Article
Chemistry, Physical
Yu-Hsuan Chiao, Mani Sivakumar, Sudesh Yadav, Shiro Yoshikawa, Wei-Song Hung
Summary: This study successfully achieved uniform and stable dispersion of graphene using a sodium silicate and water solution, reducing the probability of pi-pi stacking and further decreasing the van der Waals interaction between graphene layers. By optimizing the dispersion process, the stability of dispersion was ensured, allowing for screen printing on different flat materials.
Article
Instruments & Instrumentation
Zaihua Duan, Yadong Jiang, Qi Huang, Si Wang, Yang Wang, Hong Pan, Qiuni Zhao, Guangzhong Xie, Xiaosong Du, Huiling Tai
Summary: The study proposed low-cost, eco-friendly, flexible, multifunctional pressure and humidity sensors by utilizing the characteristics of paper and carbon ink. These sensors demonstrated good sensitivity and response, allowing for various monitoring functions from contact to non-contact, significantly improving the comfort of wearable devices.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Chemistry, Physical
Fedora Vasileva, Vasiliy Popov, Irina Antonova, Svetlana Smagulova
Summary: In this study, screen-printed flexible humidity sensor and supercapacitor structures were successfully obtained using a suspension of mildly oxidized graphene (MOG). The performances of the structures were enhanced through thermal reduction and laser reduction. The study also demonstrated the potential value of various screen-printed structures in flexible electronics applications.
Article
Chemistry, Multidisciplinary
Daniel Matatagui, Carlos Cruz, Felix Carrascoso, Abdullah M. Al-Enizi, Ayman Nafady, Andres Castellanos-Gomez, Maria del Carmen Horrillo
Summary: We developed low-cost and disposable gas sensors with a low environmental impact. These sensors are based on biodegradable paper substrate and use safe electronic materials. The sensors utilize WS2 nanoplatelets deposited on paper through abrasion as a sensing layer, demonstrating high sensitivity and selectivity even at room temperature. The sensors exhibit a significant drop in electrical resistance upon NO2 adsorption, making them promising candidates for on-site continuous monitoring of NO2.
Article
Engineering, Electrical & Electronic
Akshaya Kumar Aliyana, Priyanka Ganguly, Ajay Beniwal, S. K. Naveen Kumar, Ravinder Dahiya
Summary: The estimation of pH is crucial in various applications, and this study presents a screen-printed flexible and disposable pH sensor that uses the impedimetric method. The sensor exhibits high sensitivity and can be used for pH monitoring of soil, potentially contributing to digital agriculture.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
M. Adeel Zafar, Yang Liu, Scarlett Allende, Mohan V. Jacob
Summary: The present article describes a novel approach to the green and in-situ synthesis of graphene and silver nanoparticles nanocomposite using tea tree oil and silver nitrate vapours. The synthesis process occurs within seconds in microwave plasma at ambient conditions. The resulting nanocomposite exhibits strong interaction between Ag nanoparticles and graphene and demonstrates good electrochemical sensing capability for methyl paraben.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yechang Feng, Wei Hong, Xudong Chen
Summary: An eco-friendly water transfer printing (WTP) method free of primers and activators was developed in this study, using a hydrophobic supramolecular polymer with polydimethylsiloxane (PDMS) segments. The PDMS-PU acted as a pressure-sensitive adhesive to adhere patterns to transfer objects, preventing pattern deformation and prolonging their lifespan. The WTP method produced hydrophobic and self-healing patterns, making it superior to conventional methods.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Miguel Franco, Azadeh Motealleh, Carlos M. Costa, Loic Hilliou, Nikola Perinka, Clarisse Ribeiro, Julio Cesar Viana, Pedro Costa, Senentxu Lanceros-Mendez
Summary: The development of polymer-based conductive inks using nitrogen-doped rGO as the conductive filler has shown enhanced electrical conductivity of graphene, leading to environmentally friendly inks. By optimizing viscosity and adhesion properties, printed films with sheet resistance close to 1 k ohm/sq can be obtained, with the graphene:PVP inks also being biocompatible and nontoxic.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
Bruna F. Goncalves, Gabriela Botelho, Senentxu Lanceros-Mendez, Yury Kolen'ko
Summary: Novel inks consisting of non-toxic reagents and readily available oxide materials were introduced for the screen printing fabrication of Cu(In, Ga)Se-2 thin film photovoltaics, offering a sustainable alternative to traditional vacuum-based deposition methods. Through swift selenization, the resulting films possess phase-pure, uniform, and compact characteristics, with tunable physical properties by adjusting the conditions of the screen printing process and the metal ratios in the inks.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sergey Tkachev, Miguel Monteiro, Joao Santos, Ernesto Placidi, Mohamed Ben Hassine, Pedro Marques, Paulo Ferreira, Pedro Alpuim, Andrea Capasso
