Russia's Ilya Zakharov and Evgeny Kuznetsov were second, with United States duo Kristian Ipsen and veteran Troy Dumais, in his fourth Olympics, third.
Luo said: 'I attended the 2004 and 2008 Olympic Games selection but I failed. I was so disappointed during that time and I was thinking about retiring.
I was very nervous. In the second half of the competition I had a belly-ache because I was still a little bit nervous. That is because this is the Olympic games.Qin Kai
'I thought this may be my destiny – not winning a gold medal at an Olympic Games. This year I went into the final and winning the first gold medal I feel proud of myself.'
'I was very nervous,' Qin said. 'In the second half of the competition I had a belly-ache because I was still a little bit nervous.
'That is because this is the Olympic Games. This is the top level in the world, but we did good eventually. This is our normal performance.'