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A general stabilizing strategy based on vitamin C for n-type organic semiconductors

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Science China Materials 2025年第01期 303-304页

作者： Hui Huang college of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Organic semiconductors (OSCs), as an emerging next-generation semiconductor material, hold promising prospects in fields such as flexible displays, electronic skins, smart healthcare,and the Internet of Things, due to their excellent flexibility,solution processability, and tunable band structures [1,2]. These molecules are often classified into n-type and p-type, depending on whether the prevalent charge carriers are electrons or holes[3].

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He Li Li Sai Wang Shao-Jiang Wang Center for Theoretical physics and college of physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

Probing structural and electronic properties of divalent metal Mg_(n+1) and SrMgn (n=2–12) clusters and their anions

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Chinese physics B 2022年第1期31卷 465-471页

作者： Song-Guo Xi Qing-Yang Li Yan-Fei Hu Yu-Quan Yuan Ya-Ru Zhao Jun-Jie Yuan Meng-Chun Li Yu-Jie Yang School of physics and Electronic Engineering Sichuan University of Science&EngineeringZigong 643000China Department of Applied physics Chengdu University of TechnologyChengdu 610059China college of physics&optoelectronics Technology Baoji University of Arts and SciencesBaoji 721016China

Divalent metal clusters have received great attention due to the interesting size-induced nonmetal-to-metal transition and fascinating properties dependent on cluster size,shape,and *** this work,the combination of the CALYPSO code and density functional theory(DFT)optimization is employed to explore the structural properties of neutral and anionic Mg_(n+1) and SrMgn(n=2-12)*** results exhibit that as the atomic number of Mg increases,Sr atoms are more likely to replace Mg atoms located in the skeleton convex *** analyzing the binding energy,second-order energy difference and the charge transfer,it can be found the SrMg9 cluster with tower framework presents outstanding stability in a studied size ***,bonding characteristic analysis reveals that the stability of SrMg9 can be improved due to the strong s-p interaction among the atomic orbitals of Sr and Mg atoms.

关键词： SrMgn(n=2-12)clusters CALYPSO code density functional theory(DFT)optimization

Structures and magnetic properties of Fe and Ni monoatomic chains encapsulated by an Au nanotube

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Chinese physics B 2012年第11期21卷 495-499页

作者：韩志东李秀燕杨致刘瑞萍刘绍鼎张莹 college of physics and optoelectronics Taiyuan University of Technology

Structures and magnetic properties of transition metal （TM） Fe or Ni monoatomic chains （MACs） encapsulated by a Au （5, 5） nanotube （Fe@Au and Ni@Au） are investigated using the density functional theory （DFT）. The calculated results show that both Fe@Au and Ni@Au prefer to adopt ferromagnetic （FM） orders as ground states. In particular, the Fe@Au keeps the magnetic properties of free-standing Fe MAC, indicating that this system may be viewed as a new candidate in electromagnetic devices.

关键词： transition metal monoatomic chains Au nanotube structure magnetic property

Photo-induced absorption in the pump probe spectroscopy of single-walled carbon nanotubes

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Chinese physics B 2013年第7期22卷 542-546页

作者：朱子鹏 college of physics and optoelectronics Taiyuan University of Technology

Femtosecond pump probe spectroscopy is employed to study the photo-induced absorption feature in the single-walled carbon nanotube transient spectrum. The two advantages of the experiment, a chirality enriched sample and tuning the pump wavelength to the resonance of a specific nanotube species, greatly facilitate the identification of the photo-induced absorption signal of one tube species. It is found that a photo-induced absorption feature is located at one radial breathing mode to the blue side of the E11 state. This finding prompts a new explanation for the origin of the photo-induced absorption： the transition from the ground state to a phonon coupled state near the E ii state. The explanation suggests a superposition mechanism of the photo-bleach and photo-induced absorption signals, which may serve as a key to the interpretation of the complex pump probe transient spectrum of carbon nanotubes. The finding sheds some light on the understanding of the complex non-radiative relaxation process and the electronic structure of single-walled carbon nanotubes.

关键词： photo-induced absorption ultrafast spectroscopy carbon nanotubes

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

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Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng Hu Long Yang Zitong Kan Biao Dong Miae Won Hongwei Song Lin Xu Jong Seung Kim State Key Laboratory of Integrated optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning

Exact Solution for Non-Markovian Master Equation Using Hyper-operator Approach

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Communications in Theoretical physics 2019年第9期71卷 1089-1092页

作者： Hong-Chen Fu Zhi-Rui Gong college of physics and optoelectronics Shenzhen University

Non-Markovian master equation of Harmonic oscillator and two-level systems are investigated using the hyper-operator approach. Exact solution of time evolution operator of Harmonic oscillator is obtained exactly. For two-level system the time evolution operator is exactly found and coefficients satisfy ordinary differential equation.

关键词： Non-Markovian approximation master equation hyper-operators

Structural, electronic, and optical absorption properties of TiO_2 nanotube adsorbed with Cu_n clusters

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Science China(physics,Mechanics & Astronomy) 2014年第8期57卷 1519-1525页

作者： GAO YanLin LI XiuYan SHI XiaoFeng YANG Zhi XU LiChun LIU RuiPing college of physics and optoelectronics Taiyuan University of Technology

The structural, electronic, and optical absorption properties of TiO2 nanotube （TiO2NT） with Cun clusters （n =1-4） adsorbed on its surface have been investigated based on density functional theory calculations. The TiO2NT is constructed by rolling up a （101） sheet of anatase TiO2 around the [ 1-01 ] direction; the ground states of Cun/TiOzNT systems are determined by analyzing the average adsorption energies. Calculation results show that odd-even oscillations occur for the average adsorption energy, the Cu-O bond length, and the amount of transferred electrons, with the increase in Cu. cluster size; and the Cun/TiO2NTs with odd n＇s demonstrate stronger interaction between the Cu. cluster and the TiO2NT. Also, the impurity states introduced by the Cun cluster to the band gap of TiOzNT cause an obvious redshift of the optical absorption spectrum toward the visible light region, especially for the even n cases.

关键词： TiO2 nanotube Cun cluster electronic structure optical absorption property

Flexible plasmonic random laser for wearable humidity sensing

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Science China(Information Sciences) 2021年第12期64卷 239-245页

作者： Junhua TONG Xiaoyu SHI Yu WANG Liang HAN Tianrui ZHAI college of physics and optoelectronics Faculty of ScienceBeijing University of Technology

Humidity sensing plays an important role in the professional field and our daily life, such as chemical preparation process, environmental monitoring, and food storage. Herein, a wearable humidity sensor is designed based on a flexible plasmonic random laser. The random laser-based humidity sensor is fabricated by transferring an ultrathin light-emitting polymer membrane doped with silver nanoparticles onto the humidity-sensitive PEDOT:PSS film. Under optical pumping, random lasing with low-threshold is achieved, assisted by the strong plasmonic feedback of the silver nanoparticles. The random laser-based humidity sensor exhibits a good linear response with a coefficient of 0.997. Comparing with the emission intensity at initial relative humidity(RH)(34.8%), the peak intensity increases 5.5 times at an RH value of 93.5%. This phenomenon mainly results from the ambient humidity-sensitive relative refractive index difference between polymer membrane and PEDOT:PSS film. The random laser-based humidity sensor is flexible and nontoxic, which can be transplanted easily to achieve wearable laser devices.

关键词： random lasers humidity sensor wearable plasmonic