[R] how to put \ in a string?

[weix1]

I have string as follows:"v:\work\gene" 
however, i can not write this as character string in R
what i did is:
path<- as.character("v:\work\gene")

but it seems that \ is eliminated:
Warning messages:
1: '\w' is an unrecognized escape in a character string 
2: '\g' is an unrecognized escape in a character string 
3: unrecognized escapes removed from "v:\work\gene" 
> path
[1] "v:workgene"

how can i keep the \ in string.

thanks

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