasmon in a closed metal film allows the detection of the thinnest conductive layer of gold. Gold metal grown by atomic layer deposition (ALD) using (Me3P) Me3Au(III) has a growth per cycle of 0.50 Å with oxygen plasma and water as co-precursors. The fibre sensor showed that a continuous plasmon formed at 84 ALD cycles, suggesting that the thinnest optically conductive film of gold metal formed at 4.2 nm (which is demonstrably better than a sputtered film, which showed this shift at 6.5 nm).
This ALD gold coated fibre also showed significant sensitivity to the surrounding refractive index (SRI). The SPR can reach several nanometers into the space surrounding the fibre, and the SRI can invoke a shift in the wavelength of the cladding mode. With an ALD grown stack of 50 nm Al2O3/50 nm Au0, the SPR was 150% more sensitive to an external refractive index, and the nature of the surroundings could be interrogated through changing the polarization of the affected modes.
This contribution will discuss the two aspects of sensing that a TFBG can provide, and show the effect of alumina, gold, and an alumina/gold stack on the extent and sensitivity of the SPR.
Anodic Aluminum Oxide(AAO)-Based Chemi-Capacitive Sensor Toward Ethanol Gas
Authors: Lim Gi hwan , Kim In Yea , Kim Chae Yoon , Lee Min-Jeong , Kim Jaehun , Kim Dong Hyun , Lim Jae-Hong 
Published: November 2022

The transducer elements for such sensor arrays need to be small, low-power, and compatible with conventional microprocessing technology. The transducers include chemiresistive gas sensor, FET gas sensor, capacitive gas sensor, and inductive gas sensor. Of these transducers, chemicapacitors and chemiresistors are the best suited for low-power sensor arrays. The change of electrical properties such as conductance or capacitance upon exposure to analytes can be used to detect chemical and biological agents, respectively. Chemiresistors are simply implemented in many application fields, but they have disadvantages such as instability and cross sensitivity. Whereas chemicapacitors are known to provide superior sensitivity and recovery time because capacitance can response to very thin layers of chemoselective material down to a single molecular monolayer, resulting in the elimination of the duration time for capacitance change. In this work, the room-temperature capacitive ethanol gas sensing properties of AAO (anodic aluminum oxide) were studied and the underlying mechanisms were analyzed based on its electrode configuration and detection frequency. Figure 1 shows the progress of the experimental progress according to each electrode patterns and thicknesses.
The sensor sensitivity of the chemocapacitive sensor toward ethanol was affected by the humidity because it has higher dielectric constant than ethanol. Therefore, the surface treatment of AAO was carried out by silanization using APTES and HMDS. The degree of hydrophobicity of AAO surface was determined by measuring the water contact angle by the Sessile Drop method. After surface treatment was performed in each method, the sensitivity of the sensor to the wet air was also measured.
Through silanization, similar sensor sensitivity to ethanol was obtained, and at the same time, sensor sensitivity to wet air was minimized as illustrated in Figure 2. In this study, the sensor characteristics were optimized by the electrode pattern and thickness, and the gas selectivity of the sensor was improved through surface treatment.

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How Emerging Sensor Technologies Contribute to Artificial Intelligence; Machine Learning and Deep Learning Data Acquisition Techniques
Authors: Sabar Mishes Fwangshak Sabar Mishes 
Published: November 2022

Computers Munge on Data and Without data to munge computers can as well be famished; to say literally.
Deep Learning as an off-shoot of Machine Learning which itself is a sub-field of Artificial Intelligence relies solely on advancements in emerging computing Technologies which provide the computing capacity for running large scale data processing ; most importantly these include (i.e. but not limited to)advanced high level computing power and myriad data acquisition Sources as the ubiquitous Sensors proliferating the technology space of portable computing devices and IoT.
Sensors Technology help in data collection in several be-spoke ways for these emerging computing technologies(since without data computers are famished typically and with deep learning sufficient data is basically needed)to be able to perform deep learning operations required for inferencing useful informative insights from crude-data.
Today data is being generated in an unprecedented manner, as a result of the emergence of several sensor technologies; this has become the leverage for all deep learning computations and its successes today.
In this Paper review i will be overviewing and discussing how these emerging sensors technology has been able to complement the computing power today to facilitate deep Learning technologies.
Practical Strategies for Longitudinal in-Home Sleep Tracking in Diverse Populations
Authors: Andrew Trisha L. 
Published: November 2022

Longitudinal monitoring of sleep metrics, night-to-night sleep quality, and weekly sleep patterns is important for enabling healthy aging and, more importantly, understanding and mitigating cognitive decline with aging. Recent work has shown that longitudinal changes in selected sleep metrics, such as total sleep time, time in the rapid eye movement (REM) versus non-REM sleep phases, and non-REM slow wave activity, is closely correlated with decline in cognitive function in older populations. Further, evidence also suggests that sleep disturbance in middle-aged and older populations can contribute to cognitive decline and heighten the risk of Alzheimer's Disease (AD) by increasing beta-amyloid burden. In older, at-risk populations, persistent sleep disturbances and/or shifts in sleep patterns also precede an AD diagnosis and may even appear years before cognitive decline, indicating that clinically-accurate, longitudinal sleep tracking can allow for on-time therapeutics and interventions before onset of AD symptoms.
However, clinical-grade wearable sleep monitoring is a challenging problem since it requires simultaneous monitoring of brain activity, eye movement, muscle activity, cardio-respiratory features, and gross body movements. This requires multiple sensors to be worn at different locations as well as uncomfortable adhesives and discrete electronic components to be placed on the head. As a result, existing wearables either compromise comfort or compromise accuracy in tracking sleep variables.
I will describe our lab's recent work in developing a suite of fabric-based sensors and garment-integrated sensing systems for in-home sleep tracking, focusing particularly on our efforts at enabling clinically-accurate sleep phase recognition. Our best-performing solution is PhyMask, an all-textile sleep monitoring solution that is practical and comfortable for continuous use and that acquires all signals of interest to sleep solely using comfortable textile sensors placed on the head. We show that PhyMask can be used to accurately measure all the signals required for precise sleep stage tracking and to extract advanced sleep markers such as spindles and K-complexes robustly in the real-world setting. We validate PhyMask against polysomnography and show that it significantly outperforms other commercially-available sleep tracking wearables, including the Fitbit wristband, the Oura Ring, and the Muse, Phillips SmartSleep and Dreem headbands.

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