SO2 Gas Sensing by Nanometer-Thick Soap Films Using Conductometry and Fluorimetry

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-06-04 DOI:10.1021/acs.langmuir.5c0133610.1021/acs.langmuir.5c01336

Xiurong Cui, Xuan Huang, Jingni Fu, Jiali Zhao, Sheng Tian and Luning Zhang*,

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Abstract

Conductometric and fluorometric sensing of SO₂ gas using common black films (CBF) of nanometer thickness (<20 nm) with large specific surface area (about 10⁸ m^–1) was shown. For conductometry, H₂O₂ molecules in the soap film oxidized SO₂ and increased the conductance by producing H₃O⁺, HSO₄^–, and SO₄^2– ions. Limit of detection (LOD) for this assay was 70 parts per billion (ppb), and a linear signal–concentration relation was seen up to 1 ppm (ppm) of SO₂ in the air. In the 1–25 ppm range, a monotonic yet nonlinear increasing correlation was seen. For fluorimetry, SO₂ reacted quantitatively with Rhodamine B hydrazide in CBF to form highly fluorescent Rhodamine B molecules. The LOD was 100 ppb, and a linear signal–concentration relation was seen for 0.1–25 ppm of SO₂ in the air. Sensing of SO₂ released by wine and beer samples was also demonstrated.

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纳米厚肥皂膜的二氧化硫气体传感电导法和荧光法

利用具有较大比表面积（约108 m-1）的纳米厚度（< 20nm）的普通黑色薄膜（CBF）对SO2气体进行了电导和荧光传感。在电导率方面，肥皂膜中的H2O2分子通过生成h30 +、HSO4 -和SO42 -离子来氧化SO2并增加电导率。该分析的检出限（LOD）为十亿分之七十（ppb），并且在空气中SO2高达1 ppm （ppm）时，可以看到线性信号-浓度关系。在1 - 25ppm范围内，呈现单调但非线性的增加相关性。在荧光学中，SO2在CBF中与罗丹明B酰肼定量反应，形成高荧光罗丹明B分子。LOD为100 ppb，空气中SO2浓度为0.1 ~ 25 ppm时，信号与浓度呈线性关系。还演示了葡萄酒和啤酒样品释放的SO2的传感。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).