Summary: An efficient and inexpensive method has been proposed to produce high-quality graphene dispersions for spray-coating flexible electrodes and assembling touch screen prototypes, overcoming environmental issues associated with hazardous solvents. The combination of liquid-phase exfoliation with shear-mixing and tip sonication techniques in cyrene produces high-concentration graphene inks. The resulting electrodes exhibit low sheet resistance, high optical transmittance, high signal-to-noise ratio, and multi-touch functionality, showcasing the potential integration of LPE-graphene in commercial flexible electronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Fabrizio Marra, Serena Minutillo, Alessio Tamburrano, Maria Sabrina Sarto
Summary: Wearable systems are increasingly attractive in various application areas, with smart clothes based on fabric-integrated strain sensors showing promise but also presenting challenges. The development of smart textiles with high sensitivity, wearability, and stable response is still a challenge, and the use of graphene nanoplatelets in a water-based ink for strain sensors on synthetic fabric shows interesting potential for applications such as monitoring respiratory and heart rates.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Dong Seok Kim, Jae-Min Jeong, Hong Jun Park, Yeong Kyun Kim, Kyoung G. Lee, Bong Gill Choi
Summary: This study developed a highly concentrated and conductive ink based on defect-free graphene through a scalable fluid dynamics process. The screen-printed graphene conductor showed high electrical conductivity and maintained high conductivity under mechanical bending, compressing, and fatigue tests. A printed electrochemical sodium ion sensor with high potentiometric sensing performance was fabricated using the newly developed graphene ink.
NANO-MICRO LETTERS
(2021)
Article
Electrochemistry
M. Azriouil, B. Chhaibi, A. Hrioua, F. Laghrib, A. Farahi, M. Bakasse, S. Lahrich, M. A. EL Mhammedi
Summary: The accumulation of pharmaceutical residues can have negative impacts on the environment and human health. This article describes the development of a carbon paste electrode sensor for detecting ciprofloxacin. The sensor showed high electrochemical performance and successfully monitored ciprofloxacin in various samples.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Analytical
Wei Yin Lim, Choon-Hian Goh, Keenan Zhihong Yap, Narayanan Ramakrishnan
Summary: Irregularities in breathing patterns can be predicted with the help of breath monitor sensors that detect variations in humidity during inhalation and exhalation. Graphene-based RH sensors show excellent sensitivity, stability, and repeatability. By embedding the sensor into a face mask and interfacing it with a microcontroller, different breathing situations can be measured, making it a promising wearable and disposable healthcare technology.
Article
Engineering, Electrical & Electronic
Xuhui Zhang, Xinpu Zhang, Yang Zhang, Yun Liu, Wei Peng
Summary: The proposed optical fiber relative humidity sensor, utilizing multiwalled carbon nanotubes and graphene oxide composite as the humidity-sensitive film, demonstrates high sensitivity and excellent performance. The sensor is based on a multimode interference structure, with the long-range MWCNT-based film showing higher sensitivity and a wide linear measurement range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Nanoscience & Nanotechnology
Adamos Christou, Sihang Ma, Ayoub Zumeit, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Flexible hybrid electronics (FHE) offers potential for fast computation and communication in various applications. This study presents a printed electronics route for integrating ultrathin chips and nanowires-based electronic layers on the same substrate. The results demonstrate the efficacy of the printing technique in achieving this integration and the superior performance of the printed electronic layers.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Manufacturing
Markellos Ntagios, Habib Nassar, Ravinder Dahiya
Summary: The new 3D printer developed in this study combines Fused Filament Fabrication and Direct Ink Write technologies, allowing the printing of multiple materials simultaneously. It expands the range of printable materials and enables the mixing and printing of multi-part materials, including complex ones like two-part rubbers. Experimental results demonstrate the printer's good control even at high printing speeds (up to 20 mm/s).
