You could also use a little bit of thermal compount as used for thermal contact between a CPU and the heatsink in computers, if you happen to have that lying around. The simplest white goop would be good enough.
Alternatively you could use a drop of vegetable oil, it is not as good in transfering heat but this too will close the airgap.
Then use a little tape to clamp the sensor to the tubing so the sensor doesn't move. Covering it with a piece of tubing insulation foam is a good idea.
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