Robert Lewandowski's opener for Barca was canceled out by Victor Osimhen as the round 16 first-leg clash finished all square.
Araujo said: "We will head home quite sad because of the final score. I really believe that we could have won this.
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"We played really well, particularly in the first 30 minutes. But Napoli are a top side now they have to come to our place, in front of our fans.
"We'll give everything we've got in Barcelona to get through to the quarter-finals. We showed we are a powerful and competitive side here tonight. Maybe we allowed them a little too much freedom in some phases but it's all to play for."