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Construction of mesoporous silica-implanted tungsten oxides for selective acetone gas sensing

Chinese Chemical Letters 2024年第11期35卷 492-498页

作者： Jichun Li Zhengren Wang Yu Deng Hongxiu Yu Yonghui Deng Xiaowei Cheng Kaiping Yuan Department of Chemistry Shanghai Stomatological Hospital&School of StomatologyState Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiCHEMFudan UniversityShanghai 200433China Frontier Institute of Chip and System State Key Laboratory of ASIC and SystemFudan UniversityShanghai 200433China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050China

As a key biomarker for noninvasive diagnosis of diabetes,the selective detection of trace acetone in exhaled gas using a portable and low-cost device remains a great *** metal oxide(SMO)based gas sensors have drawn signification attention due to their potential in miniaturization,user-friendliness,high cost-effectiveness and selective real-time detection for noninvasive clinical ***,we propose a one-pot solvent evaporation induced tricomponent co-assembly strategy to design a novel ordered mesoporous SMO of silica-implanted WO_(3)(Si O_(2)/WO_(3))as sensing materials for trace acetone *** controlled co-assembly of silicon and tungsten precursors and amphiphilic diblock copolymer poly(ethylene oxide)-block-polystyrene(PEO-b-PS),and the subsequent thermal treatment enable the local lattice disorder of WO_(3)induced by the amorphous silica and the formation of ordered mesoporous Si O_(2)/WO_(3)hybrid walls with a unique metastableε-phase WO_(3)*** obtained mesoporous SiO_(2)/WO_(3)composites possess highly crystalline framework with large uniform pore size(12.0-13.3 nm),high surface area(99-113 m^(2)/g)and pore volume(0.17-0.23 cm^(3)/g).Typically,the asfabricated gas sensor based on mesoporous 2.5%Si O_(2)/WO_(3)exhibits rapid response/recovery rate(5/17 s),superior sensitivity(R_(air)/R_(gas)=105 for 50 ppm acetone),as well as high selectivity towards *** limit of detection is as low as 0.25 ppm,which is considerably lower than the thresh value of acetone concentration(>1.1 ppm)in the exhaled breath of diabetic patients,demonstrating its great prospect in real-time monitoring in diabetes ***,the mesoporous 2.5%Si O_(2)/WO_(3)sensor is integrated into a wireless sensing module connected to a smart phone,providing a convenient real-time detection of acetone.

关键词： Mesoporous materials ε-Tungsten oxide Silica-implanted Acetone sensing Real-time detection

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Provably good and practically efficient algorithms for CMP dummy fill 09

Provably good and practically efficient algorithms for CMP d...

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2009 46th ACM/IEEE Design Automation Conference, DAC 2009

作者： Chunyang, Feng Hai, Zhou Changhao, Yan Jun, Tao Xuan, Zeng State Key Lab. of ASIC and System Microelectronics Dept. Fudan University China EECS Northwestern University United States

ISBN: (纸本)9781605584973

To reduce chip-scale topography variation in Chemical Mechanical Polishing (CMP) process, dummy fill is widely used to improve the layout density uniformity. Previous researches formulated the dummy fill problem as a standard Linear Program (LP). However, solving the huge linear program formed by real-life designs is very expensive and has become the hurdle in deploying the technology. Even though there exist efficient heuristics, their performance cannot be guaranteed. In this paper, we develop a dummy fill algorithm that is both efficient and with provably good performance. It is based on a fully polynomial time approximation scheme by Fleischer [4] for covering LP problems. Furthermore, based on the approximation algorithm, we also propose a new greedy iterative algorithm to achieve high quality solutions more efficiently than previous Monte-Carlo based heuristic methods. Experimental results demonstrate the effectiveness and efficiency of our algorithms. Copyright 2009 ACM.

关键词： Machine design

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A high speed reconfigurable face detection architecture

A high speed reconfigurable face detection architecture

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2011 IEEE 9th International Conference on asic, asicON 2011

作者： Zhou, Weina Zou, Yao Dai, Lin Zeng, Xiaoyang State Key Lab. of ASIC and System Fudan University Shanghai 201203 China Shanghai Maritime University Shanghai 200135 China

ISBN: (纸本)9781612841908

Face detection has been playing an important role in more and more fields, which makes it necessary and urgent to have its architecture reconfigurable to satisfy different requirements on detection capabilities. The paper proposes a face detection architecture, which could be adjusted by the users according to the environment, the sensor resolution, the different requirements of detection accuracy and speed. This user adjustable mode makes the reconfiguration simple and efficient, and especially benefits for the application of portable mobile terminals whose working condition often changes frequently. Experimental results show that the reconfiguration of the architecture is very reasonable in face detection and synthesized report also indicates its advantage on speed and accuracy. © 2011 IEEE.

