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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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A freestanding all-solid-state polymeric membrane Cu2+-selective electrode based on three-dimensional graphene

Jinghui Li1, Wei Qin2

  • 1Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Provincial Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong, 264003, PR China; University of the Chinese Academy of Sciences, Beijing, 100049, PR China.

Analytica Chimica Acta
|May 11, 2019
PubMed
Summary

A novel three-dimensional graphene sponge (3D GS) electrode enables a highly sensitive and stable all-solid-state copper ion-selective electrode (Cu2+-ISE). This advancement offers reliable copper ion detection with minimal interference.

Keywords:
All-solid-state ion-selective electrodeCopperFreestanding electrodeSolid contactThree-dimensional graphene sponge

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sensor Technology

Background:

  • Development of robust and sensitive ion-selective electrodes is crucial for environmental and biological monitoring.
  • Traditional electrodes often face challenges with stability, water layer formation, and interference.

Purpose of the Study:

  • To propose a novel freestanding all-solid-state polymeric membrane copper ion-selective electrode (Cu2+-ISE).
  • To utilize three-dimensional graphene sponge (3D GS) as a superior electrode substrate and solid contact material.

Main Methods:

  • Fabrication of a Cu2+-ISE using 3D graphene sponge as the electrode substrate and solid contact.
  • Characterization of the 3D GS electrode using cyclic voltammetry, electrochemical impedance spectroscopy, and contact angle measurements.
  • Evaluation of the Cu2+-ISE performance, including Nernstian response, detection limit, and interference studies.

Main Results:

  • 3D graphene sponge exhibits high electrical double layer capacitance, good conductivity, and hydrophobicity.
  • The 3D GS-based Cu2+-ISE demonstrates a wide Nernstian response range (1.0 × 10-8 to 7.9 × 10-4 M) with a low detection limit (2.5 × 10-9 M).
  • The electrode shows stable potential response, reduced water layer formation, and immunity to light, O2, and CO2 interferences.

Conclusions:

  • Three-dimensional graphene sponge is an effective material for constructing high-performance all-solid-state Cu2+-ISEs.
  • The proposed electrode offers enhanced sensitivity, stability, and resistance to common interferences, paving the way for improved copper ion sensing applications.