Sensitive electrochemical sensor for nitrite ions based on rose-like AuNPs/MoS2/graphene composite
Yujie Han1, Ran Zhang1, Chuan Dong1
1Institute of Environmental Science, Shanxi University, Taiyuan, 030006, China.
Biosensors & Bioelectronics
|July 28, 2019
Summary
A novel electrochemical sensor utilizing gold nanoparticles/molybdenum disulfide nanoflower/graphene composite was developed for sensitive nitrite detection. This cost-effective method offers rapid and selective analysis of nitrite ions, crucial for environmental and health monitoring.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Science
Background:
- Nitrite ions (NO2-) are widely used as food preservatives but pose environmental and health risks.
- Sensitive and selective detection of nitrite is essential due to its potential toxicity.
Purpose of the Study:
- To develop a rapid, sensitive, and cost-effective electrochemical sensor for nitrite detection.
- To fabricate a novel composite material for enhanced electrocatalytic activity.
Main Methods:
- A one-pot hydrothermal method was used to synthesize a rose-like Au nanoparticles/MoS2 nanoflower/graphene (AuNPs/MoS2/GN) composite.
- The composite material was characterized and utilized as an electrode for electrochemical nitrite detection.
Main Results:
- The AuNPs/MoS2/GN composite exhibited excellent electrooxidative activity towards nitrite ions.
- The developed electrochemical sensor achieved a linear dynamic range of 5.0 μM to 5.0 mM with a low detection limit of 1.0 μM.
Conclusions:
- The fabricated sensor provides a highly effective method for nitrite detection.
- The one-pot synthesis approach is versatile for creating various nanohybrids for sensor applications.
Related Concept Videos
01:26What is an Electrochemical Gradient?
127.4K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
127.4K
02:54Ions as Acids and Bases
26.2K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.2K
01:19Ion Channels
91.2K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.2K
01:17Solution Composition During Acid/Base Titrations
1.5K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
The α0 and α1 values...
1.5K
03:24Common Ion Effect
46.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
46.0K
03:35Classifying Matter by Composition
89.7K
Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
89.7K