CN107817287A - A kind of sensor of detection nitrogen oxides based on nano graphene oxide and preparation method thereof - Google Patents
A kind of sensor of detection nitrogen oxides based on nano graphene oxide and preparation method thereof Download PDFInfo
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- CN107817287A CN107817287A CN201711037602.4A CN201711037602A CN107817287A CN 107817287 A CN107817287 A CN 107817287A CN 201711037602 A CN201711037602 A CN 201711037602A CN 107817287 A CN107817287 A CN 107817287A
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Abstract
The invention discloses a kind of sensor of detection nitrogen oxides based on nano graphene oxide and preparation method thereof.The present invention is first by palladium electrode H2SO4Cyclic voltammetry scan (pretreatment) several times, then is washed with deionized；Then nano graphene oxide polypyrrole is connected on clean palladium electrode, is concretely comprised the following steps：Pyrrole polymerization forms the film of polypyrrole first on palladium electrode, then in an inert atmosphere, chromium solution is aoxidized in Klorvess Liquid, circulation is several times；The solution of nano graphene oxide is dripped to the palladium electrode surface of polypyrrole modifying again, NGSO PPy nano-complexes are formed after ethanol evaporation；Finally using potassium chloride as support electrode, copper nano-particle CuNP is deposited on NGSO PPy Pd electrodes, forms electrode sensor.Electrode sensor detects nitrogen oxides high sensitivity, and shows extraordinary repeatable and stability.
Description
Technical field
The present invention relates to electrochemical sensor technology field, more particularly to a kind of detection nitrogen based on nano graphene oxide
Sensor of oxide and preparation method thereof.
Background technology
NO plays very important effect in Vascular Biology and pathobiology.NO, which is that one kind is metastable, to be passed through
The gas radicals of cell membrane diffusion, have and suppress platelet aggregation, suppress smooth muscle cell proliferation, regulation antiotasis, be situated between
The effects such as guided cell is immune, cell toxicant, have in angiocardiopathy such as hypertension, atherosclerosis, heart failure important
Meaning.
NO compound has two classes, and one kind is that can discharge NO or the homologue with redox, claims exogenous NO,
It discharges NO essentially from NO donors as nitroglycerin is metabolized in vivo；Another kind of is that could discharge NO after needing enzymatic
Material, referred to as endogenous NO is widely present in the various cells such as vascular endothelial cell, macrophage, by L-arginine
The nitrogen-atoms of guanidine radicals end catalyzing and synthesizing in nitricoxide synthase with molecular oxygen, building-up process are more by substrate, product feedback etc.
Kind factor regulation.
NO chemical property is very active, and half-life period only has 5~10s.NO has very strong lipophilicity, easily through biology
Film, there is high affinity with the iron ion of hemoglobin, myosin and soluble guanylate cyclase.NO is to cardiovascular system
Effect predominantly adjust antiotasis.Under normal physiological conditions, between the vaso-excitor material and vasodilator of vascular system
Dynamic equilibrium maintain the normal tension force of blood vessel, blood pulsatile flow and blood are endothelial cells to the shearing force of vascular wall
Secrete basic NO important stimulus factor.
Many methods are used to detect nitrogen oxides, such as electron paramagnetic resonance, spectrophotometry de termination and chemiluminescence
Method.In all methods, the method for electrochemistry is proved to be due to simple, light, the advantages of cheap and quick analysis
A kind of very powerful method.There are some reports with the method for resistance, voltage and current to detect nitrogen oxides.Recently,
ZnO-In2O3 films are widely used for detecting oxides of nitrogen gas.But corresponding sensor but without high sensitivity and
It uses the very high temperature (200-500 DEG C) of needs.
Nano graphene oxide (NGO) has been widely used in sensor, because the chemistry that they have had is steady
Qualitative, outstanding electronics and mechanical property.These special properties cause nano graphene oxide to can be good at as inorganic
The support of nano material, such as can be as the copper nano particles (CuNP) of electrochemical sensor.Nano graphene oxide has
High electrical conductivity and big surface area, therefore the performance of copper nano particles can be promoted.Directly copper nano particles are prepared into and received
It is exactly the performance for maintaining nanocrystal and nano graphene oxide itself to have the advantages of individual very big on rice graphene oxide.
The content of the invention
For overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of inspection based on nano graphene oxide
Survey sensor of nitrogen oxides and preparation method thereof.Preparation method of the present invention is simple, obtained sensor detection NO high sensitivities,
Testing result is accurate.
Technical scheme is specifically described as follows.