关键词： Face recognition

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Design of a UHF RFID tag baseband with the hummingbird cryptographic engine

Design of a UHF RFID tag baseband with the hummingbird crypt...

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2011 IEEE 9th International Conference on asic, asicON 2011

作者： Xiao, Mengqin Shen, Xiang Wang, Junyu Crop, Joseph State Key Lab. of ASIC and System Fudan University Shanghai 200433 China Department of EECS Oregon State University Corvallis OR 97330 United States

ISBN: (纸本)9781612841908

Radio frequency identification (RFID) is a technology for automatic object identification. It has wide applications in many areas such as manufacturing, transportation, healthcare, and so on. However, many RFID systems are suffering from security issues. In this paper, we present an implementation of a secure UHF RFID tag baseband with a Hummingbird (HB) cryptographic engine using the SMIC 0.13μm technology. An improvement of the Gen2 protocol based on our secure engine is proposed to enhance security. The implementation results show that the area of our baseband is 16,986 gate equivalents and the secure engine takes 23.6% of the entire die area. The overall power consumption of our baseband is 30.67μW at a clock frequency of 1.28MHz and with 1.2V power supply, which is suitable for resource-constrained RFID tags. © 2011 IEEE.

关键词： Cryptography

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An energy-efficient reconfigurable asymmetric modular cryptographic operation unit for RSA and ECC

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Frontiers of Information Technology & Electronic Engineering 2022年第1期23卷 134-144页

作者： Mengni BIE Wei LI Tao CHEN Longmei NAN Danyang YANG Information Engineering University Zhengzhou450001China State Key Lab of ASIC and System Fudan UniversityShanghai200000China

RSA and ellipse curve cryptography(ECC)algorithms are widely used in authentication,data security,and access *** this paper,we analyze the basic operation of the ECC and RSA algorithms and optimize their modular multiplication and modular inversion *** then propose a reconfigurable modular operation architecture,with a mix-memory unit and double multiply-accumulate structures,to realize our unified,asymmetric cryptosystem structure in an operational *** with 55-nm CMOS process,our design runs at 588 MHz and requires only 437801µm2 of hardware *** proposed design takes 21.92 and 23.36 mW for 2048-bit RSA modular multiplication and modular inversion respectively,as well as 16.16 and 15.88 mW to complete 512-bit ECC dual-field modular multiplication and modular inversion *** is more energy-efficient and flexible than existing single algorithm *** with existing multiple algorithm units,our proposed method shows better *** operation unit is embedded in a 64-bit RISC-V processor,realizing key generation,encryption and decryption,and digital signature functions of both RSA and *** proposed design takes 0.224 and 0.153 ms for 256-bit ECC point multiplication in G(p)and G(2^(m))respectively,as well as 0.96 ms to complete 1024-bit RSA exponentiation,meeting the demand for high energy efficiency.

关键词： Modular operation unit Reconfigurable High energy efficiency

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Electrical properties study of Ni (Pt)-silicide/Si contacts

Electrical properties study of Ni (Pt)-silicide/Si contacts

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ICSICT-2006: 2006 8th International Conference on Solid-state and Integrated Circuit Technology

作者： Huang, Yifei Jiang, Yu-Long Ru, Guo-Ping Lu, Fang Cai, Qijia Cao, Shihai Li, Bing-Zong ASIC and System State Key Lab. School of Microelectronics Fudan University Shanghai 200433 China State Key Lab. of Applied Surface Physics Fudan University Shanghai 200433 China

The electrical propertie of Ni (Pt)-silicide/Si contact is studied and it is revealed that the Schottky barrier contact obeys a complicated two Gauss distribution. It is demonstrated that the Pt interface layer can no... 详细信息

ISBN: (纸本)1424401615

关键词： Silicides

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A novel approach based on recursive indexing for FFT data reordering

A novel approach based on recursive indexing for FFT data re...

