Great question! Some thoughts, I would suggest:
First, select the nano transistors - like their larger counterparts, can be used as a variable resistor in a voltage divider circuit. When selecting, consider threshold voltage, current carrying capacity, and power dissipation.
Then, connect the source of the nano transistor to the input voltage. Connect the drain to the ground. The gate voltage controls the resistance between the source and the drain, and thus controls the output voltage.
Thirdly, calculate the required gate voltage - use the transistor's I-V characteristics to calculate the gate voltage required to achieve the desired output voltage.
Finally, test the circuit - after building the circuit, test it with different input voltages and gate voltages to ensure it works as expected.
Just remember, nano transistors are extremely sensitive and can be affected by temperature, electronic noise, and other factors. They also operate in the quantum realm, so quantum effects such as tunneling may come into play. Always consider these factors when designing and testing your circuit.
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Use Multisim and change the parameters of the transistors there (change the transistor model). Another possibility is to use LTSpice that is free and use different transistor models (you can ask on the internet what transistor model you should use for nanotransistors in LTSpice)
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