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A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Sensor Materials".

Deadline for manuscript submissions: closed (20 October 2024) | Viewed by 15695

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Special Issue Editors

Dr. Daewon Kim

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Guest Editor

Department of Aerospace Engineering, Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
Interests: flexible sensors; acoustics; wireless; embedded sensors; additive manufacturing

Dr. Nathan Salowitz

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Guest Editor

Department of Mechanical Engineering, University of Wisconsin, Madison, WI, USA
Interests: piezoelectrics; SMA; self-healing materials; ultrasonics; sensor integration
Special Issues, Collections and Topics in MDPI journals

Dr. Zhenhua Tian

E-Mail Website
Guest Editor

Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, USA
Interests: acoustics; vibrations; piezoelectric materials; metamaterials; acoustic tweezers

Special Issue Information

Dear Colleagues,

Sensor technologies have rapidly advanced opening new doors to true digital transformation, connecting machines, products, and people through industrial internet of things and digital twin platforms. With an increased focus on new sensing technologies, the development of advanced sensors that possess unique or multifunctional properties using various attributes of intelligent materials is accelerating the pace of the hyper-connected industrial revolution.

The goal of this Special Issue is to highlight the state-of-the-art research on the development of advanced sensors that utilize smart materials, which are formed in various sizes and shapes for diverse engineering and scientific fields. We sincerely invite you to submit original unpublished work on the listed or related topics.

Topics of interest include, but are not limited to, the following:

Smart materials for sensing
Sensing principles and technologies
Sensors with additive manufacturing
Flexible and wearable sensors
Biomedical sensors
Embeddable sensors
Metamaterial sensors
Multifunctional sensors
Wireless and remote sensors
Theory and modelling of advanced sensors
Design, manufacturing, data analysis of advanced sensors
AI and machine learning related to advanced sensors

Dr. Daewon Kim
Dr. Nathan Salowitz
Dr. Zhenhua Tian
Guest Editors

Manuscript Submission Information

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Keywords

smart materials
sensing principles and technologies
sensors with additive manufacturing
flexible and wearable sensors
biomedical sensors
embeddable sensors
metamaterial sensors
multifunctional sensors
wireless and remote sensors
theory and modelling of advanced sensors
design, manufacturing, data analysis of advanced sensors
AI and machine learning related to advanced sensors

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Published Papers (9 papers)

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Research

24 pages, 6564 KiB

Open AccessArticle

Experimental Investigation of Steel-Borne Acoustic Pulses for Fault Pinpointing in Pipe-Type Cable Systems: A Scaled-Down Model Approach

by Zaki Moutassem, Gang Li and Weidong Zhu

Sensors 2024, 24(21), 7043; https://doi.org/10.3390/s24217043 - 31 Oct 2024

Viewed by 796

Abstract

Pipe-type cable systems, including high-pressure fluid-filled (HPFF) and high-pressure gas-filled cables, are widely used for underground high-voltage transmission. These systems consist of insulated conductor cables within steel pipes, filled with pressurized fluids or gases for insulation and cooling. Despite their reliability, faults can occur due to insulation degradation, thermal expansion, and environmental factors. As many circuits exceed their 40-year design life, efficient fault localization becomes crucial. Fault location involves prelocation and pinpointing. Therefore, a novel pinpointing approach for pipe-type cable systems is proposed, utilizing accelerometers mounted on a steel pipe to capture fault-induced acoustic signals and employing the time difference of arrival method to accurately pinpoint the location of the fault. The experimental investigations utilized a scaled-down HPFF pipe-type cable system setup, featuring a carbon steel pipe, high-frequency accelerometers, and both mechanical and capacitive discharge methods for generating acoustic pulses. The tests evaluated the propagation velocity, attenuation, and pinpointing accuracy with the pipe in various embedment conditions. The experimental results demonstrated accurate fault pinpointing in the centimeter range, even when the pipe was fully embedded, with the acoustic pulse velocities aligning closely with the theoretical values. These experimental investigation findings highlight the potential of this novel acoustic pinpointing technique to improve fault localization in underground systems, enhance grid reliability, and reduce outage duration. Further research is recommended to validate this approach in full-scale systems. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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18 pages, 8548 KiB

