I obtained my master's degree at Northeastern Petroleum University in China (2018). During my three-year study in the Center of Functional Composite led by Prof. Huaiyuan WangLink opens in a new window, I worked on the fabrication of superhydrophobic and superamphiphobic materials via cost-effective chemical approaches. While my main focus at that time was on the chemical synthesis of material, I gained experiences in the use of scanning electron microscopy (SEM/FESEM), XRD, differential scanning calorimetry (DSC), atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS).
In 2019, I started my PhD study at Swansea University with the support from China Scholarship Council (supervisor: Prof. Christian KlinkeLink opens in a new window). After I moved from Swansea to Warwick, I joined both the Microscopy Group and Terahertz/Ultrafast Spectroscopy Group. My current supervisors are Dr. Jeremy Sloan and Dr. James Lloyd-Hughes.
The project I used to work on was the fabrication of functional composite materials and characterization of their anti-corrosive property. My PhD project at Swansea University was to develop narrow bandgap single-crystalline 2D metal chalcogenide nanomaterials (e.g., rock-salt PbS and SnS). My current research focus in Warwick is to study the atomic structures and transient spectroscopic performances of 1D nanowire-filled single-walled carbon nanotubes (NW-filled SWCNTs). To determine the lattice structure of these uniquely thin 1D nanomaterials, I carried out electron microscopic imaging / electron diffraction measurements based on Warwick's world-class Aberration-Corrected Annular Dark-Field Scanning Transmission Electron Micrpscope (AC-ADF-STEM). I also studied the properties of materials by SEM, peak-force tapping (ScanAsyst) AFM and confocal Raman spectroscopy (using facilities based in Warwick and CNRS (Nantes, France)). To "visualize" the sub-picosecond exciton dynamics and charge carrier properties of the materials, I carried out steady-state and femtosecond pump-probe measurements (e.g., PL, FTIR, time-domain terahertz time-domain spectroscopy (THz-TDS), transient absorption) in the Warwick Centre for Ultrafast Spectroscopy (WCUS) and the terahertz lab.
Structure of material
Nanostructure and dimensionalities of SWCNT-based material can be studied by dark-field STEM, electron diffraction and AFM imaging.
Spectroscopic characterizations on the SWCNT hybrids
The fluorescence of small-diameter semiconducting SWCNTs (e.g., (6,4), (6,5)) presents in the NIR wavelengths (860-1250 nm, or 1.44-1 eV), which is detected by either a liquid N2-cooled InGaAs detector or single photon counting photomultiplier tubes (PMT detector).
The decay dynamics of SWCNT excitons associated with different excitonic states (Eii, i = 1, 2, 3,..) or their phonon sidebands can be investigated through the optical-pump/UV-Vis-NIR-probe (transient absorption) experiments. Different types of transient features, including photo bleaching (negative differential transmission) and photo absorption (positive differential transmission), can be measured by the transient absorption setup, making it a powerful tool for studying the electronic nature of carbon nanotubes. To further characterize the phonon feature of materials, Raman spectroscopy of SWCNTs at different excitation wavelengths under various temperatures can be conducted.
Signatures of free carriers (plasmonic resonance) of SWCNTs exist on the unconventional terahertz frequencies (<1000 cm-1/30 THz). Time-domain (TDS) and time-resolved (OPTP) terahertz spectroscopy can be used to study the dynamics of these carriers and how it evolves with a change in the nanostructure and chemical composition of SWCNTs.
2022 Ziyi Hu*, Ben Breeze, Reza J. Kashtiban, Jeremy Sloan*, and James Lloyd-Hughes*, Zigzag HgTe Nanowires Modify the Electron–Phonon Interaction in Chirality-Refined Single-Walled Carbon Nanotubes. ACS Nano, DOI: https://doi.org/10.1021/acsnano.2c01647
2021 Ziyi Hu, Ryan O'Neill, Rostyslav Lesyuk, Christian Klinke*, Colloidal Two-dimensional Metal Chalcogenides: Realization and Application of the Structural Anisotropy. Accounts of Chemical Research, 54, 20, 3792–3803, DOI: https://doi.org/10.1021/acs.accounts.1c00209
2017 Ziyi Hu, Huaiyuan Wang*, Yixing Zhu, Yanji Zhu, Rapid development of thickness‐controllable superamphiphobic coating on the inner wall of long narrow pipes. AIChE Journal, 63: 3636–3641, DOI: https://doi.org/10.1002/aic.15843Link opens in a new window
2017 Huaiyuan Wang*, Ziyi Hu, Yixing Zhu, Shuhui Yang, Kai Jin, Yanji Zhu, Toward easily enlarged superhydrophobic materials with stain-resistant, oil–water separation and anticorrosion function by a water-based one-step electrodeposition method. Industrial & Engineering Chemistry Research, 56, 4, 933-941, DOI: https://doi.org/10.1021/acs.iecr.6b04401Link opens in a new window
2016 HuaiyuanWang*, Yixing Zhu, Ziyi Hu, Xiguang Zhang, Shiqi Wu, Rui Wang, Yanji Zhu, A novel electrodeposition route for fabrication of the superhydrophobic surface with unique self-cleaning, mechanical abrasion and corrosion resistance properties. Chemical Engineering Journal, 303, 37-47, DOI: https://doi.org/10.1016/j.cej.2016.05.133
2021 Huaiyuan Wang, Ziyi Hu, Yanji, Zhu, Yixing Zhu, Chijia Wang, Method and device for preparing high strength and durable super-hydrophobic film layer on inner wall of elongated metal tube. US Patent, US 11078572 B2
(Upcoming) Aug, 2022, ACS Fall Meeting, Presentation title: Modifying electron-phonon interaction in chirality-refined single-walled carbon nanotubes by zig-zag HgTe nanowire filling
November, 2021, 7th Nano Today Conference, Presentation Title: Synthesis and Spectroscopy of Chirality-Refined HgTe-Filled Single Walled Carbon Nanotubes
I am currently a lab demonstrator in the 1st Year Physics Laboratory.
January 5th-20th, 2019 invited to visit the Institute of Physical Chemistry, University of Hamburg (Germany).