Article
Chemistry, Physical
Dimitrios Kaltsas, Panagiotis Pappas, Leonidas Tsetseris
Summary: The researchers utilized Density Functional Theory calculations to investigate the mechanisms of forming 2D-Si sheets functionalized with iodine atoms (SiI) or acetonitrile molecules [Si(MeCN)] from a layered CaSi2 precursor. The results revealed the adsorption reactions that lead to the exfoliation of 2D materials with intriguing structural and electronic properties, such as quasi-one-dimensional silicon chains and a Dirac-like cone in the energy band diagram.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mingxin Zhang, Kai Liu, Jin Xu, Pengzhen Wang, Jianhua Sun, Wei Ding, Cong Wang, Kewei Zhang
Summary: This study presents a breath sensor that can detect ppb-level ammonia at room temperature. The sensor is constructed based on a soft-hard interface design of biocompatible seaweed fabric and nanosheet-assembled bismuth oxide architectures. It exhibits superior characteristics for ammonia detection, including ultrahigh response, short response/recovery time, small detection limit, and remarkable anti-interference. Furthermore, the sensor shows a noticeable response to the exhaled breath of a patient with Helicobacter pylori infection and can be connected to an alarm system for warning about ammonia levels.
Article
Biophysics
Shulin Chen, Yan Dong, Tzu-Li Liu, Jinghua Li
Summary: This work presents a novel strategy for fabricating waterproof and flexible biochemical sensors with active electronic components that can operate continuously in liquid environments. The ultrathin encapsulation layer derived from monocrystalline Si nanomembranes enables the continuous operation of field-effect transistors for chemical sensing, showing great potential for future waterproof and scalable biochemical sensors with active functionalities. The excellent stability in liquid environments and pH sensing performance of these transistors suggest broad applicability in biomedical research, food science, and advanced healthcare.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Khengdauliu Chawang, Sen Bing, Jung-Chih Chiao
Summary: The development of planar and flexible electrochemical pH sensors with iridium oxide sensing film for viscous solutions is investigated in this study. The study analyzes the effects of salt interference and solution viscosity on pH-sensing responses. The findings indicate that these planar electrodes can provide predictable pH deviations when measuring pH in viscous solutions.
Article
Materials Science, Multidisciplinary
Stefano Lai, Ylea Vlamidis, Neeraj Mishra, Piero Cosseddu, Vaidotas Miseikis, Pier Carlo Ricci, Valerio Voliani, Camilla Coletti, Annalisa Bonfiglio
Summary: This paper introduces a novel chemical sensor that combines organic floating gate field-effect transistors with functional graphene electrodes, creating flexible and transparent sensor devices. By non-covalently functionalizing graphene, it achieves chemical responsivity without affecting its electronic and optical properties. These devices have the potential to develop a range of chemosensing capabilities by varying the chemical specificity of the immobilized receptors.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Lasse Hunger, Loai Al-Sheakh, Dzmitry H. Zaitsau, Sergey P. Verevkin, Andreas Appelhagen, Alexander Villinger, Ralf Ludwig
Summary: This research reveals that a carboxyl-functionalized ionic liquid exhibits three types of hydrogen bonding, including single hydrogen bonds between cation and anion, as well as single and double hydrogen bonds between cations of like charge. Through various experimental and computational methods, the hydrogen bonding in the solid, liquid, and gaseous states of the ionic liquid is analyzed and characterized.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Ai-Huei Chiou, Jun-Luo Wei, Ssu-Han Chen
Summary: A novel SERS-based probe utilizing SiNW arrays with AgNPs was developed for capturing Zn2+ ions by BSA. The composite interfaces showed significant Raman scattering enhancement, indicating potential for label-free biosensors with high sensitivity. The specific SERS spectra of BSA and ZnSO4 conjugations suggest promising applications in biosensing.
Article
Chemistry, Physical
Yuanchuan Ma, Jiao Wei, Jialong Zhu, Yang Hu, Yuquan Cai, Jieyuan Zheng, Hong Fan
Summary: This study presents a simple method to prepare pH-responsive silica particles modified by abundant carboxyl groups (SiO2-COOH) from bio-based ricinoleic acid. The hierarchical structure of SiO2-COOH can easily construct roughness for special wettability, achieving robust superhydrophobicity on different substrates. The modified fabrics and sponges show efficient separation of different oil-water mixtures within seconds at different pH, and the SiO2-COOH exhibits outstanding adsorption capacity to heavy metal ions and organic dyes.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Bao-Tong Ding, Chao Han, Guang-Hua Cui
Summary: Two new metal-organic frameworks (MOFs) were synthesized under hydrothermal conditions, showing high thermal and pH stability and serving as luminescence probes for sensing acetylacetone and Fe3+ ions.
