Tianling Ren

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Heart rate measurement is a basic and important issue for either medical diagnosis or daily health monitoring. In this work great efforts have been focused on realizing a portable, comfortable and low cost solution for long-term domestic heart rate monitoring. A tiny but efficient measurement system composed of a polymer-based flexible pressure sensor and(More)
A ~1 MHz piezoelectric micromachined ultrasonic transducer (pMUT) array with ultra-high element density and low crosstalk is proposed for the first time. This novel pMUT array is based on a nano-layer spin-coating lead zirconium titanium film technique and can be fabricated with high element density using a relatively simple process. Accordingly, key(More)
A carbonized plain-weave silk fabric is fabricated into wearable and robust strain sensors, which can be stretched up to 500% and show high sensitivity in a wide strain range. This sensor can be assembled into wearable devices for detection of both large and subtle human activities, showing great potential for monitoring human motions and personal health.
Highly ordered TiO(2) nanoribbons with a width from 150 nm to several micrometres and a thickness of 60 nm were fabricated by a path-directed and maskless route. Structural analysis and mechanical properties indicate that the nanoribbons are suited for constructing array-nanodevices. The method exhibits many advantages such as designability, precise size(More)
Tsinghua National Laboratory for Inform Institute of Microelectronics, Tsinghua Un E-mail: xiedan@tsinghua.edu.cn; rentl@tsi Key Laboratory for Advanced Manufactur Ministry of Education and Department University, Beijing 100084, P. R. China. E-m +86 10 62773637; Tel: +86 10 62781065 Center for Nano and Micro Mechanics (CNM P. R. China † Electronic(More)
A single-layer graphene film was grown on copper foil by chemical vapor deposition and transferred onto a silicon-pillar-array (SPA) substrate to make a Schottky junction solar cell. The SPA substrate was specifically designed to suppress reflectance and enhance light absorption. The energy conversion efficiency of the prepared graphene/SPA solar cells(More)
We present a first-principles density functional theory study focused on how the chemical and electronic properties of polyaniline are adjusted by introducing suitable substituents on a polymer backbone. Analyses of the obtained energy barriers, reaction energies and minimum energy paths indicate that the chemical reactivity of the polyaniline derivatives(More)