Single tungsten nanowires as pH sensitive electrodes

Fenster, Christian; Sutherland-Smith, Andrew J.; Abts, André; Milenković, Srdjan; Hassel, Achim Walter

doi:10.1016/j.elecom.2008.05.008

Cited by 46 publications

(40 citation statements)

References 19 publications

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“…6.4 pH sensor Tip structures such as those described in the previous section were employed as pH sensors as well [72]. The stick-shaped samples were dipped into an electrolyte and processed according to the procedure described in Ref.…”

Section: Superhydrophobicitymentioning

confidence: 99%

Preparation and specific properties of single crystalline metallic nanowires

Hassel

Bello-Rodriguez

Sutherland-Smith

et al. 2010

Physica Status Solidi (b)

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Directional solidification of eutectics is a route to produce isooriented metallic single crystalline nanowires (NWs). Etching or electrochemical oxidation allows selective dissolution of either of the phases to produce NW arrays, isolated NWs, nanopore arrays and also derived structures by combining various process steps. A good understanding of the thermodynamics and the kinetics of the phase transformation and chemical reactions including electrodissolution, passivation, selective etching, complexing of reaction products and electrodeposition in the systems NiAl-X (X ¼ Re, W, Mo), Ag-Cu and Fe-Au was reached. Functional devices based on these NWs, like high aspect ratio NW based STM tips, nanoelectromechanical systems (NEMS), NW pH sensors and sensor arrays were constructed.Array of rhenium single crystalline NWs embedded in the NiAl matrix after partial dissolution of the matrix.

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Section: Superhydrophobicitymentioning

confidence: 99%

Preparation and specific properties of single crystalline metallic nanowires

Hassel

Bello-Rodriguez

Sutherland-Smith

et al. 2010

Physica Status Solidi (b)

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“…fL) and temporal resolution (ca. [4c] Many attempts aimed to circumvent this critical issue rely on electroactive materials confined in nano-etched cavities at the tip of glass nanocapillaries, [4c] etched carbon wires [3, 4d] or nanotubes (NTs), [7] nanowires (NWs) of noble metals [8] or tungsten [9] as well as core-shell NTs. [1] Hence, nanoelectrodes have been designed for investigating many subcellular questions such as mapping exocytotic hot spots on plasma membranes, [2] single synapse behavior, [3] and monitor-ing intracellular events.…”

mentioning

confidence: 99%

“…[1] Hence, nanoelectrodes have been designed for investigating many subcellular questions such as mapping exocytotic hot spots on plasma membranes, [2] single synapse behavior, [3] and monitor-ing intracellular events. [4c] Many attempts aimed to circumvent this critical issue rely on electroactive materials confined in nano-etched cavities at the tip of glass nanocapillaries, [4c] etched carbon wires [3, 4d] or nanotubes (NTs), [7] nanowires (NWs) of noble metals [8] or tungsten [9] as well as core-shell NTs. However,s uch designs present severe limitations such as difficulties in allowing further modification [4c] or achieving high aspect ratio shafts because of the mechanical fragility of electroactive materials with nano-sized cross-sections.…”

mentioning

confidence: 99%

Real‐Time Intracellular Measurements of ROS and RNS in Living Cells with Single Core–Shell Nanowire Electrodes

