用尿素修改的ZnO薄膜的研究:作为氨感应器的方法
Venkata Satya Chidambara Swamy Vaddadi1, Saidi Reddy Parne1, Nagaraju Pothukanuri2
1Department of Applied Sciences, National Institute of Technology-Goa, Ponda 403401, India.
ACS omega
|May 30, 2023
概括
将尿素添加到氧化 (ZnO) 膜中可以提高其检测氨气的能力. 2%重量%的尿素修饰产生了用于检测氨气的最佳气体感应特性.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术纳米技术
背景情况:
- 氧化 (ZnO) 是一种半导体,在气体传感中具有有前途的应用.
- 修改ZnO纳米结构可以提高其检测特定气体的性能.
- 尿素修饰被探索为一种方法来增强ZnO薄膜的气体感应能力.
研究的目的:
- 研究尿素度对ZnO薄膜的结构,形态,光学和气体感应性质的影响.
- 为了优化尿素修饰的ZnO薄膜用于氨气检测.
- 了解材料特性与气体传感性能之间的关系.
主要方法:
- 纯氧化和用尿素修饰的氧化薄膜使用喷雾热解技术合成.
- 将不同度的尿素添加到酸前体中.
- 分析了结构,形态和光学特性.
- 气体感应性能使用静态液体分配技术以25ppm的氨在27°C时进行评估.
主要成果:
- 尿素修饰影响了ZnO薄膜的结构,形态和光学特性.
- 含有2%重量%尿素的ZnO薄膜对氨气蒸气具有优越的传感性能.
- 修改表面上增加的活性位点促进了与氨的反应.
结论:
- 尿素修饰是一种有效的策略,可以提高ZnO薄膜的气体感应性能.
- 最佳的尿素度为2重%显著改善了氨的检测.
- 增强的传感归因于表面反应性增加和气体与表面相互作用的活性点.
相关概念视频
01:261° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
01:202° Amines to N-Nitrosamines: Reaction with NaNO2
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
01:371° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.