Possible Duplicate:
Simplest way to typeset entire document in sans serif (Helvetica)
I use document class article and included
\usepackage{helvet}
I now begin my document with
\begin{document}
\sf % select sans-serif family
% ... text here ...
Most text is indeed sans-serif. But fur example the footnotes and {\bf bold text} is not.
Let me summarize a test document:
\documentclass[12pt,english]{article}
\usepackage{helvet}
\begin{document}
\sf % select sans-serif family
\title{Document title is sans-serif, fine}
\maketitle
Normal Text is sans-serif, too. % sans-serif, ok.
{\bf This bold text should be sans-serif, too.} % bold, but roman!!!
\end{document}
\sf,\bf, etc. Use\textsf,\textbf, etc. instead. – raphink Sep 26 '12 at 13:38