{"title":"Ultralight Weight Piezoresistive Spongy Graphene Sensors for Human Gait Monitoring Applications","authors":"Debarun Sengupta, A. Kottapalli","doi":"10.1109/NEMS50311.2020.9265580","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265580","url":null,"abstract":"This work reports a facile method of fabricating ultralight weight (density of 0.305 g/cm3) and squeezable microporous graphene-PDMS piezoresistive sensors for human gait monitoring applications. The sensor reported in this work demonstrates piezoresistivity by utilizing the conductive domain discontinuity mechanism demonstrated by multilayer graphene nanoflakes populating the inner pore walls of microporous PDMS sponges. Quasi-static compressive strain characterization experiments conducted on the sensor revealed a linear response with a gauge factor of 8.77 for compressive strains up to 9.5%. Two identical graphene-PDMS sponge sensors embedded into a pair of soft shoe-soles were used to demonstrate comprehensive real-time gait monitoring, which includes pressure profiling of the heels of both the legs.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"228 1","pages":"120-123"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74988965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Annesha Mazumder, Syed Azeemuddin, T. Sau, P. Bhimalapuram
{"title":"Study of Gold Particles in HFSS with Varying Physical Parameters and Arrangements","authors":"Annesha Mazumder, Syed Azeemuddin, T. Sau, P. Bhimalapuram","doi":"10.1109/NEMS50311.2020.9265619","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265619","url":null,"abstract":"Radio Frequency (RF) based sensors have shown great potential for the qualitative and quantitative analysis of different chemical and biological entities. In this work, the feasibility of performing RF based sensing by using gold particles has been explored with the help of the computational tool, HFSS (High Frequency Structure Simulator). The analysis is performed for an Interdigitated Capacitor based sensor. Various physical parameters of cylindrical gold particles such as radius and thickness have been varied, and the electrical parameters of the sensor systems have been studied. In particular, the reflection coefficients have been determined for various cases. In addition to the physical parameters, different configurations of the gold particles such as their linear and non-linear arrangements have been analyzed. The analyses offer promising results for the development of efficient sensing platforms.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"151 1","pages":"529-532"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76117275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A MEMS Based Electrochemical Rotational Vibration Sensor","authors":"Bowen Liu, Junbo Wang, Deyong Chen, Jian Chen, Chao Xu, Tian Liang, Wenjie Qi, Xu She","doi":"10.1109/NEMS50311.2020.9265612","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265612","url":null,"abstract":"A novel electrochemical rotational vibration sensor is proposed in this study, which is based on Micro-electric-mechanical System (MEMS) technology, capable of measuring low-frequency angular acceleration and velocity. In this study 1) a calculation model for the sensor designed was built, and the key structure parameters were calculated and optimized by the multi-field coupling numerical simulation method; 2) Microelectrode is designed and fabricated, and the most simplified device package is implemented, reporting the angular acceleration sensitivity higher than 2 V/(rad/s2), and the angular velocity sensitivity higher than 14 V/(rad/s) below 1 Hz without electronic circuit compensation. Compared to conventional counterparts, the micro sensor proposed in this study is featured with simple electrode structure and fabrication process, with the potential of mass fabrication of devices with high consistency.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"60 1","pages":"63-66"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84944058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tsung-Han Lu, N. Chiang, Chien-Jui Huang, P. Gopinathan, Hsiu-Chi Tu, Yi-Cheng Tsai, Y. Shan, S. Hung, Gwo-Bin Lee
