Li-substituted ZnO nanoparticles exhibiting room temperature optical gas sensing for NO2 with swift response and recovery

IF 3.3 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Neha Singh, Nitu Singh, Abhinav Bhargav, K. M. Mishra, Jyoti Bamne, Fozia Z. Haque
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Abstract

This paper reports the results of NO2 gas sensing performance through photoluminescence method. The pure and Li substituted (0.1%, 0.2%, and 0.3% w/w) zinc oxide nanoparticles were synthesized via simple aqueous solution growth technique.The structural, morphological and optical properties of the samples were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, UV–Vis spectroscopy, and photoluminescence (PL) spectroscopy. PL spectral studies indicated that the synthesized ZnO nanoparticles possess more vacancies or lattice defects compared to the well explored ZnO nanoparticles prepared using various other synthesis techniques. The presented work focuses on optical gas sensing at room temperature under normal atmospheric pressure to detect the presence of nitrogen dioxide. The optical NO2 gas sensing studies revealed the substantial role of Li doping on the sensing properties of the synthesized samples, with gas concentrations ranging from 500 ppb to 30 ppm. Remarkably, 0.3% w/w Li-doped ZnO nanoparticles demonstrated an 70.25% response to 30 ppm NO2 gas, with a quick response time (τ) of 16 s and a recovery time of approximately 21 s at room temperature and normal atmospheric pressure. The short response, recovery time, high sensing response, low detection limit and stability exhibited by 0.3% Li-ZnO nanoparticles make them promising candidate fordesigning efficient and reliable optical sensors for NO2 gas.

Graphical abstract

li -取代ZnO纳米粒子对NO2具有快速响应和回收的室温光学气敏性能
本文报道了采用光致发光方法对NO2气敏性能进行测试的结果。通过简单的水溶液生长技术合成了纯氧化锌纳米粒子和锂取代氧化锌纳米粒子(0.1%、0.2%和0.3% w/w)。采用扫描电子显微镜、透射电子显微镜、x射线衍射、紫外可见光谱和光致发光光谱对样品的结构、形态和光学性质进行了表征。PL光谱研究表明,与使用其他合成技术制备的ZnO纳米颗粒相比,合成的ZnO纳米颗粒具有更多的空位或晶格缺陷。提出的工作重点是光学气体传感在室温下正常大气压检测二氧化氮的存在。光学NO2气敏研究揭示了Li掺杂对合成样品的传感性能的重要作用,气体浓度范围为500 ppb至30 ppm。值得注意的是,0.3% w/w li掺杂ZnO纳米粒子对30 ppm NO2气体的响应率为70.25%,在室温和常压下的快速响应时间(τ)为16 s,恢复时间约为21 s。0.3% Li-ZnO纳米粒子具有响应时间短、恢复时间长、灵敏度高、检出限低和稳定性好的特点,是设计高效、可靠的NO2气体光学传感器的理想材料。图形抽象
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来源期刊
Optical and Quantum Electronics
Optical and Quantum Electronics 工程技术-工程:电子与电气
CiteScore
4.60
自引率
20.00%
发文量
810
审稿时长
3.8 months
期刊介绍: Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.
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