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Joao Neto, Abhishek Singh Dahiya, Ayoub Zumeit, Adamos Christou, Sihang Ma, Ravinder Dahiya
Summary: Printing technologies are revolutionizing electronics by offering resource-efficient, low-cost, and innovative form factors. However, printing high-performance and stable transistors for large-scale integration remains challenging due to difficulties in printing high-mobility semiconducting materials and the lack of high-resolution printing techniques.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Gaurav Khandelwal, Guanbo Min, Xenofon Karagiorgis, Ravinder Dahiya
Summary: In this study, a fully biodegradable TENG composed of aligned PLLA fibers and chitosan as the active layers was reported. The aPLLA fiber based TENG showed superior performance due to better helix chain conformation. The TENG demonstrated excellent mechanical stability and produced a high output power density. This approach provides an attractive green energy harvesting solution for powering portable devices without concerns of electronic waste management.
Article
Engineering, Electrical & Electronic
Ajay Beniwal, Dina Anna John, Ravinder Dahiya
Summary: This letter presents a flexible and disposable humidity sensor based on PEDOT:PSS. The sensing layer is developed by drop casting PEDOT:PSS on screen printed graphene-carbon-ink-based IDEs on paper substrate. The sensor exhibits substantial response (118.5% at 90%RH) with response/recovery time as 70/30 s in a wide humidity range (25%RH-90%RH) at room temperature. The sensor shows promising applications in skin moisture monitoring, environmental humidity monitoring, and noncontact switching in healthcare and agriculture.
IEEE SENSORS LETTERS
(2023)
Article
Engineering, Multidisciplinary
Innocent D. Lubangakene, Bal Virdee, Renu Karthick Rajaguru Jayanthi, Priyanka Ganguly
Summary: This paper presents a wireless measurement method for analyzing electrolytes in sweat to determine the level of dehydration, cystic fibrosis, and the presence of illicit drugs. The study used synthetic sweat that mimicked actual human sweat, composed of a composite mixture of metabolites and minerals. The effect of ambient temperature on the permittivity measurements of different sweat solutions was examined across a frequency range of 400 MHz to 10.4 GHz. This information is crucial for the development of wireless radio frequency (RF) non-invasive biosensors.
RESULTS IN ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Ajay Beniwal, Priyanka Ganguly, Rahul Gond, Brajesh Rawat, Chong Li
Summary: This study presents a flexible and disposable NO2 gas sensor based on PEDOT:PSS, which operates at room temperature. The sensor exhibits significant response rate and good repeatability and reproducibility. The findings suggest that this sensor holds promise for various applications.
IEEE SENSORS LETTERS
(2023)
Article
Optics
Bhavani Prasad Yalagala, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Disposable devices for reliable measurements have gained interest recently. This study presents degradable UV photodetectors made of ZnO nanowires on flexible chitosan substrate. The device exhibits excellent photo response, mechanical flexibility, and thermal stability. Biodegradability studies show fast degradation in deionized water compared to PBS solution. These findings suggest the potential for environmentally-friendly and cost-effective fabrication of wearable and disposable sensing systems.
OPTO-ELECTRONIC ADVANCES
(2023)
Article
Engineering, Multidisciplinary
Renu Karthick Rajaguru Jayanthi, Bal S. Virdee, Innocent Lubangakene, Priyanka Ganguly, Dion Mariyanayagam
Summary: This article presents the importance of considering temperature in the analysis of the permittivity of glucose solutions. The study shows that body temperature can affect the accuracy of blood glucose measurements and provides an accurate analytical expression that considers the temperature. The findings enable the design of accurate noninvasive glucose monitoring devices.
RESULTS IN ENGINEERING
(2023)
Proceedings Paper
Engineering, Manufacturing
Rudra Mukherjee, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Additive manufacturing is an efficient method for the development of flexible electronics, but faces challenges in terms of reliability in repeated bending conditions. This paper assesses the resistance and endurance of screen-printed silver interconnects on different substrates, finding a significant dependence on the substrate. This analysis is important for applications such as smart tags.
