Chemical Sensors from Lead Metallophthalocyanine Whiskers

Strelcov, E.; Kolmakov, Andrei

doi:10.1109/icsens.2007.4388479

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Other recent PTIR innovations include the extension to the visible spectral range 35 and operation in a water environment. 37,38 Due to these characteristics, PTIR impacts an ever-growing number of applications including, polymer science, 39,40 photovoltaics, 41,42 plasmonics, 43,44 geology, 45 biology, 46 and medicine, 47,38,36 as discussed in recent reviews. 26,27 For 2D materials, PTIR has been applied to characterize the polariton distribution in hBN nanostructures 48,49 and to characterize the functional groups in graphene oxide.…”

Section: Resultsmentioning

confidence: 99%

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

Schwartz

Chuang

Rosenberger

et al. 2019

ACS Appl. Mater. Interfaces

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Van der Waals heterostructures (vdWHs) leverage the characteristics of two-dimensional (2D) material building blocks to create a myriad of structures with unique and desirable properties. Several commonly employed fabrication strategies rely on polymeric stamps to assemble layers of 2D materials into vertical stacks. However, the properties of such heterostructures frequently are degraded by contaminants, typically of unknown composition, trapped between the constituent layers. Such contaminants therefore impede studies of the intrinsic properties of heterostructures and hinder their application. Here, we use the photothermal induced resonance (PTIR) technique to obtain infrared spectra and maps of the contaminants down to a few attomoles and with nanoscale resolution. Heterostructures comprised of WSe 2 , WS 2 , and hBN layers were found to contain significant amounts of polydimethylsiloxane (PDMS) and polycarbonate, corresponding to the stamp materials used in their construction. Additionally, we verify that an atomic force microscope-based "nano-squeegee" technique is an effective method for locally removing contaminants by comparing spectra within as-fabricated and cleaned regions. Having identified the source of the contaminants, we demonstrate that cleaning PDMS stamps with isopropanol or toluene prior to vdWH fabrication reduces PDMS contamination within the structures. The general applicability of the PTIR technique for identifying the sources corrupting vdWHs provides *

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Section: Resultsmentioning

confidence: 99%

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

Schwartz

Chuang

Rosenberger

et al. 2019

ACS Appl. Mater. Interfaces

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“…Figure 5a,b shows the particles of complex 2 and complex 3 by scanning electron microscopy (SEM), with a whiskers-like morphology and crystal shape characteristic typical of the triclinic space group [37]. For both cases, the SEM images and the non-symmetric unimodal graphics for the dispersion of sizes, revealed that the whiskers tend to be smaller in the longitudinal direction, varying from 1.0 µm to 2 µm with a median longitudinal particle size (d 50 ) of 6.7 µm and longitudinal particle size distribution d 80 of 11.1 µm for the complex 2.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

New Mononuclear Complex of Europium(III) and Benzoic Acid: From Synthesis and Crystal Structure Solution to Luminescence Emission

et al. 2020

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This study presents a general method which can be used for the synthesis of mononuclear complexes with europium(III) and organic ligands with carboxylic groups. It describes the procedure for preparing a new mononuclear coordination complex with europium(III) and carboxylate ligands sourced from benzoic acid. The construction of mononuclear complexes with a coordination sphere saturated in carboxylic ligands must go through the preparation and purification of a europium(III) intermediate complex that presents a coordination sphere with anions that will be later exchanged for carboxylic groups and finally precipitated as a solvent-free or anion-free complex within the coordination sphere. The detailed synthesis procedure for powders of a new complex, as well as studies of its structural composition at each phase and luminescent properties, are detailed in this study. Analytical and spectroscopic data reveal the formation of a new mononuclear complex of the general formula [Eu(OOCC6H5)3·(HOOCC6H5)2]. The crystal structure of the Eu(III) complex was solved using X-ray powder diffraction data and EXPO2014 software, and the crystal structure result was deposited in the CCDC service with number 19771999.

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“…Improved understanding of ionic transport and reactions will impact the work not only on traditional lithium ion batteries but also the broader space of electrochemically active systems including fuel cells 2 and resistive switching devices. 3,4 In recent years, several techniques for studying electrochemical systems at the nanoscale have been developed using scanning-probe microscopy (SPM) tip-based methods [5][6][7][8][9][10][11] and electron microscopy based techniques. [12][13][14][15][16][17] These techniques have been used to explore nanoscale electrochemistry by driving reactions through nanostructures or through use of SPM conductive tips as electrodes.…”

mentioning

confidence: 99%

“…3,4 In recent years, several techniques for studying electrochemical systems at the nanoscale have been developed using scanning-probe microscopy (SPM) tip-based methods [5][6][7][8][9][10][11] and electron microscopy based techniques. [12][13][14][15][16][17] These techniques have been used to explore nanoscale electrochemistry by driving reactions through nanostructures or through use of SPM conductive tips as electrodes. In the lithium-silicon system, this approach has enabled the observation of atomically-thin lithiation phase fronts and detailed studies of phase-front dynamics under strain.…”

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confidence: 99%

Direct-Write Lithiation of Silicon Using a Focused Ion Beam of Li⁺

et al. 2019

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Electrochemical processes that govern the performance of lithium ion batteries involve numerous parallel reactions and interfacial phenomena that complicate the microscopic understanding of these systems. To study the behavior of ion transport and reaction in these applications, we report the use of a focused ion beam of Li + to locally insert controlled quantities of lithium with high spatial-resolution into electrochemically relevant materials in vacuo. To benchmark the technique, we present results on direct-write lithiation of 35 nm thick crystalline silicon membranes using a 2 keV beam of Li + at doses up to 10 18 cm −2 (10 4 nm −2). We confirm quantitative sub-μm control of lithium insertion and characterize the concomitant morphological, structural and functional changes of the system using a combination of electron and scanning probe microscopy. We observe saturation of interstitial lithium in the silicon membrane at ≈ 10 % dopant number density and spillover of excess lithium onto the membrane's surface. The implanted Li + is demonstrated to remain electrochemically active. This technique will enable controlled studies and improve understanding of Li + ion interaction with local defect structures and interfaces in electrode and solid-electrolyte materials.

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Chemical Sensors from Lead Metallophthalocyanine Whiskers

Cited by 3 publications

References 10 publications

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

New Mononuclear Complex of Europium(III) and Benzoic Acid: From Synthesis and Crystal Structure Solution to Luminescence Emission

Direct-Write Lithiation of Silicon Using a Focused Ion Beam of Li⁺

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Chemical Sensors from Lead Metallophthalocyanine Whiskers

Cited by 3 publications

References 10 publications

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

New Mononuclear Complex of Europium(III) and Benzoic Acid: From Synthesis and Crystal Structure Solution to Luminescence Emission

Direct-Write Lithiation of Silicon Using a Focused Ion Beam of Li+

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Product

Resources

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Direct-Write Lithiation of Silicon Using a Focused Ion Beam of Li⁺