Open AccessArticle

Pneumatic Bellow Actuator with Embedded Sensor Using Conductive Carbon Grease

by David Moreno, Diana Narvaez and Brittany Newell

Sensors 2024, 24(16), 5403; https://doi.org/10.3390/s24165403 - 21 Aug 2024

Viewed by 931

Abstract

The present work demonstrates the manufacturing process of a pneumatic bellow actuator with an embedded sensor, utilizing a novel manufacturing approach through the complete use of additive manufacturing techniques, such as direct ink writing (DIW) and traditional fused deposition modeling (FDM) methods. This study is innovative in its integration of a dielectric electroactive polymer (DEAP) structure with sensing electrodes made of conductive carbon grease (CCG), showcasing a unique application of a 3D-printed DEAP with CCG electrodes for combined DEAP sensing and pneumatic actuation. Initial experiments, supported by computational simulations, evaluated the distinct functionality of the DEAP sensor by itself under various pressure conditions. The findings revealed a significant change in capacitance with applied pressure, validating the sensor’s performance. After sensor validation, an additive manufacturing process for embedding the DEAP structure into a soft pneumatic actuator was created, exhibiting the system’s capability for dual sensing and actuation, as the embedded sensor effectively responded to applied actuation pressure. This dual functionality represents an advancement in soft actuators, especially in applications that require integrated and responsive actuation and sensing capabilities. This work also represents a preliminary step in the development of a 3D-printed dual-modality actuator (pneumatic and electrically activated DEAP) with embedded sensing. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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15 pages, 3624 KiB

Open AccessArticle

Polymer Nanocomposite Sensors with Improved Piezoelectric Properties through Additive Manufacturing

by Rishikesh Srinivasaraghavan Govindarajan, Zefu Ren, Isabel Melendez, Sandra K. S. Boetcher, Foram Madiyar and Daewon Kim

Sensors 2024, 24(9), 2694; https://doi.org/10.3390/s24092694 - 24 Apr 2024

Cited by 2 | Viewed by 1766

Abstract

Additive manufacturing (AM) technology has recently seen increased utilization due to its versatility in using functional materials, offering a new pathway for next-generation conformal electronics in the smart sensor field. However, the limited availability of polymer-based ultraviolet (UV)-curable materials with enhanced piezoelectric properties necessitates the development of a tailorable process suitable for 3D printing. This paper investigates the structural, thermal, rheological, mechanical, and piezoelectric properties of a newly developed sensor resin material. The polymer resin is based on polyvinylidene fluoride (PVDF) as a matrix, mixed with constituents enabling UV curability, and boron nitride nanotubes (BNNTs) are added to form a nanocomposite resin. The results demonstrate the successful micro-scale printability of the developed polymer and nanocomposite resins using a liquid crystal display (LCD)-based 3D printer. Additionally, incorporating BNNTs into the polymer matrix enhanced the piezoelectric properties, with an increase in the voltage response by up to 50.13%. This work provides new insights for the development of 3D printable flexible sensor devices and energy harvesting systems. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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15 pages, 4908 KiB

Open AccessArticle

Electromechanical Properties of Smart Vitrimers Reinforced with Carbon Nanotubes for SHM Applications

by Javier Gómez-Sánchez, Xoan F. Sánchez-Romate, Francisco Javier Espadas, Silvia G. Prolongo and Alberto Jiménez-Suárez

Sensors 2024, 24(3), 806; https://doi.org/10.3390/s24030806 - 26 Jan 2024

Cited by 1 | Viewed by 1717

Abstract

The Structural Health Monitoring (SHM) capabilities of a well-studied self-healing epoxy resin based on disulfide bonds, through the addition of carbon nanotubes (CNTs), are studied. Since these materials demonstrated, in recent works, a high dependency of the dynamic hardener content on the repair performance, this study aimed to analyze the effect of the vitrimeric chemistry on the electromechanical properties by studying different 2-aminophenyl disulfide (2-AFD) hardener and CNT contents. The electrical conductivity increases with both the CNT and AFD contents, in general. Moreover, an excess of AFD close to the stoichiometric ratio with a low CNT content improved the tensile strength by 45%, while higher AFD contents promoted its detriment by 41% due to a reduced crosslinking density. However, no significant difference in the mechanical properties was observed at a higher CNT content, regardless of the AFD ratio. The developed materials demonstrate a robust electromechanical response at quasi-static conditions. The sensitivity significantly increases at higher AFD ratios, from 0.69 to 2.22 for the 0.2 wt.%. CNT system, which is advantageous due to the enhanced repair performance of these vitrimeric materials with a higher hardener content. These results reveal the potential use of self-healing vitrimers as integrated SHM systems capable of detecting damages and self-repairing autonomously. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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22 pages, 7764 KiB

