2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO)最新文献_第5页

Hydrodynamic thermal transport in suspended graphene ribbons 悬浮石墨烯带中的流体动力热输运

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117364

A. Majee, Z. Akšamija

{"title":"Hydrodynamic thermal transport in suspended graphene ribbons","authors":"A. Majee, Z. Akšamija","doi":"10.1109/NANO.2017.8117364","DOIUrl":"https://doi.org/10.1109/NANO.2017.8117364","url":null,"abstract":"The steady-state behavior of thermal transport in bulk and nanostructured semiconductors has been widely studied, both theoretically [4] and experimentally [1], with an intense focus on 2-dimensional materials such as graphene and graphene nanoribbons (GNRs) in recent years. The effect of ribbon size (width and length) and temperature on steady-state thermal conductivity is now well understood. On the other hand, fast transients and frequency response of thermal conduction, sometimes called dynamical thermal conductivity has been given less attention. The response of thermal conductivity to rapidly varying heat sources may become more crucial in the future, especially with the constant growth in the clock frequencies in microprocessors and increase in giga- and terahertz applications of semiconductor devices. It has been theoretically predicted in 3-D materials that thermal conductivity in response to a time-varying temperature gradient starts decaying when the frequency of the applied heat source (Ω) exceeds a certain cut-off frequency üc, which was found to be related to the inverse of the average phonon relaxation time TC. The phonon relaxation time in bulk semiconductors such as silicon is short, on the order of 2–10 ps, leading to thermal conductivity that is independent of frequency up to very high iic exceeding 10 GHz. In contrast, 2-D materials like graphene have much longer phonon relaxation times, especially below room temperature. Therefore, in suspended graphene and wide graphene ribbons, Ω c can be expected to be much lower than that of silicon. Moreover, the presence of strong momentum-conserving normal phonon-phonon processes, overshadowing the momentum-destroying umklapp processes in graphene results in hydrodynamic transport [2] where heat does not diffuse but rather propagates in a wavelike fashion, giving rise to the second sound phenomenon[7].","PeriodicalId":292399,"journal":{"name":"2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114720646","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}

引用次数: 0

Experimental study on helical propulsion system of artificial nanoswimmer: Low reynolds number 人工纳米游泳者螺旋推进系统的实验研究:低雷诺数

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117279

Paul Varghese, S. Nain, J. Rathore, N. N. Sharma

引用次数: 1

A flexible transparent nanopore device for pressure sensing and drug release 一种用于压力传感和药物释放的柔性透明纳米孔装置

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117491

Chao Song, Pan Deng, L. Que

引用次数: 1

Fabrication of nanoscale features on ultra-thin glass-based dielectrics via self-masking and preferential etching to enhance capacitance 利用自掩膜和优先蚀刻技术在超薄玻璃基介电体上制备纳米级特征以增强电容

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117494

Amoghavarsha Mahadevegowda, C. Johnston, P. Grant

引用次数: 0

Synthesis of functional ceramic nanocrystals (SiC, TiC, TiN) by arc-discharge plasma process 电弧放电等离子体法制备功能陶瓷纳米晶(SiC, TiC, TiN)

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117328

Jian Gao, Jieyi Yu, Shanshan Lu, Jingshuang Liang, Wenfei Yang, Zi-ming Wang, Xinglong Dong

引用次数: 0

Effects of the growth parameters on the hydrothermal synthesis of ZnO nano-rods and their application to GaN based LEDs 生长参数对水热合成ZnO纳米棒及其在GaN基led中的应用的影响

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117402

In Yeol Hong, Y. Cha, Tae Kyoung Kim, Seung kyu Oh, J. Kwak

引用次数: 1

The characterization of defects states and charge injection barriers in perovskite solar cells 钙钛矿太阳能电池中缺陷态和电荷注入势垒的表征

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117404

F. Lan, Minlin Jiang, Guangyong Li

引用次数: 2

Role of halide anions in perovskite/graphene oxide photovoltaics 卤化物阴离子在钙钛矿/氧化石墨烯光伏中的作用

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117400

Muge Acik, S. Sankaranarayanan, R. Rosenberg

{"title":"Role of halide anions in perovskite/graphene oxide photovoltaics","authors":"Muge Acik, S. Sankaranarayanan, R. Rosenberg","doi":"10.1109/NANO.2017.8117400","DOIUrl":"https://doi.org/10.1109/NANO.2017.8117400","url":null,"abstract":"Smart device designs with cheap materials and simple processing methods are necessary for cost-effective and efficient solar cell manufacturing. Methylammonium lead halides (MAPbTx, T = I, Br, Cl) perovskites are promising photovoltaic materials, with high power conversion efficiency (PCE>22%). Perovskite instability, however, has been one of the major obstacles for achieving device performance. Another challenge is the uncontrolled chemistry at the interfaces of the electron/hole transporting layers that limit device function. In order to facilitate an efficient charge transport, graphene-derived nanomaterials made from graphene oxide (GO) and reduced graphene oxide (RGO) have replaced metal oxides and polymers. Overcoming the variation in PCE due to the presence of defects at the interfaces of GO and MAPbTx remains a challenge. Therefore, understanding the fundamental nature of defects is necessary to identify the root cause of device performance failure. In order to investigate interfacial defect modification, we utilize an in situ spectroscopy characterization approach to study chemical interactions at GO/MAPbTx interfaces. We find that halide anions of the perovskite precursors determine defect nucleation in GO, and thereby the growth mechanism. These results demonstrate the need for interface characterization to improve the reliability of perovskite photovoltaics.","PeriodicalId":292399,"journal":{"name":"2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126904551","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}

引用次数: 0

Development and characterization of nanoparticles as imaging probes for correlative optical and electron microscopy 相关光学和电子显微镜成像探针纳米粒子的研制与表征

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117452

Prem S. Thapa-Chetri, Carolina M. Santiago-Robles, N. Martinez-Rivera, I. Torres-Vazquez, V. Joshi, R. Powell, E. Rosa-Molinar

引用次数: 0

Multi-bit memories fabricated through mechanical and plasma induced deformation of layered semiconductors 利用层状半导体的机械和等离子体诱导变形制备多比特存储器

2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO) Pub Date : 2017-07-01 DOI: 10.1109/NANO.2017.8117396

Mikai Chen, Xiaogan Liang

引用次数: 0