INORGANICA CHIMICA ACTA
(2021)
Article
Spectroscopy
Muthaiah Shellaiah, Kien Wen Sun
Summary: In this study, a cysteamine functionalized nanodiamond was conjugated to gold nanoparticles to form a novel nanomaterial for enhanced colorimetric detection of Cr3+ at pH 6. The nanomaterial showed superior sensory response to Cr3+ compared to other ions and the response was reversible up to 4 cycles with the addition of EDTA. Spiked real water experiments demonstrated the improved sensing of Cr3+ at pH 6, which was consistent with the ICP-mass data.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Joong San Nah, Sharat Chandra Barman, Md Abu Zahed, Md. Sharifuzzaman, Hyosang Yoon, Chani Park, Sanghyuk Yoon, Shipeng Zhang, Jae Yeong Park
Summary: A wearable sweat sensor based on MXene and graphene was developed, with a 3D printed microfluidic system for noninvasive cortisol detection in human sweat. The sensor exhibited linear detection with a low limit of 88 pM.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Md Sharifuzzaman, Md Abu Zahed, Sudeep Sharma, S. M. Sohel Rana, Ashok Chhetry, Young Do Shin, Md Asaduzzaman, Shipeng Zhang, Sanghyuk Yoon, Xue Hui, Hyosang Yoon, Jae Y. Park
Summary: This study introduces a cost-effective fluoropolymer, PDFE, and successfully prepares high-performance, wearable CNFs material through specific chemical processing and carbonization methods, which is applied to a skin-compatible electronic tattoo for monitoring biopotentials and achieving human-machine interface operation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Biophysics
Sanghyuk Yoon, Hyosang Yoon, Md Abu Zahed, Chani Park, Dongkyun Kim, Jae Yeong Park
Summary: A novel multifunctional hybrid skin patch was developed for sweat glucose level analysis and simultaneous ECG monitoring, with pH and temperature sensors integrated for biosensor calibration. The fabricated patch exhibited excellent linearity and sensitivity for glucose detection, as well as reliable monitoring of ECG waveforms. By integrating all sensors onto a single patch, it provides advanced glycemic control and continuous ECG monitoring for smart management of chronic diseases and healthcare applications.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Physical
M. Toyabur Rahman, S. M. Sohel Rana, M. Abu Zahed, Sanghyun Lee, Eui-Sung Yoon, Jae Yeong Park
Summary: This study introduces MOF-derived nanomaterials to enhance the energy harvesting performance of TENG, paving the way for new tribomaterials.
Article
Engineering, Electrical & Electronic
Chani Park, Hyosang Yoon, Md Abu Zahed, Shipeng Zhang, Sanghyuk Yoon, Dongkyun Kim, Daeheum Kim, Jaeyeong Park
Summary: A highly stable Ca2+ ion-selective sensor was developed by depositing a PEDOT:PSS layer on a carbon paste electrode and treating it with ethylene glycol. The sensor exhibited excellent electrochemical properties, high sensitivity, and rapid response, making it suitable for long-term monitoring of biochemical compounds.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
M. Toyabur Rahman, S. M. Sohel Rana, M. Salauddin, M. Abu Zahed, Sanghyun Lee, Eui-Sung Yoon, Jae Yeong Park
Summary: In this study, a novel wearable and stretchable triboelectric nanogenerator (TENG) was fabricated using metal-organic framework-derived nanoporous cobalt oxide (NPCO) and MXene materials. The TENG showed high power density and excellent sensitivity, making it suitable for self-powered wearable devices and biomechanical energy harvesting.
Article
Chemistry, Physical
Md Salauddin, S. M. Sohel Rana, Md Sharifuzzaman, Sang Hyun Lee, Md Abu Zahed, Young Do Shin, Sookyeong Seonu, Hye Su Song, Trilochan Bhatta, Jae Yeong Park
Summary: In this study, a laser-carbonized MXene/ZiF-67 nanocomposite-based intermediate layer is introduced to enhance the output performance of triboelectric nano generators (TENGs). Through optimization of different ratios, laser powers, and laser speeds, the intermediate layer significantly improves the power density of the contact mode TENG and enables the non-contact mode TENG to have high charge density and stable output performance at a distance of 2 cm.
