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Yu, Hojeong,Bao, Zhenan,Oh, Joon Hak WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.5
<P>On page 629, Hojeong Yu, Zhenan Bao, and Joon Hak Oh report single‐crystalline nanowire organic phototransistors (NW‐OPTs) fabricated using an n‐channel organic semiconductor, <I>N</I>,<I>N</I>′‐bis(2‐phenylethyl)‐perylene‐3,4:9,10‐tetracarboxylic diimide. Highly sensitive and reproducible photoresponses are observed from the NW‐OPTs and photogenerated charge carrier behavior is quantitatively investigated. The findings highlight single‐crystalline NW‐OPTs as an alternative to conventional thin‐film‐type photodiodes and could pave the way for optoelectronic device miniaturization. </P>
Baodong Liu,Zhenan Zhang,Minqiang Zhang,Xiaoxi Wang 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
This paper presents a comparative study on the composite structure of Corrugated Steel Plate (CSP) with normal and rubberized concrete. One CSP-normal-concrete plate and two CSP arch structures composited with diff erent concretes are established. A theoretical section-property deduction is derived, which demonstrated that the fl exural rigidity of such composite structure increased notably. Static and dynamic mechanical experiments are also conducted. Experimental results agree with expectations, and the measured results on plate structures verifi ed the eff ectiveness of the analytical and numerical solutions. Comparing the defl ection of two composite arches shows that the rubberized concrete composite arch has smaller fl exural and compressive stiff nesses, resulting in larger defl ection. The rubberized concrete composite arch has higher steel stress, lower concrete stress and better energy-dissipating capacity compared with the normal concrete composite arch. Therefore, the CSP-rubberized concrete composite structure is more suitable for anti-shock and earthquake-resistant structures.
Nanomaterials in Skin-Inspired Electronics: Toward Soft and Robust Skin-like Electronic Nanosystems
Son, Donghee,Bao, Zhenan American Chemical Society 2018 ACS NANO Vol.12 No.12
<P>Skin-inspired wearable electronic/biomedical systems based on functional nanomaterials with exceptional electrical and mechanical properties have revolutionized wearable applications, such as portable Internet of Things, personalized healthcare monitors, human-machine interfaces, and even always-connected precise medicine systems. Despite these advancements, including the ability to predict and to control nanolevel phenomena of functional nanomaterials precisely and strategies for integrating nanomaterials onto desired substrates without performance losses, skin-inspired electronic nanosystems are not yet feasible beyond proof-of-concept devices. In this Perspective, we provide an outlook on skin-like electronics through the review of several recent reports on various materials strategies and integration methodologies of stretchable conducting and semiconducting nanomaterials, which are used as electrodes and active layers in stretchable sensors, transistors, multiplexed arrays, and integrated circuits. To overcome the challenge of realizing robust electronic nanosystems, we discuss using nanomaterials in dynamically cross-linked polymer matrices, focusing on the latest innovations in stretchable self-healing electronics, which could change the paradigm of wearable electronics.</P> [FIG OMISSION]</BR>
Yu, Hojeong,Bao, Zhenan,Oh, Joon Hak WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.5
<P><B>Abstract</B></P><P>The photoelectronic characteristics of single‐crystalline nanowire organic phototransistors (NW‐OPTs) are studied using a high‐performance n‐channel organic semiconductor, <I>N</I>,<I>N′</I>‐bis(2‐phenylethyl)‐perylene‐3,4:9,10‐tetracarboxylic diimide (BPE‐PTCDI), as the photoactive layer. The optoelectronic performances of the NW‐OPTs are analyzed by way of their current–voltage (<I>I</I>–<I>V</I>) characteristics on irradiation at different wavelengths, and comparison with corresponding thin‐film organic phototransistors (OPTs). Significant enhancement in the charge‐carrier mobility of NW‐OPTs is observed upon light irradiation as compared with when performed in the dark. A mobility enhancement is observed when the incident optical power density increases and the wavelength of the light source matches the light‐absorption range of the photoactive material. The photoswitching ratio is strongly dependent upon the incident optical power density, whereas the photoresponsivity is more dependent on matching the light‐source wavelength with the maximum absorption range of the photoactive material. BPE‐PTCDI NW‐OPTs exhibit much higher external quantum efficiency (EQE) values (≈7900 times larger) than thin‐film OPTs, with a maximum EQE of 263 000%. This is attributed to the intrinsically defect‐free single‐crystalline nature of the BPE‐PTCDI NWs. In addition, an approach is devised to analyze the charge‐transport behaviors using charge accumulation/release rates from deep traps under on/off switching of external light sources.</P>