The E2 multifunctional metallographic microscopic transfer system for two-dimensional materials is a mature commercial solution for transferring low-dimensional material heterojunction devices. It has been deployed in the laboratories of numerous distinguished scholars at home and abroad, including academicians, Yangtze River Scholars, Distinguished Young Scholars, and Young Thousand Talents Program researchers. Multiple high-impact papers have been published based on this system in journals such as ACS Nano, Nano Energy and Advanced Materials. It supports precise point-to-point transfer of monolayer materials including graphene, molybdenum disulfide and black phosphorus, as well as the fabrication of multilayer van der Waals heterojunctions, enabling visual operation during the transfer of low-dimensional materials. While retaining the excellent integrated transfer performance of the E1-B model, the E1-N features an upgraded optical system for its metallographic microscope, which drastically enhances the resolution and clarity for observing monolayers, multilayers and various van der Waals heterojunctions.
I. Main Configuration
Control chassis
| Substrate Stage | 5-axis adjustable design: 2-axis translation along X and Y axes with a travel range of 20 mm; Z-axis travel range of 10 mm; horizontal tilt angle adjustment of ±2°; manual rotation of ±90° around the Z-axis. The sample stage supports heating up to a maximum temperature of 240 °C with a temperature control stability of ±0.1 °C, and is equipped with a vacuum sample holding function. |
| Slide moving stage | Five-axis adjustable design, with three-axis manual translation along X, Y and Z directions and a travel range of 25 mm; samples are loaded onto a manual rotary stage with a table diameter of 100 mm. The coarse rotation range is 360°, the fine rotation range is 5°, and the positioning accuracy is 1~2°. The slide tilt angle along the Y-axis is adjustable within a range of 15°. |
| microscope | Domestic metallographic microscope body, trinocular tube, two 10× eyepieces, and three objective lenses of 5×, 20× and 50× |
| High-stability microscopic observation stand | The microscope can independently travel 50 mm along the X and Y axes, allowing wide-range adjustment of the microscope's observation position after two-dimensional material lamination; the focusing travel is 30 mm with a precision of 1 μm |
| Integrated system electrical control, controlling the heating and adsorption of the sample stage, and adjusting the brightness of microscopic illumination |
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| Control Host | Intel Core i5 processor, 8GB RAM, 1TB hard drive, 23.8-inch high-definition monitor |
| Optional functions | Magnetic adsorption probe station and bracket, electric precision displacement module and controller, fiber end-face material transfer module, installation for glove box internal operating environment, matching damped optical vibration isolation platform |
| Microscopic camera | 12 million pixel high-sensitivity CMOS sensor; microscope camera operation software provided |
II. Standard Configuration
Cost-effective domestic metallurgical microscope upgrade solution: 95 mm ultra-long working distance objectives of 5×, 20× and 50×; brightfield epi-illuminator with field stop and aperture diaphragm adjustment functions; 6500 K color temperature white LED illumination; trinocular tube with 10× eyepieces, featuring switching between imaging and observation modes, 20 mm field of view.
Microscopic Imaging Optical Path System: Composed of a coaxial illumination system, 5×, 20× and 50× objective lenses with an extra-long working distance of 95 mm, a 12-megapixel CMOS microscopic camera, and a 23.8-inch full HD professional monitor. The high-sensitivity 12-megapixel CMOS microscopic camera features an exposure time ranging from 0.1 ms to 15 s and automatic white balance. Matching operating software for the microscopic camera is provided, which supports functions including photo capture, video recording, sample dimension measurement and split-screen comparison, and can be controlled via a computer. The microscopic imaging optical path system enables clear visualization of mechanically exfoliated single-layer graphene samples on silicon wafers.