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IET International Conference on Information and Communications Technologies, IETICT 2013

作者： Huang, Jiasen Chen, Shuai Chen, Chixiao Ye, Fan Ren, Junyan State-Key Lab of ASIC and System Fudan University Shanghai China Micro-/Nano-Electronics Innovation Platform Fudan University Shanghai China

ISBN: (纸本)9781849196536

Considering the problem that the well-known bit-reversal algorithm is only fit for radix-2 Fast Fourier Transform (FFT) data reordering, a novel approach based on recursive indexing is proposed for radix-r FFT data reordering. The proposed scheme discards a look-up table required by bit-reversal algorithm. The corresponding hardware structure only costs a RAM whose depth is equal to the size of FFT, and saves a same order of extra additions involved in a quite recent scheme based on vector calculation.

关键词： Fast Fourier transforms

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A 1-V switched-opamp sample-and-hold circuit for wideband wireless communication

A 1-V switched-opamp sample-and-hold circuit for wideband wi...

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2008 4th IEEE International Conference on Circuits and systems for Communications, ICCSC

作者： Qin, Yajie Hong, Zhiliang Signell, Svante COS KTH-the Royal Institute of Technology Stockholm Sweden State Key Lab. of ASIC and System Fudan University Shanghai China IEEE

ISBN: (纸本)9781424417087

This paper presents a 1-V 10bit 50MSPS Switched-Opamp (SO) S/H circuit, designed in 3.3V/1.8V 0.18m 1P6M CMOS technology, which could be used in wideband wireless transceivers. A new architecture of the low voltage switchable opamp with improved common-mode feed back (CMFB) loop is introduced for its fast wake-up speed. Simulation results show the S/H circuit achieves a THD of -75dB and a SFDR of 76dB at the Nyquist frequency (Fin = F s/2). The opamp only dissipates a static power of 1.9mW even in active phase. ©2008 IEEE.

关键词： Operational amplifiers

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A low power SHA-less pipelined ADC used in DVB-S2

A low power SHA-less pipelined ADC used in DVB-S2

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2008 9th International Conference on Solid-state and Integrated-Circuit Technology, ICSICT 2008

作者： Zhang Zeng, Xiaoyang Li, Jian Xie, Lei Guo, Yawei State Key Lab. of ASIC and System Fudan University Shanghai 201203 China Comlent Technology Inc. Shanghai 201203 China

ISBN: (纸本)9781424421855

A 8-b 125MS/s pipelined Analog-to-Digital Converter (ADC) used in DVB-S2 is presented in this paper. Based on reviewing low-power design techniques of high speed ADCs, several technologies are used in the design including the SHA-less architecture to reduce the power dissipation significantly. Detailed analysis is given about the relationship between the closed loop bandwidth (BW close) and the current of operational amplifier (OPAMP) used in Multiply Digital-to-Analog Converter (MDAC) to get the lowest power dissipation which can satisfy the ADC. The ADC is realized in SMIC 0.18um 1P6M CMOS process and according to the simulation results, the SNDR is 48dB with the power of 23.5mW. © 2008 IEEE.

关键词： Operational amplifiers

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Electrical Impedance and Radiation Modes Determination for LiNbO3 MEMS Ultrasonic Array Transducer using KLM and FEM Modelling 13

Electrical Impedance and Radiation Modes Determination for L...

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2016 13th IEEE International Conference on Solid-state and Integrated Circuit Technology (ICSICT)

作者： Wei-Zhen Wang Wei-Jiang Xu Jia Zhou Wen-Juan Liu Zheng Xu Jun-Yan Ren State Key Lab of ASIC and System School of Microelectronics Fudan University IEMN-DOAE UMR CNRS 8520 Université de Valenciennes Institute of Acoustics Tongji University

ISBN: (纸本)9781467397209

In MEMS realization of high frequency ultrasonic array transducer, electrical impedance matching may become difficult for the reason of the miniaturization of the piezo-array elements. In this study, the electrical impedance of the array elements is estimated first by using KLM model, and then calculated by using finite elements method(FEM), in the case of a Li Nb O3 based30 MHz array transducer. The impedance frequency behavior is related both to the eigen-resonance modes and the electrode driven modes with the free mechanical boundary condition of the element and to the coupling of these modes to the array structure when the element being integrated as the transducer. The array transducer properties and performances such as lateral modes,crosstalk, sensibility and bandwidth, field radiation,focusing/steering are also simulated and analyzed.

关键词： Electrical Impedance and Radiation Modes Determination for LiNbO3 MEMS Ultrasonic Array Transducer using KLM and FEM Modelling FEM

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