2022 IEEE INTERNATIONAL CONFERENCE ON FLEXIBLE AND PRINTABLE SENSORS AND SYSTEMS (IEEE FLEPS 2022)
(2022)
Article
Automation & Control Systems
Adamos Christou, Radu Chirila, Ravinder Dahiya
Summary: The advancement of volumetric display technologies and haptic feedback devices have paved the way for a more immersive and interactive virtual reality experience, allowing users to interact with virtual objects in mid-air without the need for special headwear or handheld peripherals.
ADVANCED INTELLIGENT SYSTEMS
(2022)
Article
Chemistry, Analytical
Mengmeng Guo, Na Luo, Yueling Bai, Zhenggang Xue, Qingmin Hu, Jiaqiang Xu
Summary: A porous heterostructure WO3-C/In2O3 was designed and prepared for a miniature H2 sensor, which showed higher response value, lower operating temperature, fast response-recovery speed, and low limit of detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Feng Hu, Hui Hu, Yuting Li, Xiaohui Wang, Xiaowen Shi
Summary: Arsenic contamination in water bodies is a significant health risk. This study developed a chitosan-catechol modified electrode for rapid and accurate detection of trace amounts of arsenic. The modified electrode demonstrated good detection capability and resistance to ionic interference, making it suitable for in situ detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Yantao Zhang, Qian Liu, Tao Tian, Chunhua Xu, Pengli Yang, Lianju Ma, Yi Hou, Hui Zhou, Yongjun Gan
Summary: In this study, a lysosome-targeting buffering fluorogenic probe (Lyso-BFP) was designed and synthesized, demonstrating excellent photostability, pH specificity, and responsiveness to lysosomal acidification in living cells. The performance of Lyso-BFP in pH sensing was attributed to the inhibition of the photo-induced electron transfer process. Lyso-BFP allowed for wash-free imaging and long-term real-time monitoring of lysosome pH changes based on its off-on fluorescence behavior and buffer strategy.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Wei Cai, Wenbo Sun, Jiayue Wang, Xiaokui Huo, Xudong Cao, Xiangge Tian, Xiaochi Ma, Lei Feng
Summary: In this study, a near-infrared fluorescent probe HCBG was developed for imaging of alpha-GLC. HCBG exhibited excellent selectivity and sensitivity towards alpha-GLC in complex bio-samples, and showed good cell permeability for in situ real-time imaging. Through the high-throughput screening system established by HCBG, a natural alpha-GLC inhibitor was successfully isolated and identified. This study provides a novel fluorescence visualization tool for discovering and exploring the biological functions of diabetes-related gut microbiota, and a high-throughput screening approach for alpha-GLC inhibitor.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Trey W. Pittman, Xi Zhang, Chamindie Punyadeera, Charles S. Henry
Summary: Heart failure is a growing epidemic and a significant clinical and public health problem. Researchers have developed a portable and affordable diagnostic device for heart failure that can be used at the point-of-care, providing a valid alternative to current diagnostics approaches.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Anders O. Tjell, Barbara Jud, Roland Schaller-Ammann, Torsten Mayr
Summary: An optical hydrogen peroxide sensor based on catalytic degradation and the detection of produced oxygen is presented. The sensor offers higher resolution and better sensitivity at lower H2O2 concentrations. By removing O2 from the sample solution, a more sensitive O2 sensor can be used for measurement. The sensor has been successfully applied in a flow-through cell to measure H2O2 concentration in different flow rates.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Seong Jae Kim, Ji-hun Jeong, Gaabhin Ryu, Yoon Sick Eom, Sanha Kim
Summary: Surface-enhanced Raman spectroscopy (SERS) is a high-sensitivity, label-free detection method with various analytical applications. Researchers have developed a hydrophobic SERS substrate based on engineered carbon nanotube arrays (CNT-SERS) and studied the role of structural design at both micro and nanoscales. The substrate demonstrated controlled self-enrichment capability and enhanced sensitivity, with a significant increase in the SERS signal. The study also proposed a theoretical model and a concentration strategy inspired by plants for analyte deposition on microarrays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Dan Zhao, Renjun Jiang, Xiaoqiang Liu, Subbiah Alwarappan
Summary: In this study, a novel ternary composite material was constructed by assembling cerium vanadate nanorods on reduced graphene oxide-microcrystalline cellulose nanosheets, and it was used for real-time monitoring of the concentration of superoxide anions in vivo. The ternary composite showed excellent conductivity, large surface area, and abundant active sites, leading to a wider linear range, high sensitivity, low detection limit, and fast response time for superoxide anion detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Tengfei Wang, Liwen Wang, Guang Wu, Dating Tian
