Disable button in jQuery

My page creates multiple buttons as id = 'rbutton_"+i+"'. Below is my code:

<button type="button" id = 'rbutton_"+i+"' onclick=disable(i);>Click me</button>

In Javascript

function disable(i){
    $("#rbutton'+i+'").attr("disabled","disabled");
}

But it doesn’t disable my button when I click on it.