In-Situ Chemical Conversion Approach for Growth of Magnesium-Aluminium-Layered Double Hydroxide Thin Films: Room Temperature NO2 Sensing

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-09-30 DOI:10.1016/j.snb.2025.138890

Shweta Talekar, Prashant Sawant, Shraddha Pawar, Shashikant Patole, Mayura Medhekar, Ganesh Khande, Sayali Kulkarni, Hemraj Yadav, Jayavant Gunjakar

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Abstract

The direct deposition of layered double hydroxide on a substrate is highly desirable for a gas sensor. In this work, we demonstrate the direct deposition of magnesium-aluminum-layered double hydroxide (MA-LDH) thin film (TF) by chemical conversion of magnesium oxide (MgO) TF. The chemical conversion of MgO TFs produces well-crystalline, porous microsheets composed of an interconnected nanoparticle network of MA-LDH, which provides an enhanced surface area with a highly accessible framework, making MA-LDH TFs promising candidates for efficient gas sensor electrodes. Furthermore, the resulting MA-LDH TFs are tested as resistive sensor electrodes to detect different oxidizing (SO₂, Cl₂, and NO₂) and reducing (LPG, CO, CO₂, H₂, H₂S, and NH₃) gases. The MA-LDH TF exhibited excellent selectivity towards NO₂ gas with a maximum response of 54% at room temperature (300 ± 2 K) compared to pristine MgO TFs (14%) at 473 K for 100 ppm. Also, it exhibits a quick response time of 10 s, a detection limit of 0.02 ppm, and prolonged stability. Of prime interest is that the MA-LDH sensor displayed high tolerance to humidity conditions. The excellent NO₂ sensing performance of the MA-LDH TFs is attributed to the expanded surface area, which is composed of porous microsheets formed by interconnected nanoparticles network. The direct deposition of an interconnected microsheet network provides abundant active adsorption sites, thereby enhancing gas sensing efficiency.

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原位化学转化法生长镁铝层双氢氧化物薄膜：室温NO2传感

在衬底上直接沉积层状双氢氧化物对于气体传感器来说是非常理想的。在这项工作中，我们展示了通过氧化镁（MgO） TF的化学转化直接沉积镁铝层状双氢氧化物（MA-LDH）薄膜（TF）。MgO TFs的化学转化产生了由MA-LDH相互连接的纳米颗粒网络组成的结晶良好的多孔微片，它提供了一个高度可访问的框架的增强表面积，使MA-LDH TFs成为高效气体传感器电极的有希望的候选者。此外，将生成的MA-LDH tf作为电阻式传感器电极进行测试，以检测不同的氧化性（SO2、Cl2和NO2）和还原性（LPG、CO、CO2、H2、H2S和NH3）气体。MA-LDH TF对NO2气体表现出优异的选择性，在室温（300±2 K）下的最大响应为54%，而原始MgO TF在473 K、100 ppm下的最大响应为14%。此外，它还具有10 s的快速响应时间，0.02 ppm的检测限和较长的稳定性。最重要的是，MA-LDH传感器对湿度条件的耐受性很高。MA-LDH TFs具有优异的NO2传感性能，其表面面积扩大，由相互连接的纳米颗粒网络组成的多孔微片组成。微片网络的直接沉积提供了丰富的活性吸附位点，从而提高了气敏效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.