## 1 Introduction  
Advances in different sensor fabrication technologies and versatile materials with flexible mechanical, electrical, and thermal properties have enabled the development of various kinds of lab-on-a-chip devices. Textile materials have emerged as cutting-edge transducer materials which can be integrated with microelectronics to give rise to nonconventional functional sensing devices, light-emitting devices, circuit boards, batteries, supercapacitors, solar cells, memory devices, etc. [1, 2]. In the medical field, textile substrates act as sophisticated supporting structures in drug delivery devices for the controlled release of biologically active compounds from essential oils (EOs) [3, 4]. The combined application of textiles with different EOs leads to the development of functional fabrics, such as antimicrobial textiles, medicinal textiles, fragrant textiles, and insect-repellent textiles [5, 6]. For example, laverd, thymol, savory, and cinnamon bark EOs were used in concentrations from 1 to 5% to stimulate antimicrobial activity in polylactic acid fabric [7]. Additionally, cinnamon EO was demonstrated to be a good inhibitor for fungal and bacterial growth in heritage textiles [8]. Lime (_C. aurantiglia_) EO was used to functionalize cotton fabric which possessed antibacterial activities [9]. EOs are complex mixtures of plant-derived compounds which possess various antioxidant and antimicrobial properties. EOs are biodegradable; environmentally friendly; and have found numerous applications in the medicine, pharmaceutical, agricultural, and food industries [10, 11, 12]. Furthermore, the versatile and complex composition of EOs allows them to be potentially used in the metal and electronics industry. For example, rosmetry, myrtle,and garlic EOs were used as anti-corrosive agents for copper [13; 14], while orange peel EO was used as the main component of heavy metal sensors [15]. Moreover, EOs derived from surfactants are good ecological and economical alternatives to petrochemical-based detergents [16]. Thus, checking the authenticity and quality of EOs is imperative. However, current methods used for assessing the quality of EO include gas chromatography and mass spectroscopy, which are expensive and time-consuming techniques that require highly trained personnel to operate the equipment [17]. To mitigate this, continuous efforts have been made to make the identification and characterization of EOs simpler and more accessible. [PERSON] et al. assessed thyme EO vapors based on the quantitative release rates from EO-impregnated nanofibers [12]. [PERSON] et al. developed a technique for the in-situ analysis of EO by combining a transferable mass spectrometer with a direct inlet membrane [18]. [PERSON] et al. proposed an alternative method for the detection of major compounds within clove essential oil using an electronic nose coupled with polymeric nanocomposite films [19]. [PERSON] et al. used metal oxide semiconductor (MOS) gas sensors with a temperature modulation-specified detection point technique to assess the vapors of different EOs [20]. Furthermore, the compatibility of textiles and essential oils extends the possibilities of future applications of textile-based chips in electrical measurements. Electrochemical impedance spectroscopy (EIS) is one of the well-known electrical techniques used for monitoring electrochemical processes for a variety of applications. The dielectric properties of tested essential oils or water-oil mixtures are shown as a function of radiofrequency. EIS allows for the identification of different contributors in mixtures and the continuous monitoring of time-dependent water-oil dynamics [21; 22]. In this study, we proposed a silver threads-based portable textile platform for the identification of different essential oil types and their concentrations using EIS. The essential oils evaluated in this study were tea tree oil, clary sage, and cinnamon essential oil. These EOs are still insufficiently researched in the scientific world.