The hybrid graphene-quantum dot devices can potentially be used to tailor the electronic, optical, and chemical properties of graphene. Here, the low temperature electronic transport properties of bilayer graphene dec...The hybrid graphene-quantum dot devices can potentially be used to tailor the electronic, optical, and chemical properties of graphene. Here, the low temperature electronic transport properties of bilayer graphene decorated with PbS colloid quantum dots(CQDs) have been investigated in the weak or strong magnetic fields. The presence of the CQDs introduces additional scattering potentials that alter the magnetotransport properties of the graphene layers, leading to the observation of a new set of magnetoconductance oscillations near zero magnetic field as well as the high-field quantum Hall regime.The results bring about a new strategy for exploring the quantum interference effects in two-dimensional materials which are sensitive to the surrounding electrostatic environment, and open up a new gateway for exploring the graphene sensing with quantum interference effects.展开更多
This paper describes a new method to create nanoscale SiO2 pits or channels using single-walled carbon nanotubes （SWNTs） in an HF solution at room temperature within a few seconds. Using aligned SWNT arrays, a patte...This paper describes a new method to create nanoscale SiO2 pits or channels using single-walled carbon nanotubes （SWNTs） in an HF solution at room temperature within a few seconds. Using aligned SWNT arrays, a pattern of nanoscale SiO2 channels can be prepared. The nanoscale SiO2 patterns can also be created on the surface of three- dimensional （3D） SiO2 substrate and even the nanoscale trenches can be constructed with arbitrary shapes. A possible mechanism for this enhanced etching of SiO2 has been qualitatively analysed using defects in SWNTs, combined with H3O＋ electric double layers around SWNTs in an HF solution.展开更多
The fabrication of nanodevices on the delicate membrane window of the TEM(transmission electron microscopy)chip has the risk of breakage failure,limiting in-depth research in this area.This work proposed a methodology...The fabrication of nanodevices on the delicate membrane window of the TEM(transmission electron microscopy)chip has the risk of breakage failure,limiting in-depth research in this area.This work proposed a methodology to address this issue,enabling secure in-situ transmission electron microscopic observation of many devices and materials that would otherwise be difficult to achieve.Combining semi-custom TEM chip design and front-side protected release technology,a variety of nanodevices were successfully fabricated onto the window membrane of the TEM chip and studied in situ.Moreover,the pressure tolerance of window membrane was investigated and enhanced with a reinforcing structure.As an example of typical applications,MoS;devices on the TEM chip have been fabricated and electron beam-induced gate modulation and irradiation damage effects,have been demonstrated.展开更多
Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements ...Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements showed that the obtained W_（18）O_（49） nanowires have excellent FE property.The turn-on field was 7.1 V/μm for 10μA/cm^2 and the observed highest current density was 4.05 mA/cm^2 at a field of 17.2 V/μm.Good electron emission reproducibility was also observed during thermal evaporation and desorption testing.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0300601 and 2017YFA0303304)the National Natural Science Foundation of China(Grant Nos.11774005,11874071,91221202,and 91421303)
文摘The hybrid graphene-quantum dot devices can potentially be used to tailor the electronic, optical, and chemical properties of graphene. Here, the low temperature electronic transport properties of bilayer graphene decorated with PbS colloid quantum dots(CQDs) have been investigated in the weak or strong magnetic fields. The presence of the CQDs introduces additional scattering potentials that alter the magnetotransport properties of the graphene layers, leading to the observation of a new set of magnetoconductance oscillations near zero magnetic field as well as the high-field quantum Hall regime.The results bring about a new strategy for exploring the quantum interference effects in two-dimensional materials which are sensitive to the surrounding electrostatic environment, and open up a new gateway for exploring the graphene sensing with quantum interference effects.
基金supported by the National Natural Science Foundation of China (Grant Nos. 90406007, 61076069, 60776053, and 10434010)the National Basic Research Program of China (Grant No. 2007CB936800)
文摘This paper describes a new method to create nanoscale SiO2 pits or channels using single-walled carbon nanotubes （SWNTs） in an HF solution at room temperature within a few seconds. Using aligned SWNT arrays, a pattern of nanoscale SiO2 channels can be prepared. The nanoscale SiO2 patterns can also be created on the surface of three- dimensional （3D） SiO2 substrate and even the nanoscale trenches can be constructed with arbitrary shapes. A possible mechanism for this enhanced etching of SiO2 has been qualitatively analysed using defects in SWNTs, combined with H3O＋ electric double layers around SWNTs in an HF solution.
基金supported by the National Key Research and Development Program of China (Grant No. 2016YFA0200802)the National Natural Science Fundation of China (Grant No. 11890672)
文摘The fabrication of nanodevices on the delicate membrane window of the TEM(transmission electron microscopy)chip has the risk of breakage failure,limiting in-depth research in this area.This work proposed a methodology to address this issue,enabling secure in-situ transmission electron microscopic observation of many devices and materials that would otherwise be difficult to achieve.Combining semi-custom TEM chip design and front-side protected release technology,a variety of nanodevices were successfully fabricated onto the window membrane of the TEM chip and studied in situ.Moreover,the pressure tolerance of window membrane was investigated and enhanced with a reinforcing structure.As an example of typical applications,MoS;devices on the TEM chip have been fabricated and electron beam-induced gate modulation and irradiation damage effects,have been demonstrated.
基金supported by National Natural Science Foundation of China(Nos.61106073,60971003,60925003)the Key Laboratory of Photochemical Conversion and Optoelectronic Materials,TIPC,CAS(No.PCOM201021)
文摘Non-fully oxidized tungsten oxide（WO_（3-x）） nanostructures with controllable morphology were fabricated by adjusting the gas pressure in chemical vapor deposition.The comparative field emission（FE） measurements showed that the obtained W_（18）O_（49） nanowires have excellent FE property.The turn-on field was 7.1 V/μm for 10μA/cm^2 and the observed highest current density was 4.05 mA/cm^2 at a field of 17.2 V/μm.Good electron emission reproducibility was also observed during thermal evaporation and desorption testing.