Article
Nanoscience & Nanotechnology
Dongkyun Kim, Ashok Chhetry, Md Abu Zahed, Sudeep Sharma, Seonghoon Jeong, Hyesu Song, Jae Yeong Park
Summary: In this study, a highly sensitive and reliable piezoresistive strain sensor based on polyhedral cobalt nanoporous carbon (Co-NPC)-incorporated laser-induced graphene (LIG) was fabricated for wearable smart healthcare applications. The sensor exhibited outstanding sensitivity and stability, with a detection limit of 0.02% and excellent performance even under high strain conditions. The sensor's potential applications include electronic skins, human-machine interactions, and soft robotics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Md Sharifuzzaman, Md Abu Zahed, Md Selim Reza, Md Asaduzzaman, SeongHoon Jeong, Hyesu Song, Dong Kyun Kim, Shipeng Zhang, Jae Y. Park
Summary: This article presents an electrochemical-electrophysiological multimodal biosensing patch based on MXene/fluoropolymer nanofiber-derived hierarchical porous TiO2 nanocatalyst interconnected 3D fibrous carbon nanohybrid electrodes. The nanohybrid electrode is produced via a one-step laser carbonaceous thermal oxidation, resulting in excellent electroconductivity, rich active edges, and abundant support for enzyme immobilization. The nanohybrid modified biosensing patch integrated into textile demonstrates simultaneous and precise monitoring of sweat glucose with pH adjustment and electrocardiogram signals. This novel approach opens up possibilities for controlled investigations, functionalization, design options, and mass manufacturing capabilities in real-world applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Biophysics
Md Asaduzzaman, Md Abu Zahed, Md Sharifuzzaman, Md Selim Reza, Xue Hui, Sudeep Sharma, Young Do Shin, Jae Yeong Park
Summary: A wearable electrochemical biosensor for perspiration analysis was developed using a functionalized hybridized nanoporous carbon (H-NPC)-encapsulated flexible 3D porous graphene-based epidermal patch. The sensor could monitor sweat glucose, lactate, pH, and temperature with high sensitivity and detection limit.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Sudeep Sharma, Gagan Bahadur Pradhan, Ashok Chhetry, Kumar Shrestha, Trilochan Bhatta, Shipeng Zhang, Dongkyun Kim, Seonghoon Jeong, Youngdo Shin, Md. Abu Zahed, Xue Hui, Jae Yeong Park
Summary: A flexible supercapacitive pressure sensor based on a novel reversible ion pumping mechanism is reported, which significantly increases the pressure sensitivity over a broad linear range. The sensor consists of a lower concentration ionic nanofibrous membrane between two graphene-polymer nanocomposite electrolyte films, triggering a high electrical double layer capacitance under external stimuli. The sensor exhibits an ultra-high sensitivity of 9029 kPa-1 over a wide linear range (0-100 kPa) with an outstanding pressure resolution of 0.446%. Additionally, a wireless fitness tracker system is successfully demonstrated by integrating the sensor, which can monitor the food consumption and posture of users to improve their lifestyle.
Article
Chemistry, Physical
S. M. Sohel Rana, M. Toyabur Rahman, Md Abu Zahed, Sang Hyun Lee, Young Do Shin, Sookyeong Seonu, Dongkyun Kim, M. Salauddin, T. Bhatta, K. Sharstha, Jae Yeong Park
Summary: In this study, a stretchable, humidity-resistant, and high-performance multilayered TENG (M-TENG) is developed for self-powered biomotion and tactile sensing applications. The M-TENG showed excellent performance including superior power density, sensitivity, humidity resistance, and stretchability compared to previously reported TENGs. Practical applications were successfully demonstrated, highlighting the potential of M-TENG in wearable energy harvesters, self-powered sensing systems, and human-machine interfaces.
Proceedings Paper
Engineering, Electrical & Electronic
Dongkyun Kim, Ashok Chhetry, Md Abu Zahed, Sudeep Sharma, Hyesu Song, Chani Park, Sang Hyun Lee, Jae Yeong Park
Summary: We have proposed a piezoresistive strain sensor based on polyhedral structured nanoporous cobalt oxide coated laser-induced graphene for smart wearable electronics. The sensor exhibits outstanding sensitivity and stability, with ultra-high sensitivity and detection limit in different strain ranges. The sensor's performance has been successfully applied in wearable healthcare applications.
2022 IEEE 35TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS CONFERENCE (MEMS)
(2022)
Article
Engineering, Electrical & Electronic
Shipeng Zhang, Ashok Chhetry, Md Abu Zahed, Sudeep Sharma, Chani Park, Sanghyuk Yoon, Jae Y. Park
Summary: Flexible and stretchable multifunctional sensors are in high demand for precise monitoring of human physiological health indicators in next-generation electronics. The integration of multiple sensors into a common substrate for simultaneous detection without interference is a major challenge.
NPJ FLEXIBLE ELECTRONICS
(2022)
