Single supply op amp
A single supply op amp can output all the way to the negative rail and might also be able to output all the way to the positive rail (rail to rail output). review the datasheet for the particular part you are interested in, and test that it meets your demands.
IC output voltage range illustrated for dual split supply single and rail to rail diagram by electronzap electronzapdotcom
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I have used the LM358, which is an 8 pin dual inline package IC with 2 single supply op amps in it.
LM358 dual single supply op amp
019 Op amp non inverting comparator – LM358 operational amplifier
020 op amp inverting comparator – LM358 operational amplifier
021 Op amp Schmitt trigger hysteresis adjustment – LM358 operational amplifier
022 Op Amp Voltage Follower – LM358 single supply
023 LM358 op amp NPN BJT improved hi low comparator indicator LED output circuit
026 op amp current source – LM358
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