Summary: In this study, a covalent organic framework material TaTp-COF with porous and uniform spheres was successfully prepared via hydrothermal reaction, and it was found to significantly enhance the aggregation-induced emission (AIE) of berberine. The unique emission properties of berberine on TaTp-COF were studied and utilized for the sensitive detection of berberine.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Lin Li, Yilei Ding, Lei Xu, Shuoran Chen, Guoliang Dai, Pengju Han, Lixin Lu, Changqing Ye, Yanlin Song
Summary: In this study, a novel TTI based on a ratiometric fluorescent nanosensor is designed, which has the advantages of high accuracy and low cost. Experimental and theoretical investigations confirm its pH responsiveness and demonstrate its good sensitivity and reliability. By monitoring the total volatile basic nitrogen, this TTI can accurately predict food spoilage and can be adaptively modified for different types of food. The TTI based on this nanosensor enables visual monitoring of food quality.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Fangju Chen, Xueting Wang, Wei Chen, Chenwen Shao, Yong Qian
Summary: Lung cancer is the second most common malignant tumor worldwide. Drug resistance in lung cancer leads to treatment failure and recurrence in majority of patients. This study developed a fluorescent prodrug that can be activated in cancer cells to release drugs, and its signal can be tracked by imaging. It shows a unique autophagy-driven ferroptosis effect, indicating its potential for targeting drug-resistant cancer cells.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Weichao Li, Qiming Yuan, Zhangcheng Xia, Xiaoxue Ma, Lifang He, Ling Jin, Xiangfeng Chu, Kui Zhang
Summary: This study developed a high-performance gas sensor for formaldehyde detection by modifying ZnSnO3 with ZnO QDs and SnO2 QDs. The modified sensor showed improved sensing response and lower working temperature. The presence of ZnO QDs formed rich heterojunctions, increased surface area, and provided oxygen deficiency for formaldehyde sensing reaction, thus enhancing the sensor performance. This research provides an alternative method to enhance the sensing properties of MOS by QDs modification.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Joung-Il Moon, Eun Jung Choi, Younju Joung, Jin-Woo Oh, Sang-Woo Joo, Jaebum Choo
Summary: A novel nanoplasmonic substrate was developed for biomedical applications, which showed strong hot spots for detecting biomarkers at low concentrations. The substrate, called AuNPs@M13, was made by immobilizing 60 nm gold nanoparticles onto the surface of an M13 bacteriophage scaffold. It demonstrated higher sensitivity and lower limit of detection compared to commercially available assays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Ning Li, Ya Zhang, Ying Xu, Xiaofang Liu, Jian Chen, Mei Yang, Changjun Hou, Danqun Huo
Summary: The molecular subtype of breast cancer guides treatment and drug selection. Invasive tests can promote cancer cell metastasis, so the development of high-performance, low-cost diagnostic tools for cancer prognosis is crucial. Liquid biopsy techniques enable noninvasive, real-time, dynamic, multicomponent, quantitative, and long-term observations at the cellular, genetic, and molecular levels. A Cu-Zr metal-organic framework (MOF) nanoenzyme with monatomic Cu attachment has been synthesized and proven to have high catalytic performance. The sensor constructed using this nanoenzyme shows potential for accurate classification of breast cancer serum samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Jeongmin Kim, Hyemin Kim, Seunghyun Park, Hyeonaug Hong, Yong Jae Kim, Jiyong Lee, Jaeho Kim, Seung-Woo Cho, Wonhyoung Ryu
Summary: This study presents a method to fabricate independently functioning microneedle (MN) electrodes with narrow intervals for high precision electrochemical sensing. The optimized mixture of photocurable polymer and single-wall carbon nanotubes was used to mold single composite MNs, which were then attached to pre-patterned electrodes. Plasma etching and electropolymerization were performed to enhance the electrochemical activity, and Prussian blue and glucose oxidase were electrodeposited on the MNs for glucose detection. The MN electrodes showed good sensitivity and linearity, and the feasibility of glucose detection was demonstrated in an in vivo mouse study.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