Open AccessArticle

Dynamic Characterization of a Low-Cost Fully and Continuously 3D Printed Capacitive Pressure-Sensing System for Plantar Pressure Measurements

by Andrew T. Gothard, Jacob W. Hott and Steven R. Anton

Sensors 2023, 23(19), 8209; https://doi.org/10.3390/s23198209 - 30 Sep 2023

Cited by 2 | Viewed by 1819

Abstract

In orthopedics, the evaluation of footbed pressure distribution maps is a valuable gait analysis technique that aids physicians in diagnosing musculoskeletal and gait disorders. Recently, the use of pressure-sensing insoles to collect pressure distributions has become more popular due to the passive collection of natural gait data during daily activities and the reduction in physical strain experienced by patients. However, current pressure-sensing insoles face the limitations of low customizability and high cost. Previous works have shown the ability to construct customizable pressure-sensing insoles with capacitive sensors using fused-deposition modeling (FDM) 3D printing. This work explores the feasibility of low-cost fully and continuously 3D printed pressure sensors for pressure-sensing insoles using three sensor designs, which use flexible thermoplastic polyurethane (TPU) as the dielectric layer and either conductive TPU or conductive polylactic acid (PLA) for the conductive plates. The sensors are paired with a commercial capacitance-to-voltage converter board to form the sensing system. Dynamic sensor performance is evaluated via sinusoidal compressive tests at frequencies of 1, 3, 5, and 7 Hz, with pressure levels varying from 14.33 to 23.88, 33.43, 52.54, and 71.65 N/cm² at each frequency. Five sensors of each type are tested. Results show that all sensors display significant hysteresis and nonlinearity. The PLA-TPU sensor with 10% infill is the best-performing sensor with the highest average sensitivity and lowest average hysteresis and linearity errors. The range of average sensitivities, hysteresis, and linearity errors across the entire span of tested pressures and frequencies for the PLA-TPU sensor with 10% infill is 11.61–20.11·10⁻⁴ V/(N/cm²), 11.9–31.8%, and 9.0–22.3%, respectively. The significant hysteresis and linearity error are due to the viscoelastic properties of TPU, and some additional nonlinear effects may be due to buckling of the infill walls of the dielectric. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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19 pages, 3215 KiB

Open AccessArticle

Electrochemical Sensing Platform Based on Carbon Dots for the Simultaneous Determination of Theophylline and Caffeine in Tea

by Paola Di Matteo, Alessandro Trani, Martina Bortolami, Marta Feroci, Rita Petrucci and Antonella Curulli

Sensors 2023, 23(18), 7731; https://doi.org/10.3390/s23187731 - 7 Sep 2023

Cited by 7 | Viewed by 1920

Abstract

A simple and selective method for the determination of caffeine (CAF) and theophylline (THEO) has been developed for a glassy carbon electrode (GCE) modified with a composite including carbon dots (CDs) and chitosan (CS). To our knowledge, there are no previous studies that analyze a CDs-modified GCE for the presence of CAF and THEO. The electrochemical behavior of a GCE modified with a CDs-CS composite was studied in acidic medium by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Considering the sensor analytical parameters, the same linear concentrations range was found for CAF and THEO ranging from 1 × 10⁻⁵ to 5 × 10⁻³ mol L⁻¹ with the same detection limit (LOD) of 1 × 10⁻⁶ mol L⁻¹. The reproducibility and repeatability data were satisfactory in terms of RSD%. Moreover, the storage stability was evaluated, evidencing good results whatever the experimental conditions used. The developed sensor was applied for the simultaneous determination of CAF and THEO in tea and drug, and results were compared with those obtained with HPLC-ESI-MS in SIR mode as an independent method optimized on purpose. The electrochemical sensor presents the undoubled advantages in terms of cheapness, portability, and ease of use, since it does not require skilled personnel. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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13 pages, 2652 KiB

Open AccessArticle

Development of Fiber-Bragg-Grating-Integrated Artificial Embedded Tendon for Multifunctional Assessment of Temperature, Strain, and Curvature

by Robertson Pires-Junior, Anselmo Frizera, Carlos Marques and Arnaldo Leal-Junior