{"title":"An integrated microfluidic platform for cholangiocarcinoma diagnosis from clinical bile juice samples by utilizing multiple affinity reagents","authors":"Tsung-Han Lu, N. Chiang, Chien-Jui Huang, P. Gopinathan, Hsiu-Chi Tu, Yi-Cheng Tsai, Y. Shan, S. Hung, Gwo-Bin Lee","doi":"10.1109/NEMS50311.2020.9265566","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265566","url":null,"abstract":"Cholangiocarcinoma (CCA) is a lethal disease owing to its difficulty to be diagnosed at early stages and lack of effective treatment. To improve the accuracy of early diagnosis of CCA, one of the promising approaches is to use CCA-specific affinity reagents to detect CCA cells by liquid biopsy. In this study, bile juice, a body fluid close to lesions, was used as a clinical sample for CCA cell isolation and detection. Moreover, a novel microfluidic chip was designed and fabricated to detect CCA cells in the bile juice by using three types of affinity reagents. Experimental results showed that the three affinity reagents could capture CCA tumor cells in patients’ bile juice (with a volume of only 3 mL) within 120 min. This microfluidic system may serve as a promising tool for detecting CCA in clinical settings.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"8 1","pages":"261-264"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87518774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amit Singh, Seunghan Lee, Hoonkyung Lee, Hiroshi Watanabe
{"title":"Dielectric Constant and van der Waals Interlayer Interaction of MoS2-Graphene Heterostructures","authors":"Amit Singh, Seunghan Lee, Hoonkyung Lee, Hiroshi Watanabe","doi":"10.1109/NEMS50311.2020.9265634","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265634","url":null,"abstract":"The dielectric screening is one of the most fundamental properties of 2D materials which is used to characterize electronic properties such as storage capacity of charge or energy. We numerically investigate three potential heterostructures of MoS2-Graphene and their corresponding interlayer interactions. Applying a density-functional approach to the lowest energy structure of the interlayer, we find that, within a lower field regime (≲ 10 MV/cm), the dielectric constant is independent of the vertical electric field and dependent of the interlayer distance and stacking pattern of heterostructures composed of MoS2 and Graphene. From the calculation results of the induced charge throughout the heterostructure, we find how the van der Waals interaction influences the dielectric constant.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"391 1","pages":"490-494"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77695125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Ibrahim, Satyanarayana Moru, Sung-Min Kang, S. Yin, Yuncong Chen, Liang Dong
{"title":"Capturing subtle changes during plant growth using wearable mechanical sensors fabricated through liquid-phase fusion","authors":"H. Ibrahim, Satyanarayana Moru, Sung-Min Kang, S. Yin, Yuncong Chen, Liang Dong","doi":"10.1109/NEMS50311.2020.9265565","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265565","url":null,"abstract":"This paper reports the development of a novel mechanical sensing elastomer that leverages the advantages of graphene, and multi-walled carbon nanotubes (MWCNTs) into Ecoflex and integrated using a unique liquid phase fusion process. The graphene-MWCNT elastomer is used to form a stretchable sensor for monitoring subtle changes of the plant growth over multiple days in a field condition.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"1 1","pages":"571-574"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79597621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Module-level Weathering and Durability Testing on Silver Nanowire Transparent Conductors","authors":"Chiao-Chi Lin, Bo-Ju You, Yu-Xuan Yang, I. Tseng","doi":"10.1109/NEMS50311.2020.9265599","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265599","url":null,"abstract":"We adopt a pseudo-module methodology for investigating the degradation behaviors of silver nanowire (AgNW) transparent conductors (TC). The pseudo-module allows assembly and disassembly for accessing TC during aging test without causing artificial damage to the AgNWs. Aging tests on the AgNWs inside pseudo-module were performed under ultraviolet (UV) irradiation at elevated temperature and damp heat conditions. There was no deterioration concerning electrical DC conductivity for both UVA/75ºC and damp heat aging conditions after aging for 69 days and 100 days, respectively. However, microscopy and spectroscopy results indicated that damp heat aging resulted in significant damage to the morphologies of AgNWs, inferring the importance of encapsulation to the stability of pristine AgNWs inside modules. Morphological and junctional change of AgNWs networks caused the decrease in optical transmittance of TC. The UVA/75ºC aging results showed early sign of sulfidation after aging for 100 days. Electrical stress tests by applying stepwise current were conducted. The failure mode of both pristine AgNW TC and AgNW TC inside pseudo-module were identical. However, the AgNW TC inside pseudo-module generated higher heating temperature. Preliminary outdoor exposure has been conducted by our research team, and comprehensive investigation will be carried out in the near future.