Ferreira Débora Ely Medeiros, Pinheiro Paula Fabíola Pantoja, Ferreira Luiza Marilac Pantoja, Santos Leandro José Sena, Pabón Rosa Elvira Correa, Reis Marcos Allan Leite
Postgraduate Program in Materials Science and Engineering, Federal University of Para, Ananindeua 67130-660, PA, Brazil.
3D Nanostructuring Laboratory, Federal University of Para, Belem 66075-110, PA, Brazil.
Nanomaterials (Basel). 2025 Aug 5;15(15):1197. doi: 10.3390/nano15151197.
The development of miniaturized sensors has become relevant for the detection of chemical/biological substances, since they use and detect low concentrations, such as flocculants based on amines for the mining industry. In this study, buckypaper (BP) films based on carboxylic acid functionalized multi-walled carbon nanotubes (f-MWCNTs) were produced through vacuum filtration on cellulose filter paper to carry out sensory function in samples containing ether-amine (volumes: 1%, 5%, 10% and 100%). The morphological characterization of the BPs by scanning electron microscopy showed f-MWCNT aggregates randomly distributed on the cellulose fibers. Vibrational analysis by Raman spectroscopy indicated bands and sub-bands referring to f-MWCNTs and vibrational modes corresponding to chemical bonds present in the ether-amine (EA). The electrical responses of the BP to the variation in analyte concentration showed that the sensor differentiates deionized water from ether-amine, as well as the various concentrations present in the different analytes, exhibiting response time of 3.62 ± 0.99 min for the analyte containing 5 vol.% EA and recovery time of 21.16 ± 2.35 min for the analyte containing 10 vol.% EA, revealing its potential as a real-time response chemiresistive sensor.
小型化传感器的发展对于化学/生物物质的检测具有重要意义，因为它们能够使用并检测低浓度物质，例如采矿业中基于胺的絮凝剂。在本研究中，通过在纤维素滤纸上进行真空过滤制备了基于羧酸功能化多壁碳纳米管（f-MWCNTs）的巴基纸（BP）薄膜，以在含有醚胺（体积分数：1%、5%、10%和100%）的样品中实现传感功能。通过扫描电子显微镜对BP进行形态表征，结果显示f-MWCNT聚集体随机分布在纤维素纤维上。拉曼光谱的振动分析表明，存在与f-MWCNTs相关的谱带和子谱带以及对应于醚胺（EA）中化学键的振动模式。BP对分析物浓度变化的电响应表明，该传感器能够区分去离子水和醚胺，以及不同分析物中存在的各种浓度，对于含有5 vol.% EA的分析物，响应时间为3.62±0.99分钟，对于含有10 vol.% EA的分析物，恢复时间为21.16±2.35分钟，揭示了其作为实时响应化学电阻传感器的潜力。
