Highly sensitive and flexible pulse detection probe based on three-dimensional graphene and its preparation method
A technology for detecting probes and graphene, applied in the field of biomedical detection instruments, can solve the problems of difficulty in transferring two-dimensional graphene, complex structure, difficult preparation, etc., and achieve the effects of fast detection speed, high test accuracy and simple operation
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[0036] Such as figure 2 , is a method for preparing a highly sensitive flexible pulse detection probe based on three-dimensional graphene, and the specific steps are:
[0037] Three-dimensional graphene was prepared by chemical vapor deposition (CVD) using 0.5 mm thick nickel foam as a template. Before the experiment, the nickel foam was cut into a size of 2cm×21cm and placed in a tube furnace. A mixed gas of hydrogen and argon is used as a carrier, absolute ethanol is used as a carbon source, and the preparation process is controlled under normal pressure. The hydrogen and argon flow rates are controlled at 25 sccm and 50 sccm respectively, and the temperature of the tube furnace is raised to 1000 °C at 50 °C / min and maintained for 10 minutes to pretreat the surface of the nickel foam. Ethanol was then introduced using a bubbler for a 20 minute growth time. After the reaction was completed, the tube furnace was immediately closed down to room temperature. The foamed nick...
Embodiment 1
[0045] Attach the prepared pulse probe to the chest or wrist, and use Figure 4 The circuit test, the circuit is powered by a voltage source U S , fixed resistance R, pulse probe resistance R g , oscilloscope, where R>>R g , pulse probe resistance R g The voltage U across the terminal is:
[0046]
[0047] Among them, U S is the voltage of the voltage source, the measured voltage signal U reflects the heartbeat or pulse signal, Figure 5 is the measured pulse signal.
Embodiment 2
[0049] Attach the two pulse probes to the arteries at the crook of the forearm and the bowl of the hand respectively, and use Figure 4 The test circuit, and the use of synchronous trigger technology, measured the pulse signal of the two places such as Figure 6 shown, according to Figure 6 It can be seen that the time delay, combined with the distance from the bend of the forearm to the bowl of the hand, calculates the velocity of blood flow to be 18cm / s.
[0050] The above is only a partial implementation of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements can also be made, and these improvements should be regarded as the present invention. scope of protection.
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