The present invention provides a kind of preparation method of the sensor of the detection nitrogen oxides based on nano graphene oxide, specifically
Step is as follows：
(1) potential range is set as 0~1.2V, in an inert atmosphere, in 0.14~0.18mol/L Klorvess Liquid
0.4~0.8mol/L chromium solution is aoxidized, circulation is carried out 10~14 times, by polypyrrole modifying to pretreated palladium electrode
On；
(2) solution of nano graphene oxide is dripped to the palladium electrode surface of polypyrrole modifying, evaporation forms NGO-PPy-
Pt electrodes；
(3) using 0.14~0.18mol/L potassium chloride as support electrode, potential range is set as -0.4~+1.2V, with
0.1~0.3mol/L CuCl2As copper raw material, copper nano-particle CuNP is deposited into NGO- using the method for electrochemical deposition
On PPy-Pt electrodes, the sensor of the detection nitrogen oxides based on nano graphene oxide is formed.
In the present invention, in step (1), palladium electrode with aluminium powder before use, first polished, afterwards 0.5~1.2mol/L's
H2SO4In, cyclic voltammetry scan 10~14 times in the range of being -0.3~+1.72V in scanning potential.
In the present invention, in step (2), the solution of nano graphene oxide for 2mg NGSO and 1~2ml 0.3~
0.6wt%nafion ethanol solution.
In the present invention, in step (2), a diameter of 25~50nm of nano graphene oxide.
The present invention also provides a kind of biography for the detection nitrogen oxides based on graphene oxide that above-mentioned preparation method obtains
Sensor.
Compared to the prior art, the beneficial effects of the present invention are：
What the present invention designed detects NO high sensitivities based on CuNP-NGSO-PPy-Pd electrode sensors, and test limit is low；Pass
Sensor shows extraordinary repeatability energy and stability.
Embodiment
In order to deepen the understanding of the present invention, with reference to implementing, the invention will be further described.
Embodiment 1
A kind of preparation method of the sensor of the detection nitrogen oxides based on nano graphene oxide, its step are as follows：
(1) before the experiments, a diameter of 0.5mm palladium electrode is first polished with aluminium powder, be then washed twice with deionized water；
The palladium electrode 1.2mol/L of wash clean H2SO412 times are pre-processed in the range of being -0.3~+1.72V in scanning potential, then
It is washed with deionized；Same pretreatment will be carried out before the electrochemical polymerization reaction of pyrroles is carried out every time；
(2) nano graphene oxide-polypyrrole is connected on palladium electrode, first, pyrrole polymerization forms poly- on palladium electrode
The film of pyrroles：Potential range is set as 0~1.2V (using Ag/AgCl electrodes as reference), under argon atmosphere, in 0.16mol/L
Klorvess Liquid in aoxidize 0.6mol/L chromium solution, circulation carry out 12 times；Then, by the nanometer of diameter 25-50 nanometers
The solution of graphene oxide drips to the palladium electrode surface of polypyrrole (PPy) modification, and forming NGSO-PPy nanometers after ethanol evaporation answers
Compound；Finally using 0.16mol/L KCl as support electrode, potential range is set as -0.4~+1.2V, with 0.2mol/L's
CuCl2As copper raw material, copper nano-particle CuNP is deposited on NGSO-PPy-Pt electrodes using the method for electrochemical deposition,
Formation is based on CuNP-NGSO-PPy-Pt electrode sensors (using Ag/AgCl electrodes as reference).
Embodiment 2
A kind of preparation method of the sensor of the detection nitrogen oxides based on nano graphene oxide, its step are as follows：
(1) before the experiments, a diameter of 0.35mm palladium electrode is first polished with aluminium powder, is then washed with deionized water two
It is secondary；The palladium electrode of wash clean with 1.0mol/L HCl be -0.5~+1.48V in scanning potential in the range of pre-process 18 times, so
After be washed with deionized；Same pretreatment will be carried out before the electrochemical polymerization reaction of pyrroles is carried out every time；
(2) nano graphene oxide-polypyrrole is connected on palladium electrode, first, pyrrole polymerization forms poly- on palladium electrode
The film of pyrroles：Potential range is set as 0~1.5V (using Ag/AgCl electrodes as reference), under nitrogen atmosphere, in 0.22mol/L
Klorvess Liquid in aoxidize 0.78mol/L chromium solution, circulation carry out 18 times；Then, by the nanometer of diameter 45-75 nanometers
The solution of graphene oxide drips to the palladium electrode surface of polypyrrole modifying, and NGSO-PPy nano-complexes are formed after ethanol evaporation；
Finally using 0.22mol/L potassium chloride as support electrode, potential range is set as -0.5~+1.6V, with 0.24mol/L's
CuCl2As copper raw material, copper nano-particle CuNP is deposited on NGSO-PPy-Pt electrodes using the method for electrochemical deposition,
Formation is based on CuNP-NGSO-PPy-Pt electrode sensors (using Ag/AgCl electrodes as reference).