et al. 2017

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Nanoelectrodes allowp recise and quantitative measurements of important biological processes at the single living-cell level in real time.C ylindrical nanowire electrodes (NWEs) required for intracellular measurements create agreat challenge for achieving excellent electrochemical and mechanical performances.H erein, we present af acile and robust solution to this problem based on au nique SiC-core-shell design to produce cylindrical NWEs with superior mechanical toughness provided by the SiC nano-core and an excellent electrochemical performance provided by the ultrathin carbon shell that can be used as such or platinized. The use of such NWEs for biological applications is illustrated by the first quantitative measurements of ROS/RNS in individual phagolysosomes of living macrophages.Asthe shell material can be varied to meet any specific detection purpose,this work opens up new opportunities to monitor quantitatively biological functions occurring inside cells and their organelles.Numerous fundamental biological processes occur in subcellular locations and inside intracellular organelles.H ence, there is increased interest for monitoring and quantifying such processes in real time.I nt his respect, nanoelectrodes have many unique advantages in terms of selectivity and sensitivity.Quantitative detection of biochemical signals with very high spatial (ca. fL) and temporal resolution (ca. ms-ms) may report about only af ew thousand molecules with minimal invasion while maintaining cell viability. [1] Hence, nanoelectrodes have been designed for investigating many subcellular questions such as mapping exocytotic hot spots on plasma membranes, [2] single synapse behavior, [3] and monitor-ing intracellular events. [4] However,t he shapes of such nanoelectrodes mostly rely on needle-or disk-type patterns. However,s uch designs present severe limitations such as difficulties in allowing further modification [4c] or achieving high aspect ratio shafts because of the mechanical fragility of electroactive materials with nano-sized cross-sections. [1b,4c, 5] Nanoelectrodes with conical shafts [6] are more robust but cannot be inserted deep inside cells without damaging the cytoplasmic membrane and the intracellular regions crossed over by the electrode tip.N anoelectrodes with near-cylindrical shafts produce minimal perturbations and reseal the cell membrane around the shaft to maintain the cell homeostasis during measurements. [4c] Many attempts aimed to circumvent this critical issue rely on electroactive materials confined in nano-etched cavities at the tip of glass nanocapillaries, [4c] etched carbon wires [3, 4d] or nanotubes (NTs), [7] nanowires (NWs) of noble metals [8] or tungsten [9] as well as core-shell NTs. [10] However, such NWs or NTs usually lack sufficient mechanical robustness to allow the routine fabrication of electrodes apt to be inserted into cells.Producing single NW/NTelectrodes (NWEs/NTEs) with high electrochemical and mechanical performances for intracellular detection with minimal damage...

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“…Keberhasilan penggunaan tungsten oksida sebagai elektroda selektif pH yang dilakukan oleh Fenster et al (2008) …”

Section: Pendahuluanunclassified

Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

2018

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ABSTRAKPenggunaan tungsten oksida sebagai elektroda untuk mendeteksi keberadaan asam aspartat, glutamat dan arginin dalam larutan secara potensiometri dilakukan dalam sistem batch. Karakterisasi elektroda tungsten oksida yang digunakan meliputi rentang linier, limit deteksi, sensitivitas dan reprodusibilitas. Pengaruh jenis buffer dan konsentrasinya dalam analisis juga dipelajari untuk mengoptimasi hasil pengukuran. Dari hasil penelitian, diperoleh kondisi optimum untuk mendeteksi arginin adalah pada buffer fosfat pH 6,0 dengan konsentrasi 0,5 x 10 -3 M. Koefisien korelasi diperoleh sebesar 0,9864, limit deteksi 5,24 x 10 -6 M, sensitivitas 16,1 mV/dekade dengan reprodusibilitas 0 -7 %. Asam glutamat memiliki koefisien korelasi 0,9789, limit deteksi 3,80 x 10 -6 M, sensitivitas 9,2 mV/dekade dan reprodusibilitas 0 -6 %. Asam aspartat memiliki koefisien korelasi 0,9949, limit deteksi 7,76 x 10 -6 M, sensitivitas 13,4 mV/dekade dan reprodusibilitas 0 -5 %.Kata kunci: asam amino, batch, potensiometri, tungsten oksida ABSTRACTThe presence of aspartic acid, glutamic acid and arginine in solution can be detected by potentiometric method using tungsten oxide electrode in a batch system. Characterization of tungsten oxide electrode used include linear range, limit of detection, sensitivity and reproducibility. Buffer type and concentration effect also studied to optimize the measurement results. Optimum conditions for detecting arginine was at pH 6.0 with a phosphate buffer concentration of 0.5 x 10 -3 M. Correlation coefficient was obtained for 0.9864, the detection limit of 5.24 x 10 -6 M, sensitivity 16.1 mV/decade with reproducibility 0 -7 %. Glutamic acid has a correlation coefficient of 0.9789, the detection limit of 3.80 x 10 -6 M, the sensitivity of 9.2 mV/decade and reproducibility of 0 -6 %. Aspartic acid has a correlation coefficient of 0.9949, the detection limit of 7.76 x 10 -6 M, sensitivity of 13.4 mV/decade and reproducibility of 0 -5 %.

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Single tungsten nanowires as pH sensitive electrodes

Cited by 46 publications

References 19 publications

Preparation and specific properties of single crystalline metallic nanowires

Preparation and specific properties of single crystalline metallic nanowires

Real‐Time Intracellular Measurements of ROS and RNS in Living Cells with Single Core–Shell Nanowire Electrodes

Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

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