線是長的細(xì)的，棒是短的粗的，當(dāng)然是相對的！

納米絲、納米線、納米棒是實(shí)心的準(zhǔn)一維納米材料，長度比直徑通常要大得多,可以是宏觀量級。納米絲、納米線、納米棒三者之間的區(qū)分并不嚴(yán)格，通常將長徑比(長度與直徑的比值)較大的稱為納米絲，長徑比較小的稱為納米棒。

The prefix "nano" implies that the diameter of the 1D structure is
in the nanometer regime, rather than larger than a micrometer. The term "fiber" implies nothing specific
about the structure of the fiber - it may be a single crystal, crystallographically amorphous (like
conventional glass is), polycrystalline, etc. The term "whisker" is generally accepted to mean that the 1D
structure is a single crystal, or at least approaches single-crystal character fairly closely. "Tube" of course
implies a hollow center. "Nanowire" is perhaps the most troublesome. To some of us the term "nanowire"
implies that the electrical-transport measurements have been made, and the 1D structures have been
found to be either semiconductors or metallic conductors. To others, the term "nanowire" is used in much
the same way as "nanofiber." So you can see, standard definitions have not yet been fully developed.
Nanotubes may also be considered to be "nanowires." Nanowires must not necessarily be fully dense as
our's are; they could be hollow，