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A method for detecting metal ions in solution using perovskite nanocrystal-based metal ion sensors

A technology of metal ions and nanocrystals, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of professional operation, lack of effective detection, wide detection range, etc., and achieve low price, wide detection range and low detection limit Effect

Active Publication Date: 2020-08-21
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these techniques have high sensitivity and strong specificity, there are requirements such as complicated sample pretreatment, high instrument cost and professional operation, which are limited in the field detection of metal ions.
Metal ion sensors based on nanocrystals / quantum dots have obvious advantages in these aspects, but at the same time, there are still many challenges in using the fluorescence properties of nanocrystals to detect metal ions. Materials and methods with low sensitivity and high sensitivity; the detection of metal ions by existing nanocrystals is usually carried out in the aqueous phase, but there is a lack of effective detection of metal ions in organic phase solutions, especially non-polar organic solvents

Method used

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  • A method for detecting metal ions in solution using perovskite nanocrystal-based metal ion sensors
  • A method for detecting metal ions in solution using perovskite nanocrystal-based metal ion sensors
  • A method for detecting metal ions in solution using perovskite nanocrystal-based metal ion sensors

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Embodiment 1

[0026] (1) CsPbX 3 -R(X=Br - , I - , Cl - or Br - / I - , Cl - / Br - Mixed halide ions; R is oleic acid and oleylamine, etc.) Preparation of perovskite nanocrystals: The preparation reaction is carried out in a Schlenk line reactor. Weigh 163mg Cs 2 CO 3 In a 100ml three-necked flask, add 8ml octadecene and 0.5ml oleic acid to it, vacuumize at 120°C for 1h under magnetic stirring conditions, until all Cs 2 CO 3 Both react with oleic acid to obtain cesium oleate precursor. Add 0.188mmol PbX to a 50ml three-necked flask equipped with a thermocouple and a condenser 2 (X=Br - , I - , Cl - or Br - / I - , Cl - / Br -Mix halide ions), 5ml octadecene, 0.5ml oleic acid and 0.5ml oleylamine, set the program temperature control, make the reaction system warm up to 120°C for 10min under magnetic stirring and keep 120°C for 1h and vacuumize. Then, under the protection of argon, the temperature was raised to 150°C within 3 minutes, and 0.4ml of the cesium oleate precursor s...

Embodiment 2

[0032] In embodiment 1, other conditions are constant, and in (5), the solution sample to be measured is changed into the automobile lubricating oil before use and after use, and it is found that copper ion content is lower in the automobile lubricating oil before use, and CsPbBr 3 The fluorescence intensity of nanocrystals only decreased slightly; while the content of copper ions in the used automotive lubricating oil was relatively high, the effect on CsPbBr 3 Nanocrystalline fluorescence has a significant quenching effect. The detection results are in good agreement with the copper ion concentration measured by inductively coupled plasma mass spectrometry.

Embodiment 3

[0034] In embodiment 1 (1) and (2) condition is constant, and metal ion is changed into Yb in (3) 3+ , available via Yb 3+ Enhanced effect on fluorescence on Yb 3+ The concentration of ions was detected.

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Abstract

The invention discloses a method for detecting metal ions in a solution by a perovskite nanocrystal based metal ion sensor. The metal ion sensor contains a perovskite nanocrystal with structure as shown in the general formula ABX3, wherein A is cesium ion Cs <+>, B is lead ion Pb<2+>, X is one or more of halogen ions Cl<->, Br<-> and I<->, and detectable metal ions comprise but are not limited to metal ions such as Cu<2+>, Yb<3+> and the like. A solution containing to-be-measured ions is added to a perovskite nanocrystal solution, the concentration of the to-be-measured ions is calculated by measuring change of fluorescence intensity of the perovskite nanocrystal under the excitation of light. The sensor has the advantages of high sensitivity, high selectivity, low detection limit, high response speed, low price, wide detection range, mild test conditions (detection at room temperature), good reproducibility and the like, is easy to operate, and has broad application prospect in field of metal ion detection for environment, industry and food.

Description

technical field [0001] The invention relates to a method for detecting metal ions in a solution using a metal ion sensor based on perovskite nanocrystals, specifically referring to detecting metal ions and determining their concentration through the quenching or enhancing effect of metal ions on the fluorescence of perovskite nanocrystals . Background technique [0002] Metal ions widely exist in biological systems and have an important impact on human health. For example, the metal ion Pb 2+ , Hg 2+ and Cd 2+ It is not an essential component for biological survival and is harmful to human health even at very low concentrations; while metal ions such as Fe 3+ , Cu 2+ , Mn 2+ and Zn 2+ It is positive for maintaining health. Due to the importance of metal ions in life science and environmental science, it is more and more important to develop metal ion detection methods with high sensitivity. So far, many ion probes based on organic dyes have been developed for the det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 徐翔星盛雪曦包建春
Owner NANJING NORMAL UNIVERSITY
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