Membraneless all-solid-state ion selective electrode as well as preparation method and application thereof

An ion-selective, all-solid-state technology, applied in the field of electrochemistry, can solve the problems of ISM components leaking into the analysis solution, high cost, poor mechanical strength, etc., and achieve excellent stability and Nernst response, excellent Lithium ion selectivity, effect of increasing mechanical properties

Pending Publication Date: 2021-01-29
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional detection methods require complex pretreatment procedures, and there are problems of high pollution and high energy consumption, while SC-ISEs are used in Li + The field of concentration detection has attracted attention
However, the current mainstream SC-ISEs have a series of disadvantages: (1) The mechanical strength of the ISM is poor, and the ISM may fall off or be damaged during long-term use; (2) The components of the ISM may leak into the analysis solution; ( 3) ISM has poor biocompatibility. When applied to flexible wearable analysis sensors (such as online analysis of human sweat ions), the material will directly contact the skin, resulting in toxicity risks; (4) It is easy to appear between the ISM and the solid-state transfer layer The water layer reduces the stability of the potential; (5) ISM components contain very expensive ionophores, making the cost high
Therefore, the construction of a stable and reproducible new-generation all-solid-state ion-selective electrode is currently facing great challenges.

Method used

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  • Membraneless all-solid-state ion selective electrode as well as preparation method and application thereof
  • Membraneless all-solid-state ion selective electrode as well as preparation method and application thereof
  • Membraneless all-solid-state ion selective electrode as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] A membraneless all-solid-state ion-selective electrode, the preparation method of which is:

[0026] The glassy carbon electrode is first made of 0.3μm Al 2 o 3 The polishing powder is polished on a nylon cloth, and after cleaning, use 0.05μm Al 2 o 3 Polish with polishing powder, wash with water and ethanol several times at the end, and set aside.

[0027] LiFePO 4 The powder was ground in a mortar for 3 minutes, then dispersed in NMP solution with PVDF at a mass ratio of 8:2, and ultrasonically dispersed for 2 hours to obtain LiFePO 4 A dispersion with a concentration of 70 mg / ml.

[0028] Take 10 μL of dispersion liquid and apply it on the treated glassy carbon electrode, LiFePO 4 The load on the glassy carbon electrode is about 0.3 mg cm -2 . Finally, it was dried in an oven at 60°C for 2 hours to obtain a membraneless all-solid-state ion-selective electrode, which was labeled as a GCE / LFP electrode.

Embodiment 2

[0030] This embodiment provides a membraneless all-solid-state ion-selective electrode, the only difference between its preparation method and embodiment 1 is that LiFePO 4 Replaced by LiMn of equal mass 2 o 4 (LMO), and the obtained membraneless all-solid-state ion-selective electrode is labeled as GCE / LMO electrode.

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Abstract

The invention discloses a membraneless all-solid-state ion selective electrode and a preparation method and application thereof. The membraneless all-solid-state ion selective electrode is composed ofan electrode substrate and a lithium ion positive electrode material loaded on the electrode substrate. The lithium ion positive electrode material is selected from at least one of lithium iron phosphate and lithium manganate. The membraneless all-solid-state ion selective electrode shows excellent lithium ion selectivity, potential long-term stability and detection limit, and also shows excellent stability and Nernst response in artificial plasma detection. As no ion selective membrane is contained, the mechanical property of the electrode is improved, and the method is suitable for preparing a microminiaturized electrode and is high in feasibility; the raw materials are easy to prepare, can be produced in batch and are very suitable for industrial application to clinical diagnosis.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a membraneless all-solid-state ion-selective electrode and its preparation method and application. Background technique [0002] With the advancement of science and technology and the rapid development of the economy, people's demand for personal health and health monitoring systems is increasing, which makes researchers pay more attention to the design and development of new sensor devices. Electrochemical sensors have broad application prospects because of their portability, high sensitivity, low energy consumption, and high monitoring efficiency. Among them, potentiometric sensors, especially ion-selective electrodes (ISEs), are one of the most attractive electrochemical sensors. [0003] In recent years, all-solid-state ion-selective electrodes (SC-ISEs) have attracted widespread attention in the field of clinical analysis. They have the advantages of easy miniaturization, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
CPCG01N27/333
Inventor 牛利甘世宇吕妍钟丽杰
Owner GUANGZHOU UNIVERSITY
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