Sensors 2023, 23(17), 7332; https://doi.org/10.3390/s23177332 - 22 Aug 2023

Cited by 1 | Viewed by 1302

Abstract

This paper presents the development and application of an optical fiber-embedded tendon based on biomimetic multifunctional structures. The tendon was fabricated using a thermocure resin (polyurethane) and the three optical fibers with one fiber Bragg grating (FBG) inscribed in each fiber. The first step in the FBG-integrated artificial tendon analysis is the mechanical properties assessment through stress–strain curves, which indicated the customization of the proposed device, since it is possible to tailor the Young’s modulus and strain limit of the tendon as a function of the integrated optical fibers, where the coated and uncoated fibers lead to differences in both parameters, i.e., strain limits and Young’s modulus. Then, the artificial tendon integrated with FBG sensors undergoes three types of characterization, which assesses the influence of temperature, single-axis strain, and curvature. Results show similarities in the temperature responses in all analyzed FBGs, where the variations are related to the heterogeneity on the polyurethane matrix distribution. In contrast, the FBGs embedded in the tendon presented a reduction in the strain sensitivity when compared with the bare FBGs (i.e., without the integration in the artificial tendon). Such results demonstrated a reduction in the sensitivity as high as 77% when compared with the bare FBGs, which is related to strain field distributions in the FBGs when embedded in the tendon. In addition, the curvature tests indicated variations in both optical power and wavelength shift, where both parameters are used on the angle estimation using the proposed multifunctional artificial tendon. To that extent, root mean squared error of around 3.25° is obtained when both spectral features are considered. Therefore, the proposed approach indicates a suitable method for the development of smart structures in which the multifunctional capability of the device leads to the possibility of using not only as a structural element in tendon-driven actuators and devices, but also as a sensor element for the different structures. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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14 pages, 12249 KiB

Open AccessArticle

Paintable Silicone-Based Corrugated Soft Elastomeric Capacitor for Area Strain Sensing

by Han Liu, Simon Laflamme and Matthias Kollosche

Sensors 2023, 23(13), 6146; https://doi.org/10.3390/s23136146 - 4 Jul 2023

Cited by 2 | Viewed by 1846

Abstract

Recent advances in soft polymer materials have enabled the design of soft machines and devices at multiple scales. Their intrinsic compliance and robust mechanical properties and the potential for a rapid scaling of the production process make them ideal candidates for flexible and stretchable electronics and sensors. Large-area electronics (LAE) made from soft polymer materials that are capable of sustaining large deformations and covering large surfaces and are applicable to complex and irregular surfaces and transducing deformations into readable signals have been explored for structural health monitoring (SHM) applications. The authors have previously proposed and developed an LAE consisting of a corrugated soft elastomeric capacitor (cSEC). The corrugation is used to engineer the directional strain sensitivity by using a thermoplastic styrene-ethylene-butadiene-styrene (SEBS). A key limitation of the SEBS-cSEC technology is the need of an epoxy for reliable bonding of the sensor onto the monitored surface, mainly attributable to the sensor’s fabrication process that comprises a solvent that limits its direct deployment through a painting process. Here, with the objective to produce a paintable cSEC, we study an improved solvent-free fabrication method by using a commercial room-temperature-vulcanizing silicone as the host matrix. The matrix is filled with titania particles to form the dielectric layer, yielding a permittivity of 4.05. Carbon black powder is brushed onto the dielectric and encapsulated with the same silicone to form the conductive stretchable electrodes. The sensor is deployed by directly painting a layer of the silicone onto the monitored surface and then depositing the parallel plate capacitor. The electromechanical behavior of the painted silicone-cSEC was characterized and exhibited good linearity, with an R

^{2}

value of 0.9901, a gauge factor of 1.58, and a resolution of 70

μ ε

. This resolution compared well with that of the epoxied SEBS-cSEC reported in previous work (25

μ ε

). Its performance was compared against that of its more mature version, the SEBS-cSEC, in a network configuration on a cantilever plate subjected to a step-deformation and to free vibrations. Results showed that the performance of the painted silicone-sCEC compared well with that of the SEBS-cSEC, but that the use of a silicone paint instead of an epoxy could be responsible for larger noise and the under-estimation of the dominating frequency by 6.7%, likely attributable to slippage. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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14 pages, 3851 KiB

Open AccessArticle

Chemometric-Assisted Litmus Test: One Single Sensing Platform Adapted from 1–13 to Narrow pH Ranges

by Lisa Rita Magnaghi, Giancarla Alberti, Camilla Zanoni, Marta Guembe-Garcia, Paolo Quadrelli and Raffaela Biesuz

Sensors 2023, 23(3), 1696; https://doi.org/10.3390/s23031696 - 3 Feb 2023

Cited by 5 | Viewed by 2063

Abstract

A novel 3 × 4 colorimetric sensing platform, named the chemometric-assisted litmus test (CLT), has been developed by covalently anchoring commercial pH indicators to ethylene vinyl alcohol (EVOH). The proposed device can be exploited for pH determinations in a wide range from 1 to 13 and in specific narrow ranges, achieving sufficient accuracy and errors below 0.5 pH units. The experimental procedure is simple, quick and reliable; equilibration is reached in less than 2 h, CLT pictures are acquired by a camera, and data treatment is performed applying chemometric techniques such as principal component analysis (PCA) and partial least square regression (PLS) to RGB indices. Full article

(This article belongs to the Special Issue Advanced Sensors Using Smart Materials)

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