Substrate Loading Stage: Adjustable along XYR three axes; travel range of 20 mm in X and Y directions with a system resolution of 0.002 mm; manual rotation of 90° around the Z-axis and fine adjustment travel of 5 via micrometer with an adjustment accuracy of approximately 0.1;
Tilt stages around the X and Y axes operated by manual handwheels, featuring a 20 mm thick platform and a tilt angle of 2°. They are used to adjust the parallelism of samples on substrates and glass slides during transfer; the Z-axis has a travel range of 10 mm with an accuracy of 2 pm;
The maximum heating temperature of the sample stage is 240°C;
The sample stage is equipped with a vacuum adsorption function for samples to ensure precise fixation of target samples during the transfer process. The flow rate of the vacuum pump is 35 L/min.
Slide Moving Platform: Three-axis XYZ adjustable, 80 mm high-stability stage with 25 mm travel in X and Y directions controlled by micrometer screws; the Z-axis is equipped with a 29 mm diameter micrometer head with 100 divisions to facilitate precise lifting and lowering operations without obvious sample shaking during movement. Samples are loaded onto a manual rotary stage with a 100 mm diameter table, featuring a 360° coarse rotation range and 5° fine rotation range with positioning accuracy of 1° to 2°. The slide tilt angle along the Y-axis is adjustable within a 15° range at an adjustment precision of approximately 0.1°, operated via a manual micrometer head.
Optional Functions
Option 1: Magnetically Attachable Probe Holder and Bracket
Magnetic base with X-Y-Z travel of 12.5 mm each and a movement accuracy of 2 micrometers; coaxial probe fixture, 2 m coaxial cable, and 6 mm high-rigidity stainless steel tube with a breakdown voltage of 500 V for probe grounding or voltage application. Probes feature a 5-micrometer tungsten-coated hard tip diameter, supplied at 10 pieces per box. Custom detachable probe holder bracket and stainless steel support plate with customizable dimensions and heights based on actual application requirements.
Option 2: Motorized Precision Displacement Module and Controller
The motorized Z-axis adopts imported motors and controllers, offering a 25 mm travel range with a minimum positioning accuracy of 0.11 micrometers. Multiple speed levels are available, supporting both continuous and single-step motion. It is suitable for slow heterojunction lamination and automatic lamination inside glove boxes. Precise control of Z-axis movement speed reduces interlayer bubbles generated during heterojunction transfer lamination and enables fine Z-axis adjustment within glove boxes.
The motorized rotation unit uses imported motors and controllers with a 90° rotation range and an accuracy of up to 0.01°, supporting both continuous and single-step rotation. It is especially applicable for fabricating stacked double-layer twisted graphene and other twisted/misaligned two-dimensional heterojunction devices requiring precise stacking angle control.
The METATEST motor control software enables convenient speed configuration and motion control of motorized stages, alongside photo rotation and transparency processing functions, which greatly simplify sample localization and accurate transfer.
Option 3: Fiber End-face Material Transfer Module
Manual two-axis translation of the substrate loading platform along the X and Y axes with a travel range of 13 mm; manual rotation adjustment of 90° around the Z axis with both coarse and fine tuning, achieving a rotation accuracy of 1°; horizontal tilt angle adjustment of 4° to calibrate the parallelism of samples on substrates and glass slides during transfer; the maximum heating temperature of the sample stage is 150°C; the sample stage is equipped with a vacuum sample adsorption function to ensure precise fixation of target sample positions throughout the transfer process. The vacuum pump is controlled by an electromagnetic valve with a flow rate of 35 L/min.
Specially designed fixtures and sample stages support both conventional transfer of two-dimensional materials and material transfer onto fiber end faces. SMA and FC-SC fiber connectors are provided to further meet experimental requirements for transferring two-dimensional materials onto fiber end faces.
Optional Configuration 4: Installation for glove box operating environments
The transfer of certain special materials with strict environmental requirements, such as perovskites, can be equipped with a transfer system for installation and use inside a glove box.
Optional Configuration 5: Matching Damped Optical Vibration Isolation Platform
Actual photos of transfer effect