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"27 1","pages":"9-13"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79839976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electrical modeling of Copper and Mixed Carbon bundles as a composite for 3D Interconnect applications","authors":"M. Rao","doi":"10.1109/NEMS50311.2020.9265633","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265633","url":null,"abstract":"Generally Copper filled through silicon vias (TSVs) are considered effective for 3D IC applications, however Copper (Cu) filled interconnects are not devoid of electrical and mechanical problems. Carbon nanotubes (CNTs) are considered more robust, with high current carrying capacity, and mechanically tough compared to other materials considered. The fabrication of the Cu/CNTs in the TSVs are investigated thoroughly and a process to consistently grow vertical CNTs with Cu filling post CNT growth in a TSVs is established. The grown CNTs are observed to be mixed bundles comprising of Single Walled Nanotubes (SWNT), and Multiwalled Nanotubes (MWNT) in different proportions. The paper presents the designed closed loop surface current density, bidirectional vertical delay and crosstalk models for Mixed Carbon bundles (MCB) with Copper filled TSV interconnects. The developed models are expressed as a function of Cu filling ratio, SWNT/MWNT proportion in the mixed carbon bundles, TSV geometry including tapered profile of the via, and the diameter of CNTs. The current density, delay and S-parameters are analyzed using the developed models for a standard TSV design. The surface current density model indicates consistent current density along the surface, for higher proportion of SWNT in the MCB, with minimum Copper in the via. The cross talk models suggests similar transmission and reflection properties for MCB/Cu composite when compared to Cu based TSVs. The delay models suggests improvement in the signal propagation for composite consisting of Cu, and MCB with higher proportion of MWNTs. The models are considered a useful tool for 3D IC designers, especially towards placement and routing stage of the chip design.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"14 1","pages":"495-499"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83919244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On-skin Based Soft Triboelectric Nanogenerator for Electronics Skin","authors":"Jiwon Park, Da Eun Kim, Youn Tae Kim","doi":"10.1109/NEMS50311.2020.9265583","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265583","url":null,"abstract":"Currently, with the transition to the ubiquitous era, next-generation electronic devices such as artificial electronic skin, wearable computers, and flexible displays have been developed that are light and portable and can be easily applied to human life. Therefore, in order to supply power to such devices, the importance for the development of an energy devices is increasing. To address this issue, a stretchable on-skin based triboelectric nanogenerator (TENG) that contacts to the skin and can generate energy from the free movement is proposed. It is easier to manufacture than the previously reported body-attachable TENG and is ultrathin with a total thickness of 200 μm. As an electrode, the conductive thread was formed in a winding pattern on an elastomer substrate, showed high elasticity of 100% or more, and stability without distortion even under repeated strain. It adhered to the back hand to generate an electrical output of 280 V and 12 μA, and the test on the electronic drive demonstrated its practical applicability. The on-skin based TENG may be utilized as a stretchable and flexible energy device that can replace the conventional bulk battery, and has the potential to be an important core technology in combination with E-skin and wearable sensors.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"15 1","pages":"273-276"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86031132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhou Zheng, Naeun Kim, Jiaqi Wang, W. Wong, J. Yeow
{"title":"Inkjet-Printed Capacitive Micromachined Ultrasonic Transducer (CMUT) for Moisture Sensing","authors":"Zhou Zheng, Naeun Kim, Jiaqi Wang, W. Wong, J. Yeow","doi":"10.1109/NEMS50311.2020.9265591","DOIUrl":"https://doi.org/10.1109/NEMS50311.2020.9265591","url":null,"abstract":"This study presents a miniaturized CMUT- based moisture sensor that is functionalized by the inkjet printing technique. The multi-cell CMUT designed in a hexagonal cell arrangement was fabricated. A graphene oxide sensing film was inkjet-printed on the surface of the CMUT for adsorption of water molecules. The sensitivity, repeatability, and hysteresis characteristics of the moisture sensor were tested. The inkjet-printed CMUT showed a significantly reduced hysteresis level than our previous drop- casted devices.","PeriodicalId":6787,"journal":{"name":"2020 IEEE 15th International Conference on Nano/Micro Engineered and Molecular System (NEMS)","volume":"38 1","pages":"106-19"},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88030376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}