Embodiment 3
A kind of preparation method of the sensor of the detection nitrogen oxides based on nano graphene oxide, its step are as follows：
(1) before the experiments, a diameter of 0.75mm palladium electrode is first polished with aluminium powder, is then washed with deionized water two
It is secondary；The palladium electrode 1.4mol/L of wash clean HNO3Pre-processed 24 times in the range of being -0.15~+1.75V in scanning potential,
Then it is washed with deionized；Same pretreatment will be carried out before the electrochemical polymerization reaction of pyrroles is carried out every time；
(2) nano graphene oxide-polypyrrole is connected on palladium electrode, first, pyrrole polymerization forms poly- on palladium electrode
The film of pyrroles：Potential range is set as -0.15~1.8V (using Ag/AgCl electrodes as reference), under atmosphere of inert gases,
0.67mol/L chromium solution is aoxidized in 0.19mol/L Klorvess Liquid, circulation is carried out 24 times；Then, by diameter 35-65
The solution of the nano graphene oxide of nanometer drips to the palladium electrode surface of polypyrrole modifying, and forming NGSO-PPy after ethanol evaporation receives
Rice compound；Finally using 0.19mol/L potassium chloride as support electrode, potential range is set as -0.22~+1.8V, with
0.17mol/L CuCl2As copper raw material, copper nano-particle CuNP is deposited into NGSO- using the method for electrochemical deposition
On PPy-Pt electrodes, formation is based on CuNP-NGSO-PPy-Pt electrode sensors (using Ag/AgCl electrodes as reference).
What embodiment 1~3 designed is penetrated based on CuNP-NGSO-PPy-Pd electrode sensors with SEM and X-
Line energy spectrum analysis is characterized, and the electrochemical properties of designed electrode are studied with cyclic voltammetry, tests table
It is bright：The reversible redox peaks of copper nano particles (CuNP), the electrode pair nitrogen oxidation of design are found that in -0.15V and -0.3V
The electro-catalysis ability of compound is four times of CuNP-PPy-Pd electrodes, and testing result clearly shows that nano graphene oxide gathers
Pyrroles's nano-complex (NGSO-PPy) can promote the electron transmission between copper nano particles and palladium electrode.In addition, sensor
Show extraordinary repeatability and good stability and can be all maintained within the time of 45 days.
Claims (5)
1. a kind of preparation method of the sensor of the detection nitrogen oxides based on nano graphene oxide, it is characterised in that specific
Step is as follows：
(1) potential range is set as 0~1.2V, in an inert atmosphere, is aoxidized in 0.14~0.18mol/L Klorvess Liquid
0.4~0.8mol/L chromium solution, circulation are carried out 10~14 times, by polypyrrole PPy modifications to pretreated palladium electrode；
(2) solution of nano graphene oxide is dripped to the palladium electrode surface of polypyrrole PPy modifications, evaporation forms NGO-PPy-Pt
Electrode；
(3) using 0.14~0.18mol/L potassium chloride as support electrode, potential range is set as -0.4~+1.2V, with 0.1
~0.3mol/L CuCl2As copper raw material, copper nano-particle CuNP is deposited into NGO- using the method for electrochemical deposition
On PPy-Pt electrodes, the sensor of the detection nitrogen oxides based on nano graphene oxide is formed.
2. preparation method according to claim 1, it is characterised in that in step (1), palladium electrode is before use, first use aluminium powder
Polishing, afterwards in 0.5~1.2mol/L H2SO4In, cyclic voltammetry scan in the range of being -0.3~+1.72V in scanning potential
10~14 times.
3. preparation method according to claim 1, it is characterised in that：In step (2), the solution of nano graphene oxide is
0.3~0.6wt%nafion of 2mg NGSO and 1~2ml ethanol solution.
4. preparation method according to claim 1, it is characterised in that in step (2), nano graphene oxide it is a diameter of
25~50nm.
A kind of 5. detection nitrogen based on nano graphene oxide that preparation method according to one of Claims 1 to 4 obtains
The sensor of oxide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632160A (en) * | 2019-09-23 | 2019-12-31 | 南京市食品药品监督检验院 | Three-dimensional cell paper chip sensor and application thereof in bacterial lipopolysaccharide detection |
| CN111936854A (en) * | 2018-03-29 | 2020-11-13 | 塞洛蒂克斯公司 | Improved electrode for electrochemical devices |
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| CN103575795A (en) * | 2013-11-03 | 2014-02-12 | 桂林理工大学 | Method for detecting L-tyrosine content in beer sample |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111936854A (en) * | 2018-03-29 | 2020-11-13 | 塞洛蒂克斯公司 | Improved electrode for electrochemical devices |
| CN110632160A (en) * | 2019-09-23 | 2019-12-31 | 南京市食品药品监督检验院 | Three-dimensional cell paper chip sensor and application thereof in bacterial lipopolysaccharide detection |
| CN110632160B (en) * | 2019-09-23 | 2022-02-01 | 南京市食品药品监督检验院 | Three-dimensional cell paper chip sensor and application thereof in bacterial lipopolysaccharide detection |
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